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?
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"} } */
>
