On Fri, Aug 23, 2024 at 9:55 AM Mariam Arutunian
<mariamarutun...@gmail.com> wrote:
>
>
> On Wed, Aug 21, 2024 at 5:56 PM Richard Sandiford <richard.sandif...@arm.com>
> wrote:
>>
>> Mariam Arutunian <mariamarutun...@gmail.com> writes:
>> > This patch introduces two new expanders for the aarch64 backend,
>> > dedicated to generate optimized code for CRC computations.
>> > The new expanders are designed to leverage specific hardware capabilities
>> > to achieve faster CRC calculations,
>> > particularly using the crc32, crc32c and pmull instructions when supported
>> > by the target architecture.
>> >
>> > Expander 1: Bit-Forward CRC (crc<ALLI:mode><ALLX:mode>4)
>> > For targets that support pmul instruction (TARGET_AES),
>> > the expander will generate code that uses the pmull (crypto_pmulldi)
>> > instruction for CRC computation.
>> >
>> > Expander 2: Bit-Reversed CRC (crc_rev<ALLI:mode><ALLX:mode>4)
>> > The expander first checks if the target supports the CRC32* instruction set
>> > (TARGET_CRC32)
>> > and the polynomial in use is 0x1EDC6F41 (iSCSI) or 0x04C11DB7 (HDLC). If
>> > the conditions are met,
>> > it emits calls to the corresponding crc32* instruction (depending on the
>> > data size and the polynomial).
>> > If the target does not support crc32* but supports pmull, it then uses the
>> > pmull (crypto_pmulldi) instruction for bit-reversed CRC computation.
>> > Otherwise table-based CRC is generated.
>> >
>> > gcc/config/aarch64/
>> >
>> > * aarch64-protos.h (aarch64_expand_crc_using_pmull): New extern
>> > function declaration.
>> > (aarch64_expand_reversed_crc_using_pmull): Likewise.
>> > * aarch64.cc (aarch64_expand_crc_using_pmull): New function.
>> > (aarch64_expand_reversed_crc_using_pmull): Likewise.
>> > * aarch64.md (crc_rev<ALLI:mode><ALLX:mode>4): New expander for
>> > reversed CRC.
>> > (crc<ALLI:mode><ALLX:mode>4): New expander for bit-forward CRC.
>> > * iterators.md (crc_data_type): New mode attribute.
>> >
>> > gcc/testsuite/gcc.target/aarch64/
>> >
>> > * crc-1-pmul.c: New test.
>> > * crc-10-pmul.c: Likewise.
>> > * crc-12-pmul.c: Likewise.
>> > * crc-13-pmul.c: Likewise.
>> > * crc-14-pmul.c: Likewise.
>> > * crc-17-pmul.c: Likewise.
>> > * crc-18-pmul.c: Likewise.
>> > * crc-21-pmul.c: Likewise.
>> > * crc-22-pmul.c: Likewise.
>> > * crc-23-pmul.c: Likewise.
>> > * crc-4-pmul.c: Likewise.
>> > * crc-5-pmul.c: Likewise.
>> > * crc-6-pmul.c: Likewise.
>> > * crc-7-pmul.c: Likewise.
>> > * crc-8-pmul.c: Likewise.
>> > * crc-9-pmul.c: Likewise.
>> > * crc-CCIT-data16-pmul.c: Likewise.
>> > * crc-CCIT-data8-pmul.c: Likewise.
>> > * crc-coremark-16bitdata-pmul.c: Likewise.
>> > * crc-crc32-data16.c: Likewise.
>> > * crc-crc32-data32.c: Likewise.
>> > * crc-crc32-data8.c: Likewise.
>> > * crc-crc32c-data16.c: Likewise.
>> > * crc-crc32c-data32.c: Likewise.
>> > * crc-crc32c-data8.c: Likewise.
>>
>> OK for trunk once the prerequisites are approved. Thanks for all your
>> work on this.
>>
>> Which other parts of the series still need review? I can try to help
>> out with the target-independent bits. (That said, I'm not sure I'm the
>> best person to review the tree recognition pass, but I can have a go.)
>>
>
> Thank you very much for everything.
> Right now, I'm not sure which parts would be best to be reviewed since
> Richard Biener is currently reviewing them.
> Maybe I can ask for your help later?
I'm done with the parts I preserved for reviewing. Btw, it seems the
vN series are not
complete, that is, you didn't re-post the entire series but only
changed parts? I was
somewhat confused by that.
Richard.
> Thanks,
> Mariam
>
>> Richard
>>
>> >
>> > Signed-off-by: Mariam Arutunian <mariamarutun...@gmail.com>
>> > Co-authored-by: Richard Sandiford <richard.sandif...@arm.com>
>> > diff --git a/gcc/config/aarch64/aarch64-protos.h
>> > b/gcc/config/aarch64/aarch64-protos.h
>> > index 42639e9efcf..469111e3b17 100644
>> > --- a/gcc/config/aarch64/aarch64-protos.h
>> > +++ b/gcc/config/aarch64/aarch64-protos.h
>> > @@ -1112,5 +1112,8 @@ extern void aarch64_adjust_reg_alloc_order ();
>> >
>> > bool aarch64_optimize_mode_switching (aarch64_mode_entity);
>> > void aarch64_restore_za (rtx);
>> > +void aarch64_expand_crc_using_pmull (scalar_mode, scalar_mode, rtx *);
>> > +void aarch64_expand_reversed_crc_using_pmull (scalar_mode, scalar_mode,
>> > rtx *);
>> > +
>> >
>> > #endif /* GCC_AARCH64_PROTOS_H */
>> > diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc
>> > index 7f0cc47d0f0..0cb8f3e8090 100644
>> > --- a/gcc/config/aarch64/aarch64.cc
>> > +++ b/gcc/config/aarch64/aarch64.cc
>> > @@ -30314,6 +30314,137 @@ aarch64_retrieve_sysreg (const char *regname,
>> > bool write_p, bool is128op)
>> > return sysreg->encoding;
>> > }
>> >
>> > +/* Generate assembly to calculate CRC
>> > + using carry-less multiplication instruction.
>> > + OPERANDS[1] is input CRC,
>> > + OPERANDS[2] is data (message),
>> > + OPERANDS[3] is the polynomial without the leading 1. */
>> > +
>> > +void
>> > +aarch64_expand_crc_using_pmull (scalar_mode crc_mode,
>> > + scalar_mode data_mode,
>> > + rtx *operands)
>> > +{
>> > + /* Check and keep arguments. */
>> > + gcc_assert (!CONST_INT_P (operands[0]));
>> > + gcc_assert (CONST_INT_P (operands[3]));
>> > + rtx crc = operands[1];
>> > + rtx data = operands[2];
>> > + rtx polynomial = operands[3];
>> > +
>> > + unsigned HOST_WIDE_INT crc_size = GET_MODE_BITSIZE (crc_mode);
>> > + unsigned HOST_WIDE_INT data_size = GET_MODE_BITSIZE (data_mode);
>> > + gcc_assert (crc_size <= 32);
>> > + gcc_assert (data_size <= crc_size);
>> > +
>> > + /* Calculate the quotient. */
>> > + unsigned HOST_WIDE_INT
>> > + q = gf2n_poly_long_div_quotient (UINTVAL (polynomial), crc_size);
>> > + /* CRC calculation's main part. */
>> > + if (crc_size > data_size)
>> > + crc = expand_shift (RSHIFT_EXPR, DImode, crc, crc_size - data_size,
>> > + NULL_RTX, 1);
>> > +
>> > + rtx t0 = force_reg (DImode, gen_int_mode (q, DImode));
>> > + polynomial = simplify_gen_unary (ZERO_EXTEND, DImode, polynomial,
>> > + GET_MODE (polynomial));
>> > + rtx t1 = force_reg (DImode, polynomial);
>> > +
>> > + rtx a0 = expand_binop (DImode, xor_optab, crc, data, NULL_RTX, 1,
>> > + OPTAB_WIDEN);
>> > +
>> > + rtx pmull_res = gen_reg_rtx (TImode);
>> > + emit_insn (gen_aarch64_crypto_pmulldi (pmull_res, a0, t0));
>> > + a0 = gen_lowpart (DImode, pmull_res);
>> > +
>> > + a0 = expand_shift (RSHIFT_EXPR, DImode, a0, crc_size, NULL_RTX, 1);
>> > +
>> > + emit_insn (gen_aarch64_crypto_pmulldi (pmull_res, a0, t1));
>> > + a0 = gen_lowpart (DImode, pmull_res);
>> > +
>> > + if (crc_size > data_size)
>> > + {
>> > + rtx crc_part = expand_shift (LSHIFT_EXPR, DImode, operands[1],
>> > data_size,
>> > + NULL_RTX, 0);
>> > + a0 = expand_binop (DImode, xor_optab, a0, crc_part, NULL_RTX, 1,
>> > + OPTAB_DIRECT);
>> > + }
>> > +
>> > + aarch64_emit_move (operands[0], gen_lowpart (crc_mode, a0));
>> > +}
>> > +
>> > +/* Generate assembly to calculate reversed CRC
>> > + using carry-less multiplication instruction.
>> > + OPERANDS[1] is input CRC,
>> > + OPERANDS[2] is data,
>> > + OPERANDS[3] is the polynomial without the leading 1. */
>> > +
>> > +void
>> > +aarch64_expand_reversed_crc_using_pmull (scalar_mode crc_mode,
>> > + scalar_mode data_mode,
>> > + rtx *operands)
>> > +{
>> > + /* Check and keep arguments. */
>> > + gcc_assert (!CONST_INT_P (operands[0]));
>> > + gcc_assert (CONST_INT_P (operands[3]));
>> > + rtx crc = operands[1];
>> > + rtx data = operands[2];
>> > + rtx polynomial = operands[3];
>> > +
>> > + unsigned HOST_WIDE_INT crc_size = GET_MODE_BITSIZE (crc_mode);
>> > + unsigned HOST_WIDE_INT data_size = GET_MODE_BITSIZE (data_mode);
>> > + gcc_assert (crc_size <= 32);
>> > + gcc_assert (data_size <= crc_size);
>> > +
>> > + /* Calculate the quotient. */
>> > + unsigned HOST_WIDE_INT
>> > + q = gf2n_poly_long_div_quotient (UINTVAL (polynomial), crc_size);
>> > + /* Reflect the calculated quotient. */
>> > + q = reflect_hwi (q, crc_size + 1);
>> > + rtx t0 = force_reg (DImode, gen_int_mode (q, DImode));
>> > +
>> > + /* Reflect the polynomial. */
>> > + unsigned HOST_WIDE_INT ref_polynomial = reflect_hwi (UINTVAL
>> > (polynomial),
>> > + crc_size);
>> > + /* An unshifted multiplier would require the final result to be
>> > extracted
>> > + using a shift right by DATA_SIZE - 1 bits. Shift the multiplier left
>> > + so that the shift right can be by CRC_SIZE bits instead. */
>> > + ref_polynomial <<= crc_size - data_size + 1;
>> > + rtx t1 = force_reg (DImode, gen_int_mode (ref_polynomial, DImode));
>> > +
>> > + /* CRC calculation's main part. */
>> > + rtx a0 = expand_binop (DImode, xor_optab, crc, data, NULL_RTX, 1,
>> > + OPTAB_WIDEN);
>> > +
>> > + /* Perform carry-less multiplication and get low part. */
>> > + rtx pmull_res = gen_reg_rtx (TImode);
>> > + emit_insn (gen_aarch64_crypto_pmulldi (pmull_res, a0, t0));
>> > + a0 = gen_lowpart (DImode, pmull_res);
>> > +
>> > + a0 = expand_binop (DImode, and_optab, a0,
>> > + gen_int_mode (GET_MODE_MASK (data_mode), DImode),
>> > + NULL_RTX, 1, OPTAB_WIDEN);
>> > +
>> > + /* Perform carry-less multiplication. */
>> > + emit_insn (gen_aarch64_crypto_pmulldi (pmull_res, a0, t1));
>> > +
>> > + /* Perform a shift right by CRC_SIZE as an extraction of lane 1. */
>> > + machine_mode crc_vmode = aarch64_vq_mode (crc_mode).require ();
>> > + a0 = (crc_size > data_size ? gen_reg_rtx (crc_mode) : operands[0]);
>> > + emit_insn (gen_aarch64_get_lane (crc_vmode, a0,
>> > + gen_lowpart (crc_vmode, pmull_res),
>> > + aarch64_endian_lane_rtx (crc_vmode, 1)));
>> > +
>> > + if (crc_size > data_size)
>> > + {
>> > + rtx crc_part = expand_shift (RSHIFT_EXPR, crc_mode, crc, data_size,
>> > + NULL_RTX, 1);
>> > + a0 = expand_binop (crc_mode, xor_optab, a0, crc_part, operands[0],
>> > 1,
>> > + OPTAB_WIDEN);
>> > + aarch64_emit_move (operands[0], a0);
>> > + }
>> > +}
>> > +
>> > /* Target-specific selftests. */
>> >
>> > #if CHECKING_P
>> > diff --git a/gcc/config/aarch64/aarch64.md b/gcc/config/aarch64/aarch64.md
>> > index 9de6235b139..bdb93ccaf76 100644
>> > --- a/gcc/config/aarch64/aarch64.md
>> > +++ b/gcc/config/aarch64/aarch64.md
>> > @@ -4556,6 +4556,63 @@
>> > [(set_attr "type" "crc")]
>> > )
>> >
>> > +;; Reversed CRC
>> > +(define_expand "crc_rev<ALLI:mode><ALLX:mode>4"
>> > + [;; return value (calculated CRC)
>> > + (match_operand:ALLX 0 "register_operand" "=r")
>> > + ;; initial CRC
>> > + (match_operand:ALLX 1 "register_operand" "r")
>> > + ;; data
>> > + (match_operand:ALLI 2 "register_operand" "r")
>> > + ;; polynomial without leading 1
>> > + (match_operand:ALLX 3)]
>> > + ""
>> > + {
>> > + /* If the polynomial is the same as the polynomial of crc32c*
>> > instruction,
>> > + put that instruction. crc32c uses iSCSI polynomial. */
>> > + if (TARGET_CRC32 && INTVAL (operands[3]) == 0x1EDC6F41
>> > + && <ALLX:MODE>mode == SImode)
>> > + emit_insn (gen_aarch64_crc32c<ALLI:crc_data_type> (operands[0],
>> > + operands[1],
>> > + operands[2]));
>> > + /* If the polynomial is the same as the polynomial of crc32*
>> > instruction,
>> > + put that instruction. crc32 uses HDLC etc. polynomial. */
>> > + else if (TARGET_CRC32 && INTVAL (operands[3]) == 0x04C11DB7
>> > + && <ALLX:MODE>mode == SImode)
>> > + emit_insn (gen_aarch64_crc32<ALLI:crc_data_type> (operands[0],
>> > + operands[1],
>> > + operands[2]));
>> > + else if (TARGET_AES && <ALLI:sizen> <= <ALLX:sizen>)
>> > + aarch64_expand_reversed_crc_using_pmull (<ALLX:MODE>mode,
>> > + <ALLI:MODE>mode,
>> > + operands);
>> > + else
>> > + /* Otherwise, generate table-based CRC. */
>> > + expand_reversed_crc_table_based (operands[0], operands[1],
>> > operands[2],
>> > + operands[3], <ALLI:MODE>mode,
>> > + generate_reflecting_code_standard);
>> > + DONE;
>> > + }
>> > +)
>> > +
>> > +;; Bit-forward CRC
>> > +(define_expand "crc<ALLI:mode><ALLX:mode>4"
>> > + [;; return value (calculated CRC)
>> > + (match_operand:ALLX 0 "register_operand" "=r")
>> > + ;; initial CRC
>> > + (match_operand:ALLX 1 "register_operand" "r")
>> > + ;; data
>> > + (match_operand:ALLI 2 "register_operand" "r")
>> > + ;; polynomial without leading 1
>> > + (match_operand:ALLX 3)]
>> > + "TARGET_AES && <ALLI:sizen> <= <ALLX:sizen>"
>> > + {
>> > + aarch64_expand_crc_using_pmull (<ALLX:MODE>mode, <ALLI:MODE>mode,
>> > + operands);
>> > + DONE;
>> > + }
>> > +)
>> > +
>> > (define_insn "*csinc2<mode>_insn"
>> > [(set (match_operand:GPI 0 "register_operand" "=r")
>> > (plus:GPI (match_operand 2 "aarch64_comparison_operation" "")
>> > diff --git a/gcc/config/aarch64/iterators.md
>> > b/gcc/config/aarch64/iterators.md
>> > index f527b2cfeb8..8faba9025ce 100644
>> > --- a/gcc/config/aarch64/iterators.md
>> > +++ b/gcc/config/aarch64/iterators.md
>> > @@ -1276,6 +1276,10 @@
>> > ;; Map a mode to a specific constraint character.
>> > (define_mode_attr cmode [(QI "q") (HI "h") (SI "s") (DI "d")])
>> >
>> > +;; Map a mode to a specific constraint character for calling
>> > +;; appropriate version of crc.
>> > +(define_mode_attr crc_data_type [(QI "b") (HI "h") (SI "w") (DI "x")])
>> > +
>> > ;; Map modes to Usg and Usj constraints for SISD right shifts
>> > (define_mode_attr cmode_simd [(SI "g") (DI "j")])
>> >
>> > diff --git a/gcc/testsuite/gcc.target/aarch64/crc-1-pmul.c
>> > b/gcc/testsuite/gcc.target/aarch64/crc-1-pmul.c
>> > new file mode 100644
>> > index 00000000000..4043251dbd8
>> > --- /dev/null
>> > +++ b/gcc/testsuite/gcc.target/aarch64/crc-1-pmul.c
>> > @@ -0,0 +1,8 @@
>> > +/* { dg-do run } */
>> > +/* { dg-options "-march=armv8-a+crypto -O2 -fdump-rtl-dfinish
>> > -fdump-tree-crc -fdisable-tree-phiopt2 -fdisable-tree-phiopt3" } */
>> > +
>> > +#include "../../gcc.dg/torture/crc-1.c"
>> > +
>> > +/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
>> > +/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code."
>> > 0 "crc"} } */
>> > +/* { dg-final { scan-rtl-dump "pmull" "dfinish"} } */
>> > \ No newline at end of file
>> > diff --git a/gcc/testsuite/gcc.target/aarch64/crc-10-pmul.c
>> > b/gcc/testsuite/gcc.target/aarch64/crc-10-pmul.c
>> > new file mode 100644
>> > index 00000000000..dd866b38e83
>> > --- /dev/null
>> > +++ b/gcc/testsuite/gcc.target/aarch64/crc-10-pmul.c
>> > @@ -0,0 +1,9 @@
>> > +/* { dg-do run } */
>> > +/* { dg-options "-march=armv8-a+crypto -O2 -fdump-rtl-dfinish
>> > -fdump-tree-crc" } */
>> > +/* { dg-skip-if "" { *-*-* } { "-flto"} } */
>> > +
>> > +#include "../../gcc.dg/torture/crc-10.c"
>> > +
>> > +/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
>> > +/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code."
>> > 0 "crc"} } */
>> > +/* { dg-final { scan-rtl-dump "pmull" "dfinish"} } */
>> > diff --git a/gcc/testsuite/gcc.target/aarch64/crc-12-pmul.c
>> > b/gcc/testsuite/gcc.target/aarch64/crc-12-pmul.c
>> > new file mode 100644
>> > index 00000000000..16d901eeaef
>> > --- /dev/null
>> > +++ b/gcc/testsuite/gcc.target/aarch64/crc-12-pmul.c
>> > @@ -0,0 +1,9 @@
>> > +/* { dg-do run } */
>> > +/* { dg-options "-march=armv8-a+crypto -O2 -fdump-rtl-dfinish
>> > -fdump-tree-crc -fdisable-tree-phiopt2 -fdisable-tree-phiopt3" } */
>> > +/* { dg-skip-if "" { *-*-* } { "-flto"} } */
>> > +
>> > +#include "../../gcc.dg/torture/crc-12.c"
>> > +
>> > +/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
>> > +/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code."
>> > 0 "crc"} } */
>> > +/* { dg-final { scan-rtl-dump "pmull" "dfinish"} } */
>> > diff --git a/gcc/testsuite/gcc.target/aarch64/crc-13-pmul.c
>> > b/gcc/testsuite/gcc.target/aarch64/crc-13-pmul.c
>> > new file mode 100644
>> > index 00000000000..5f7741fad0f
>> > --- /dev/null
>> > +++ b/gcc/testsuite/gcc.target/aarch64/crc-13-pmul.c
>> > @@ -0,0 +1,9 @@
>> > +/* { dg-do run } */
>> > +/* { dg-options "-march=armv8-a+crypto -O2 -fdump-rtl-dfinish
>> > -fdump-tree-crc" } */
>> > +/* { dg-skip-if "" { *-*-* } { "-flto"} } */
>> > +
>> > +#include "../../gcc.dg/torture/crc-13.c"
>> > +
>> > +/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
>> > +/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code."
>> > 0 "crc"} } */
>> > +/* { dg-final { scan-rtl-dump "pmull" "dfinish"} } */
>> > diff --git a/gcc/testsuite/gcc.target/aarch64/crc-14-pmul.c
>> > b/gcc/testsuite/gcc.target/aarch64/crc-14-pmul.c
>> > new file mode 100644
>> > index 00000000000..cdedbbd3db1
>> > --- /dev/null
>> > +++ b/gcc/testsuite/gcc.target/aarch64/crc-14-pmul.c
>> > @@ -0,0 +1,9 @@
>> > +/* { dg-do run } */
>> > +/* { dg-options "-march=armv8-a+crypto -O2 -fdump-rtl-dfinish
>> > -fdump-tree-crc" } */
>> > +/* { dg-skip-if "" { *-*-* } { "-flto"} } */
>> > +
>> > +#include "../../gcc.dg/torture/crc-14.c"
>> > +
>> > +/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
>> > +/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code."
>> > 0 "crc"} } */
>> > +/* { dg-final { scan-rtl-dump "pmull" "dfinish"} } */
>> > diff --git a/gcc/testsuite/gcc.target/aarch64/crc-17-pmul.c
>> > b/gcc/testsuite/gcc.target/aarch64/crc-17-pmul.c
>> > new file mode 100644
>> > index 00000000000..c219e49a2b1
>> > --- /dev/null
>> > +++ b/gcc/testsuite/gcc.target/aarch64/crc-17-pmul.c
>> > @@ -0,0 +1,9 @@
>> > +/* { dg-do run } */
>> > +/* { dg-options "-march=armv8-a+crypto -O2 -fdump-rtl-dfinish
>> > -fdump-tree-crc" } */
>> > +/* { dg-skip-if "" { *-*-* } { "-flto"} } */
>> > +
>> > +#include "../../gcc.dg/torture/crc-17.c"
>> > +
>> > +/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
>> > +/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code."
>> > 0 "crc"} } */
>> > +/* { dg-final { scan-rtl-dump "pmull" "dfinish"} } */
>> > diff --git a/gcc/testsuite/gcc.target/aarch64/crc-18-pmul.c
>> > b/gcc/testsuite/gcc.target/aarch64/crc-18-pmul.c
>> > new file mode 100644
>> > index 00000000000..124900a979b
>> > --- /dev/null
>> > +++ b/gcc/testsuite/gcc.target/aarch64/crc-18-pmul.c
>> > @@ -0,0 +1,9 @@
>> > +/* { dg-do run } */
>> > +/* { dg-options "-march=armv8-a+crypto -O2 -fdump-rtl-dfinish
>> > -fdump-tree-crc" } */
>> > +/* { dg-skip-if "" { *-*-* } { "-flto"} } */
>> > +
>> > +#include "../../gcc.dg/torture/crc-18.c"
>> > +
>> > +/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
>> > +/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code."
>> > 0 "crc"} } */
>> > +/* { dg-final { scan-rtl-dump "pmull" "dfinish"} } */
>> > diff --git a/gcc/testsuite/gcc.target/aarch64/crc-21-pmul.c
>> > b/gcc/testsuite/gcc.target/aarch64/crc-21-pmul.c
>> > new file mode 100644
>> > index 00000000000..3cae1a7f57b
>> > --- /dev/null
>> > +++ b/gcc/testsuite/gcc.target/aarch64/crc-21-pmul.c
>> > @@ -0,0 +1,9 @@
>> > +/* { dg-do run } */
>> > +/* { dg-options "-march=armv8-a+crypto -O2 -fdump-rtl-dfinish
>> > -fdump-tree-crc" } */
>> > +/* { dg-skip-if "" { *-*-* } { "-flto"} } */
>> > +
>> > +#include "../../gcc.dg/torture/crc-21.c"
>> > +
>> > +/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
>> > +/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code."
>> > 0 "crc"} } */
>> > +/* { dg-final { scan-rtl-dump "pmull" "dfinish"} } */
>> > diff --git a/gcc/testsuite/gcc.target/aarch64/crc-22-pmul.c
>> > b/gcc/testsuite/gcc.target/aarch64/crc-22-pmul.c
>> > new file mode 100644
>> > index 00000000000..0ec2e312f8f
>> > --- /dev/null
>> > +++ b/gcc/testsuite/gcc.target/aarch64/crc-22-pmul.c
>> > @@ -0,0 +1,9 @@
>> > +/* { dg-do run } */
>> > +/* { dg-options "-march=armv8-a+crypto -O2 -fdump-rtl-dfinish
>> > -fdump-tree-crc" } */
>> > +/* { dg-skip-if "" { *-*-* } { "-flto"} } */
>> > +
>> > +#include "../../gcc.dg/torture/crc-22.c"
>> > +
>> > +/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
>> > +/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code."
>> > 0 "crc"} } */
>> > +/* { dg-final { scan-rtl-dump "pmull" "dfinish"} } */
>> > diff --git a/gcc/testsuite/gcc.target/aarch64/crc-23-pmul.c
>> > b/gcc/testsuite/gcc.target/aarch64/crc-23-pmul.c
>> > new file mode 100644
>> > index 00000000000..0c4542adb40
>> > --- /dev/null
>> > +++ b/gcc/testsuite/gcc.target/aarch64/crc-23-pmul.c
>> > @@ -0,0 +1,9 @@
>> > +/* { dg-do run } */
>> > +/* { dg-options "-march=armv8-a+crypto -O2 -fdump-rtl-dfinish
>> > -fdump-tree-crc" } */
>> > +/* { dg-skip-if "" { *-*-* } { "-flto"} } */
>> > +
>> > +#include "../../gcc.dg/torture/crc-23.c"
>> > +
>> > +/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
>> > +/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code."
>> > 0 "crc"} } */
>> > +/* { dg-final { scan-rtl-dump "pmull" "dfinish"} } */
>> > diff --git a/gcc/testsuite/gcc.target/aarch64/crc-4-pmul.c
>> > b/gcc/testsuite/gcc.target/aarch64/crc-4-pmul.c
>> > new file mode 100644
>> > index 00000000000..08f1d3b69d7
>> > --- /dev/null
>> > +++ b/gcc/testsuite/gcc.target/aarch64/crc-4-pmul.c
>> > @@ -0,0 +1,9 @@
>> > +/* { dg-do run } */
>> > +/* { dg-options "-march=armv8-a+crypto -O2 -fdump-rtl-dfinish
>> > -fdump-tree-crc" } */
>> > +/* { dg-skip-if "" { *-*-* } { "-flto"} } */
>> > +
>> > +#include "../../gcc.dg/torture/crc-4.c"
>> > +
>> > +/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
>> > +/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code."
>> > 0 "crc"} } */
>> > +/* { dg-final { scan-rtl-dump "pmull" "dfinish"} } */
>> > diff --git a/gcc/testsuite/gcc.target/aarch64/crc-5-pmul.c
>> > b/gcc/testsuite/gcc.target/aarch64/crc-5-pmul.c
>> > new file mode 100644
>> > index 00000000000..91bf5e6353d
>> > --- /dev/null
>> > +++ b/gcc/testsuite/gcc.target/aarch64/crc-5-pmul.c
>> > @@ -0,0 +1,9 @@
>> > +/* { dg-do run } */
>> > +/* { dg-options "-march=armv8-a+crypto -O2 -w -fdump-rtl-dfinish
>> > -fdump-tree-crc" } */
>> > +/* { dg-skip-if "" { *-*-* } { "-flto"} } */
>> > +
>> > +#include "../../gcc.dg/torture/crc-5.c"
>> > +
>> > +/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
>> > +/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code."
>> > 0 "crc"} } */
>> > +/* { dg-final { scan-rtl-dump "pmull" "dfinish"} } */
>> > \ No newline at end of file
>> > diff --git a/gcc/testsuite/gcc.target/aarch64/crc-6-pmul.c
>> > b/gcc/testsuite/gcc.target/aarch64/crc-6-pmul.c
>> > new file mode 100644
>> > index 00000000000..4680eafe758
>> > --- /dev/null
>> > +++ b/gcc/testsuite/gcc.target/aarch64/crc-6-pmul.c
>> > @@ -0,0 +1,9 @@
>> > +/* { dg-do run } */
>> > +/* { dg-options "-march=armv8-a+crypto -O2 -fdump-rtl-dfinish
>> > -fdump-tree-crc" } */
>> > +/* { dg-skip-if "" { *-*-* } { "-flto"} } */
>> > +
>> > +#include "../../gcc.dg/torture/crc-6.c"
>> > +
>> > +/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
>> > +/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code."
>> > 0 "crc"} } */
>> > +/* { dg-final { scan-rtl-dump "pmull" "dfinish"} } */
>> > \ No newline at end of file
>> > diff --git a/gcc/testsuite/gcc.target/aarch64/crc-7-pmul.c
>> > b/gcc/testsuite/gcc.target/aarch64/crc-7-pmul.c
>> > new file mode 100644
>> > index 00000000000..655484d10d4
>> > --- /dev/null
>> > +++ b/gcc/testsuite/gcc.target/aarch64/crc-7-pmul.c
>> > @@ -0,0 +1,9 @@
>> > +/* { dg-do run } */
>> > +/* { dg-options "-march=armv8-a+crypto -O2 -fdump-rtl-dfinish
>> > -fdump-tree-crc" } */
>> > +/* { dg-skip-if "" { *-*-* } { "-flto"} } */
>> > +
>> > +#include "../../gcc.dg/torture/crc-7.c"
>> > +
>> > +/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
>> > +/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code."
>> > 0 "crc"} } */
>> > +/* { dg-final { scan-rtl-dump "pmull" "dfinish"} } */
>> > diff --git a/gcc/testsuite/gcc.target/aarch64/crc-8-pmul.c
>> > b/gcc/testsuite/gcc.target/aarch64/crc-8-pmul.c
>> > new file mode 100644
>> > index 00000000000..6c2acc84c32
>> > --- /dev/null
>> > +++ b/gcc/testsuite/gcc.target/aarch64/crc-8-pmul.c
>> > @@ -0,0 +1,9 @@
>> > +/* { dg-do run } */
>> > +/* { dg-options "-march=armv8-a+crypto -O2 -fdump-rtl-dfinish
>> > -fdump-tree-crc" } */
>> > +/* { dg-skip-if "" { *-*-* } { "-flto"} } */
>> > +
>> > +#include "../../gcc.dg/torture/crc-8.c"
>> > +
>> > +/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
>> > +/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code."
>> > 0 "crc"} } */
>> > +/* { dg-final { scan-rtl-dump "pmull" "dfinish"} } */
>> > diff --git a/gcc/testsuite/gcc.target/aarch64/crc-9-pmul.c
>> > b/gcc/testsuite/gcc.target/aarch64/crc-9-pmul.c
>> > new file mode 100644
>> > index 00000000000..e76f3c77b59
>> > --- /dev/null
>> > +++ b/gcc/testsuite/gcc.target/aarch64/crc-9-pmul.c
>> > @@ -0,0 +1,9 @@
>> > +/* { dg-do run } */
>> > +/* { dg-options "-march=armv8-a+crypto -O2 -fdump-rtl-dfinish
>> > -fdump-tree-crc" } */
>> > +/* { dg-skip-if "" { *-*-* } { "-flto"} } */
>> > +
>> > +#include "../../gcc.dg/torture/crc-9.c"
>> > +
>> > +/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
>> > +/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code."
>> > 0 "crc"} } */
>> > +/* { dg-final { scan-rtl-dump "pmull" "dfinish"} } */
>> > diff --git a/gcc/testsuite/gcc.target/aarch64/crc-CCIT-data16-pmul.c
>> > b/gcc/testsuite/gcc.target/aarch64/crc-CCIT-data16-pmul.c
>> > new file mode 100644
>> > index 00000000000..21520474564
>> > --- /dev/null
>> > +++ b/gcc/testsuite/gcc.target/aarch64/crc-CCIT-data16-pmul.c
>> > @@ -0,0 +1,9 @@
>> > +/* { dg-do run } */
>> > +/* { dg-options "-w -march=armv8-a+crypto -O2 -fdump-rtl-dfinish
>> > -fdump-tree-crc" } */
>> > +/* { dg-skip-if "" { *-*-* } { "-flto"} } */
>> > +
>> > +#include "../../gcc.dg/torture/crc-CCIT-data16.c"
>> > +
>> > +/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
>> > +/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code."
>> > 0 "crc"} } */
>> > +/* { dg-final { scan-rtl-dump "pmull" "dfinish"} } */
>> > \ No newline at end of file
>> > diff --git a/gcc/testsuite/gcc.target/aarch64/crc-CCIT-data8-pmul.c
>> > b/gcc/testsuite/gcc.target/aarch64/crc-CCIT-data8-pmul.c
>> > new file mode 100644
>> > index 00000000000..3dcc92320f3
>> > --- /dev/null
>> > +++ b/gcc/testsuite/gcc.target/aarch64/crc-CCIT-data8-pmul.c
>> > @@ -0,0 +1,9 @@
>> > +/* { dg-do run } */
>> > +/* { dg-options "-w -march=armv8-a+crypto -O2 -fdump-rtl-dfinish
>> > -fdump-tree-crc" } */
>> > +/* { dg-skip-if "" { *-*-* } { "-flto" } } */
>> > +
>> > +#include "../../gcc.dg/torture/crc-CCIT-data8.c"
>> > +
>> > +/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
>> > +/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code."
>> > 0 "crc"} } */
>> > +/* { dg-final { scan-rtl-dump "pmull" "dfinish"} } */
>> > \ No newline at end of file
>> > diff --git
>> > a/gcc/testsuite/gcc.target/aarch64/crc-coremark-16bitdata-pmul.c
>> > b/gcc/testsuite/gcc.target/aarch64/crc-coremark-16bitdata-pmul.c
>> > new file mode 100644
>> > index 00000000000..e5196aaafef
>> > --- /dev/null
>> > +++ b/gcc/testsuite/gcc.target/aarch64/crc-coremark-16bitdata-pmul.c
>> > @@ -0,0 +1,9 @@
>> > +/* { dg-do run } */
>> > +/* { dg-options "-w -march=armv8-a+crypto -O2 -fdump-rtl-dfinish
>> > -fdump-tree-crc" } */
>> > +/* { dg-skip-if "" { *-*-* } { "-flto"} } */
>> > +
>> > +#include "../../gcc.dg/torture/crc-coremark16-data16.c"
>> > +
>> > +/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
>> > +/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code."
>> > 0 "crc"} } */
>> > +/* { dg-final { scan-rtl-dump "pmull" "dfinish"} } */
>> > \ No newline at end of file
>> > diff --git a/gcc/testsuite/gcc.target/aarch64/crc-crc32-data16.c
>> > b/gcc/testsuite/gcc.target/aarch64/crc-crc32-data16.c
>> > new file mode 100644
>> > index 00000000000..e82cb04fcc3
>> > --- /dev/null
>> > +++ b/gcc/testsuite/gcc.target/aarch64/crc-crc32-data16.c
>> > @@ -0,0 +1,53 @@
>> > +/* { dg-do run } */
>> > +/* { dg-options "-march=armv8-a+crc -O2 -fdump-rtl-dfinish
>> > -fdump-tree-crc" } */
>> > +/* { dg-skip-if "" { *-*-* } { "-flto"} } */
>> > +
>> > +#include <stdint.h>
>> > +#include <stdlib.h>
>> > +
>> > +__attribute__ ((noinline,optimize(0)))
>> > +uint32_t _crc32_O0 (uint32_t crc, uint16_t data) {
>> > + int i;
>> > + crc = crc ^ data;
>> > +
>> > + for (i = 0; i < 8; i++) {
>> > + if (crc & 1)
>> > + crc = (crc >> 1) ^ 0xEDB88320;
>> > + else
>> > + crc = (crc >> 1);
>> > + }
>> > +
>> > + return crc;
>> > +}
>> > +
>> > +uint32_t _crc32 (uint32_t crc, uint16_t data) {
>> > + int i;
>> > + crc = crc ^ data;
>> > +
>> > + for (i = 0; i < 8; i++) {
>> > + if (crc & 1)
>> > + crc = (crc >> 1) ^ 0xEDB88320;
>> > + else
>> > + crc = (crc >> 1);
>> > + }
>> > +
>> > + return crc;
>> > +}
>> > +
>> > +int main ()
>> > +{
>> > + uint32_t crc = 0x0D800D80;
>> > + for (uint16_t i = 0; i < 0xffff; i++)
>> > + {
>> > + uint32_t res1 = _crc32_O0 (crc, i);
>> > + uint32_t res2 = _crc32 (crc, i);
>> > + if (res1 != res2)
>> > + abort ();
>> > + crc = res1;
>> > + }
>> > +}
>> > +
>> > +/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
>> > +/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code."
>> > 0 "crc"} } */
>> > +/* { dg-final { scan-rtl-dump "UNSPEC_CRC32" "dfinish"} } */
>> > +/* { dg-final { scan-rtl-dump-times "pmull" 0 "dfinish"} } */
>> > diff --git a/gcc/testsuite/gcc.target/aarch64/crc-crc32-data32.c
>> > b/gcc/testsuite/gcc.target/aarch64/crc-crc32-data32.c
>> > new file mode 100644
>> > index 00000000000..a7564a7e28a
>> > --- /dev/null
>> > +++ b/gcc/testsuite/gcc.target/aarch64/crc-crc32-data32.c
>> > @@ -0,0 +1,52 @@
>> > +/* { dg-do run } */
>> > +/* { dg-options "-march=armv8-a+crc -O2 -fdump-rtl-dfinish
>> > -fdump-tree-crc" } */
>> > +/* { dg-skip-if "" { *-*-* } { "-flto"} } */
>> > +
>> > +#include <stdint.h>
>> > +#include <stdlib.h>
>> > +__attribute__ ((noinline,optimize(0)))
>> > +uint32_t _crc32_O0 (uint32_t crc, uint32_t data) {
>> > + int i;
>> > + crc = crc ^ data;
>> > +
>> > + for (i = 0; i < 32; i++) {
>> > + if (crc & 1)
>> > + crc = (crc >> 1) ^ 0xEDB88320;
>> > + else
>> > + crc = (crc >> 1);
>> > + }
>> > +
>> > + return crc;
>> > +}
>> > +
>> > +uint32_t _crc32 (uint32_t crc, uint32_t data) {
>> > + int i;
>> > + crc = crc ^ data;
>> > +
>> > + for (i = 0; i < 32; i++) {
>> > + if (crc & 1)
>> > + crc = (crc >> 1) ^ 0xEDB88320;
>> > + else
>> > + crc = (crc >> 1);
>> > + }
>> > +
>> > + return crc;
>> > +}
>> > +
>> > +int main ()
>> > +{
>> > + uint32_t crc = 0x0D800D80;
>> > + for (uint8_t i = 0; i < 0xff; i++)
>> > + {
>> > + uint32_t res1 = _crc32_O0 (crc, i);
>> > + uint32_t res2 = _crc32 (crc, i);
>> > + if (res1 != res2)
>> > + abort ();
>> > + crc = res1;
>> > + }
>> > +}
>> > +
>> > +/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
>> > +/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code."
>> > 0 "crc"} } */
>> > +/* { dg-final { scan-rtl-dump "UNSPEC_CRC32" "dfinish"} } */
>> > +/* { dg-final { scan-rtl-dump-times "pmull" 0 "dfinish"} } */
>> > diff --git a/gcc/testsuite/gcc.target/aarch64/crc-crc32-data8.c
>> > b/gcc/testsuite/gcc.target/aarch64/crc-crc32-data8.c
>> > new file mode 100644
>> > index 00000000000..c88cafadedc
>> > --- /dev/null
>> > +++ b/gcc/testsuite/gcc.target/aarch64/crc-crc32-data8.c
>> > @@ -0,0 +1,53 @@
>> > +/* { dg-do run } */
>> > +/* { dg-options "-march=armv8-a+crc -O2 -fdump-rtl-dfinish
>> > -fdump-tree-crc" } */
>> > +/* { dg-skip-if "" { *-*-* } { "-flto"} } */
>> > +
>> > +#include <stdint.h>
>> > +#include <stdlib.h>
>> > +
>> > +__attribute__ ((noinline,optimize(0)))
>> > +uint32_t _crc32_O0 (uint32_t crc, uint8_t data) {
>> > + int i;
>> > + crc = crc ^ data;
>> > +
>> > + for (i = 0; i < 8; i++) {
>> > + if (crc & 1)
>> > + crc = (crc >> 1) ^ 0xEDB88320;
>> > + else
>> > + crc = (crc >> 1);
>> > + }
>> > +
>> > + return crc;
>> > +}
>> > +
>> > +uint32_t _crc32 (uint32_t crc, uint8_t data) {
>> > + int i;
>> > + crc = crc ^ data;
>> > +
>> > + for (i = 0; i < 8; i++) {
>> > + if (crc & 1)
>> > + crc = (crc >> 1) ^ 0xEDB88320;
>> > + else
>> > + crc = (crc >> 1);
>> > + }
>> > +
>> > + return crc;
>> > +}
>> > +
>> > +int main ()
>> > +{
>> > + uint32_t crc = 0x0D800D80;
>> > + for (uint8_t i = 0; i < 0xff; i++)
>> > + {
>> > + uint32_t res1 = _crc32_O0 (crc, i);
>> > + uint32_t res2 = _crc32 (crc, i);
>> > + if (res1 != res2)
>> > + abort ();
>> > + crc = res1;
>> > + }
>> > +}
>> > +
>> > +/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
>> > +/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code."
>> > 0 "crc"} } */
>> > +/* { dg-final { scan-rtl-dump "UNSPEC_CRC32" "dfinish"} } */
>> > +/* { dg-final { scan-rtl-dump-times "pmull" 0 "dfinish"} } */
>> > diff --git a/gcc/testsuite/gcc.target/aarch64/crc-crc32c-data16.c
>> > b/gcc/testsuite/gcc.target/aarch64/crc-crc32c-data16.c
>> > new file mode 100644
>> > index 00000000000..d82e6252603
>> > --- /dev/null
>> > +++ b/gcc/testsuite/gcc.target/aarch64/crc-crc32c-data16.c
>> > @@ -0,0 +1,53 @@
>> > +/* { dg-do run } */
>> > +/* { dg-options "-march=armv8-a+crc -O2 -fdump-rtl-dfinish
>> > -fdump-tree-crc" } */
>> > +/* { dg-skip-if "" { *-*-* } { "-flto"} } */
>> > +
>> > +#include <stdint.h>
>> > +#include <stdlib.h>
>> > +
>> > +__attribute__ ((noinline,optimize(0)))
>> > +uint32_t _crc32_O0 (uint32_t crc, uint16_t data) {
>> > + int i;
>> > + crc = crc ^ data;
>> > +
>> > + for (i = 0; i < 8; i++) {
>> > + if (crc & 1)
>> > + crc = (crc >> 1) ^ 0x82F63B78;
>> > + else
>> > + crc = (crc >> 1);
>> > + }
>> > +
>> > + return crc;
>> > +}
>> > +
>> > +uint32_t _crc32 (uint32_t crc, uint16_t data) {
>> > + int i;
>> > + crc = crc ^ data;
>> > +
>> > + for (i = 0; i < 8; i++) {
>> > + if (crc & 1)
>> > + crc = (crc >> 1) ^ 0x82F63B78;
>> > + else
>> > + crc = (crc >> 1);
>> > + }
>> > +
>> > + return crc;
>> > +}
>> > +
>> > +int main ()
>> > +{
>> > + uint32_t crc = 0x0D800D80;
>> > + for (uint16_t i = 0; i < 0xffff; i++)
>> > + {
>> > + uint32_t res1 = _crc32_O0 (crc, i);
>> > + uint32_t res2 = _crc32 (crc, i);
>> > + if (res1 != res2)
>> > + abort ();
>> > + crc = res1;
>> > + }
>> > +}
>> > +
>> > +/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
>> > +/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code."
>> > 0 "crc"} } */
>> > +/* { dg-final { scan-rtl-dump "UNSPEC_CRC32C" "dfinish"} } */
>> > +/* { dg-final { scan-rtl-dump-times "pmull" 0 "dfinish"} } */
>> > diff --git a/gcc/testsuite/gcc.target/aarch64/crc-crc32c-data32.c
>> > b/gcc/testsuite/gcc.target/aarch64/crc-crc32c-data32.c
>> > new file mode 100644
>> > index 00000000000..7acb6fc239c
>> > --- /dev/null
>> > +++ b/gcc/testsuite/gcc.target/aarch64/crc-crc32c-data32.c
>> > @@ -0,0 +1,52 @@
>> > +/* { dg-do run } */
>> > +/* { dg-options "-march=armv8-a+crc -O2 -fdump-rtl-dfinish
>> > -fdump-tree-crc" } */
>> > +/* { dg-skip-if "" { *-*-* } { "-flto"} } */
>> > +
>> > +#include <stdint.h>
>> > +#include <stdlib.h>
>> > +__attribute__ ((noinline,optimize(0)))
>> > +uint32_t _crc32_O0 (uint32_t crc, uint32_t data) {
>> > + int i;
>> > + crc = crc ^ data;
>> > +
>> > + for (i = 0; i < 32; i++) {
>> > + if (crc & 1)
>> > + crc = (crc >> 1) ^ 0x82F63B78;
>> > + else
>> > + crc = (crc >> 1);
>> > + }
>> > +
>> > + return crc;
>> > +}
>> > +
>> > +uint32_t _crc32 (uint32_t crc, uint32_t data) {
>> > + int i;
>> > + crc = crc ^ data;
>> > +
>> > + for (i = 0; i < 32; i++) {
>> > + if (crc & 1)
>> > + crc = (crc >> 1) ^ 0x82F63B78;
>> > + else
>> > + crc = (crc >> 1);
>> > + }
>> > +
>> > + return crc;
>> > +}
>> > +
>> > +int main ()
>> > +{
>> > + uint32_t crc = 0x0D800D80;
>> > + for (uint8_t i = 0; i < 0xff; i++)
>> > + {
>> > + uint32_t res1 = _crc32_O0 (crc, i);
>> > + uint32_t res2 = _crc32 (crc, i);
>> > + if (res1 != res2)
>> > + abort ();
>> > + crc = res1;
>> > + }
>> > +}
>> > +
>> > +/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
>> > +/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code."
>> > 0 "crc"} } */
>> > +/* { dg-final { scan-rtl-dump "UNSPEC_CRC32C" "dfinish"} } */
>> > +/* { dg-final { scan-rtl-dump-times "pmull" 0 "dfinish"} } */
>> > diff --git a/gcc/testsuite/gcc.target/aarch64/crc-crc32c-data8.c
>> > b/gcc/testsuite/gcc.target/aarch64/crc-crc32c-data8.c
>> > new file mode 100644
>> > index 00000000000..e8a8901e453
>> > --- /dev/null
>> > +++ b/gcc/testsuite/gcc.target/aarch64/crc-crc32c-data8.c
>> > @@ -0,0 +1,53 @@
>> > +/* { dg-do run } */
>> > +/* { dg-options "-march=armv8-a+crc -O2 -fdump-rtl-dfinish
>> > -fdump-tree-crc" } */
>> > +/* { dg-skip-if "" { *-*-* } { "-flto"} } */
>> > +
>> > +#include <stdint.h>
>> > +#include <stdlib.h>
>> > +
>> > +__attribute__ ((noinline,optimize(0)))
>> > +uint32_t _crc32_O0 (uint32_t crc, uint8_t data) {
>> > + int i;
>> > + crc = crc ^ data;
>> > +
>> > + for (i = 0; i < 8; i++) {
>> > + if (crc & 1)
>> > + crc = (crc >> 1) ^ 0x82F63B78;
>> > + else
>> > + crc = (crc >> 1);
>> > + }
>> > +
>> > + return crc;
>> > +}
>> > +
>> > +uint32_t _crc32 (uint32_t crc, uint8_t data) {
>> > + int i;
>> > + crc = crc ^ data;
>> > +
>> > + for (i = 0; i < 8; i++) {
>> > + if (crc & 1)
>> > + crc = (crc >> 1) ^ 0x82F63B78;
>> > + else
>> > + crc = (crc >> 1);
>> > + }
>> > +
>> > + return crc;
>> > +}
>> > +
>> > +int main ()
>> > +{
>> > + uint32_t crc = 0x0D800D80;
>> > + for (uint8_t i = 0; i < 0xff; i++)
>> > + {
>> > + uint32_t res1 = _crc32_O0 (crc, i);
>> > + uint32_t res2 = _crc32 (crc, i);
>> > + if (res1 != res2)
>> > + abort ();
>> > + crc = res1;
>> > + }
>> > +}
>> > +
>> > +/* { dg-final { scan-tree-dump "calculates CRC!" "crc"} } */
>> > +/* { dg-final { scan-tree-dump-times "Couldn't generate faster CRC code."
>> > 0 "crc"} } */
>> > +/* { dg-final { scan-rtl-dump "UNSPEC_CRC32C" "dfinish"} } */
>> > +/* { dg-final { scan-rtl-dump-times "pmull" 0 "dfinish"} } */
