> -----Original Message-----
> From: Richard Sandiford <richard.sandif...@arm.com>
> Sent: 29 September 2020 11:27
> To: Kyrylo Tkachov <kyrylo.tkac...@arm.com>
> Cc: gcc-patches@gcc.gnu.org; ni...@redhat.com; Richard Earnshaw
> <richard.earns...@arm.com>; Ramana Radhakrishnan
> <ramana.radhakrish...@arm.com>; Dennis Zhang
> <dennis.zh...@arm.com>
> Subject: Ping: [PATCH] arm: Add new vector mode macros
>
> Ping
>
> Richard Sandiford <richard.sandif...@arm.com> writes:
> > Kyrylo Tkachov <kyrylo.tkac...@arm.com> writes:
> >> This looks like a productive way forward to me.
> >> Okay if the other maintainer don't object by the end of the week.
> >
> > Thanks. Dennis pointed out off-list that it regressed
> > armv8_2-fp16-arith-2.c, which was expecting FP16 vectorisation
> > to be rejected for -fno-fast-math. As mentioned above, that shouldn't
> > be necessary given that FP16 arithmetic (unlike FP32 arithmetic) has a
> > flush-to-zero control.
> >
> > This version therefore updates the test to expect the same output
> > as the -ffast-math version.
> >
> > Tested on arm-linux-gnueabi (hopefully for real this time -- I must
> > have messed up the testing last time). OK for trunk?
> >
Ok.
Thanks,
Kyrill
> > FWIW, the non-testsuite part is the same as before.
> >
> > Richard
> >
> >
> > gcc/
> > * config/arm/arm.h (ARM_HAVE_NEON_V8QI_ARITH,
> ARM_HAVE_NEON_V4HI_ARITH)
> > (ARM_HAVE_NEON_V2SI_ARITH, ARM_HAVE_NEON_V16QI_ARITH):
> New macros.
> > (ARM_HAVE_NEON_V8HI_ARITH, ARM_HAVE_NEON_V4SI_ARITH):
> Likewise.
> > (ARM_HAVE_NEON_V2DI_ARITH, ARM_HAVE_NEON_V4HF_ARITH):
> Likewise.
> > (ARM_HAVE_NEON_V8HF_ARITH, ARM_HAVE_NEON_V2SF_ARITH):
> Likewise.
> > (ARM_HAVE_NEON_V4SF_ARITH, ARM_HAVE_V8QI_ARITH,
> ARM_HAVE_V4HI_ARITH)
> > (ARM_HAVE_V2SI_ARITH, ARM_HAVE_V16QI_ARITH,
> ARM_HAVE_V8HI_ARITH)
> > (ARM_HAVE_V4SI_ARITH, ARM_HAVE_V2DI_ARITH,
> ARM_HAVE_V4HF_ARITH)
> > (ARM_HAVE_V2SF_ARITH, ARM_HAVE_V8HF_ARITH,
> ARM_HAVE_V4SF_ARITH):
> > Likewise.
> > * config/arm/iterators.md (VNIM, VNINOTM): Delete.
> > * config/arm/vec-common.md (add<VNIM:mode>3, addv8hf3)
> > (add<VNINOTM:mode>3): Replace with...
> > (add<VDQ:mode>3): ...this new expander.
> > * config/arm/neon.md (*add<VDQ:mode>3_neon): Use the new
> > ARM_HAVE_NEON_<MODE>_ARITH macros as the C condition.
> > (addv8hf3_neon, addv4hf3, add<VFH:mode>3_fp16): Delete in
> > favor of the above.
> > (neon_vadd<VH:mode>): Use gen_add<mode>3 instead of
> > gen_add<mode>3_fp16.
> >
> > gcc/testsuite/
> > * gcc.target/arm/armv8_2-fp16-arith-2.c: Expect FP16 vectorization
> > even without -ffast-math.
> > ---
> > gcc/config/arm/arm.h | 41 ++++++++++++++++
> > gcc/config/arm/iterators.md | 8 ----
> > gcc/config/arm/neon.md | 47 +------------------
> > gcc/config/arm/vec-common.md | 42 ++---------------
> > .../gcc.target/arm/armv8_2-fp16-arith-2.c | 20 +++++---
> > 5 files changed, 61 insertions(+), 97 deletions(-)
> >
> > diff --git a/gcc/config/arm/arm.h b/gcc/config/arm/arm.h
> > index f4d3676c5bc..4a63d33c70d 100644
> > --- a/gcc/config/arm/arm.h
> > +++ b/gcc/config/arm/arm.h
> > @@ -1110,6 +1110,47 @@ extern const int arm_arch_cde_coproc_bits[];
> > #define VALID_MVE_STRUCT_MODE(MODE) \
> > ((MODE) == TImode || (MODE) == OImode || (MODE) == XImode)
> >
> > +/* The conditions under which vector modes are supported for general
> > + arithmetic using Neon. */
> > +
> > +#define ARM_HAVE_NEON_V8QI_ARITH TARGET_NEON
> > +#define ARM_HAVE_NEON_V4HI_ARITH TARGET_NEON
> > +#define ARM_HAVE_NEON_V2SI_ARITH TARGET_NEON
> > +
> > +#define ARM_HAVE_NEON_V16QI_ARITH TARGET_NEON
> > +#define ARM_HAVE_NEON_V8HI_ARITH TARGET_NEON
> > +#define ARM_HAVE_NEON_V4SI_ARITH TARGET_NEON
> > +#define ARM_HAVE_NEON_V2DI_ARITH TARGET_NEON
> > +
> > +/* HF operations have their own flush-to-zero control (FPSCR.FZ16). */
> > +#define ARM_HAVE_NEON_V4HF_ARITH TARGET_NEON_FP16INST
> > +#define ARM_HAVE_NEON_V8HF_ARITH TARGET_NEON_FP16INST
> > +
> > +/* SF operations always flush to zero, regardless of FPSCR.FZ, so we can
> > + only use them for general arithmetic when -funsafe-math-optimizations
> > + is in effect. */
> > +#define ARM_HAVE_NEON_V2SF_ARITH \
> > + (TARGET_NEON && flag_unsafe_math_optimizations)
> > +#define ARM_HAVE_NEON_V4SF_ARITH ARM_HAVE_NEON_V2SF_ARITH
> > +
> > +/* The conditions under which vector modes are supported for general
> > + arithmetic by any vector extension. */
> > +
> > +#define ARM_HAVE_V8QI_ARITH (ARM_HAVE_NEON_V8QI_ARITH ||
> TARGET_REALLY_IWMMXT)
> > +#define ARM_HAVE_V4HI_ARITH (ARM_HAVE_NEON_V4HI_ARITH ||
> TARGET_REALLY_IWMMXT)
> > +#define ARM_HAVE_V2SI_ARITH (ARM_HAVE_NEON_V2SI_ARITH ||
> TARGET_REALLY_IWMMXT)
> > +
> > +#define ARM_HAVE_V16QI_ARITH (ARM_HAVE_NEON_V16QI_ARITH ||
> TARGET_HAVE_MVE)
> > +#define ARM_HAVE_V8HI_ARITH (ARM_HAVE_NEON_V8HI_ARITH ||
> TARGET_HAVE_MVE)
> > +#define ARM_HAVE_V4SI_ARITH (ARM_HAVE_NEON_V4SI_ARITH ||
> TARGET_HAVE_MVE)
> > +#define ARM_HAVE_V2DI_ARITH ARM_HAVE_NEON_V2DI_ARITH
> > +
> > +#define ARM_HAVE_V4HF_ARITH ARM_HAVE_NEON_V4HF_ARITH
> > +#define ARM_HAVE_V2SF_ARITH ARM_HAVE_NEON_V2SF_ARITH
> > +
> > +#define ARM_HAVE_V8HF_ARITH (ARM_HAVE_NEON_V8HF_ARITH ||
> TARGET_HAVE_MVE_FLOAT)
> > +#define ARM_HAVE_V4SF_ARITH (ARM_HAVE_NEON_V4SF_ARITH ||
> TARGET_HAVE_MVE_FLOAT)
> > +
> > /* The register numbers in sequence, for passing to
> arm_gen_load_multiple. */
> > extern int arm_regs_in_sequence[];
> >
> > diff --git a/gcc/config/arm/iterators.md b/gcc/config/arm/iterators.md
> > index 0bc9eba0722..c70e3bc2731 100644
> > --- a/gcc/config/arm/iterators.md
> > +++ b/gcc/config/arm/iterators.md
> > @@ -66,14 +66,6 @@ (define_mode_iterator VSHFT [V4HI V2SI DI])
> > ;; Integer and float modes supported by Neon and IWMMXT.
> > (define_mode_iterator VALL [V2DI V2SI V4HI V8QI V2SF V4SI V8HI V16QI
> V4SF])
> >
> > -;; Integer and float modes supported by Neon, IWMMXT and MVE, used by
> > -;; arithmetic epxand patterns.
> > -(define_mode_iterator VNIM [V16QI V8HI V4SI V4SF])
> > -
> > -;; Integer and float modes supported by Neon and IWMMXT but not MVE,
> used by
> > -;; arithmetic epxand patterns.
> > -(define_mode_iterator VNINOTM [V2SI V4HI V8QI V2SF V2DI])
> > -
> > ;; Integer and float modes supported by Neon, IWMMXT and MVE.
> > (define_mode_iterator VNIM1 [V16QI V8HI V4SI V4SF V2DI])
> >
> > diff --git a/gcc/config/arm/neon.md b/gcc/config/arm/neon.md
> > index 3e7b51d8ab6..96bf277f501 100644
> > --- a/gcc/config/arm/neon.md
> > +++ b/gcc/config/arm/neon.md
> > @@ -501,7 +501,7 @@ (define_insn "*add<mode>3_neon"
> > [(set (match_operand:VDQ 0 "s_register_operand" "=w")
> > (plus:VDQ (match_operand:VDQ 1 "s_register_operand" "w")
> > (match_operand:VDQ 2 "s_register_operand" "w")))]
> > - "TARGET_NEON && (!<Is_float_mode> ||
> flag_unsafe_math_optimizations)"
> > + "ARM_HAVE_NEON_<MODE>_ARITH"
> > "vadd.<V_if_elem>\t%<V_reg>0, %<V_reg>1, %<V_reg>2"
> > [(set (attr "type")
> > (if_then_else (match_test "<Is_float_mode>")
> > @@ -509,49 +509,6 @@ (define_insn "*add<mode>3_neon"
> > (const_string "neon_add<q>")))]
> > )
> >
> > -;; As with SFmode, full support for HFmode vector arithmetic is only
> available
> > -;; when flag-unsafe-math-optimizations is enabled.
> > -
> > -;; Add pattern with modes V8HF and V4HF is split into separate patterns to
> add
> > -;; support for standard pattern addv8hf3 in MVE. Following pattern is
> called
> > -;; from "addv8hf3" standard pattern inside vec-common.md file.
> > -
> > -(define_insn "addv8hf3_neon"
> > - [(set
> > - (match_operand:V8HF 0 "s_register_operand" "=w")
> > - (plus:V8HF
> > - (match_operand:V8HF 1 "s_register_operand" "w")
> > - (match_operand:V8HF 2 "s_register_operand" "w")))]
> > - "TARGET_NEON_FP16INST && flag_unsafe_math_optimizations"
> > - "vadd.f16\t%<V_reg>0, %<V_reg>1, %<V_reg>2"
> > - [(set_attr "type" "neon_fp_addsub_s_q")]
> > -)
> > -
> > -(define_insn "addv4hf3"
> > - [(set
> > - (match_operand:V4HF 0 "s_register_operand" "=w")
> > - (plus:V4HF
> > - (match_operand:V4HF 1 "s_register_operand" "w")
> > - (match_operand:V4HF 2 "s_register_operand" "w")))]
> > - "TARGET_NEON_FP16INST && flag_unsafe_math_optimizations"
> > - "vadd.f16\t%<V_reg>0, %<V_reg>1, %<V_reg>2"
> > - [(set_attr "type" "neon_fp_addsub_s_q")]
> > -)
> > -
> > -(define_insn "add<mode>3_fp16"
> > - [(set
> > - (match_operand:VH 0 "s_register_operand" "=w")
> > - (plus:VH
> > - (match_operand:VH 1 "s_register_operand" "w")
> > - (match_operand:VH 2 "s_register_operand" "w")))]
> > - "TARGET_NEON_FP16INST"
> > - "vadd.<V_if_elem>\t%<V_reg>0, %<V_reg>1, %<V_reg>2"
> > - [(set (attr "type")
> > - (if_then_else (match_test "<Is_float_mode>")
> > - (const_string "neon_fp_addsub_s<q>")
> > - (const_string "neon_add<q>")))]
> > -)
> > -
> > (define_insn "*sub<mode>3_neon"
> > [(set (match_operand:VDQ 0 "s_register_operand" "=w")
> > (minus:VDQ (match_operand:VDQ 1 "s_register_operand" "w")
> > @@ -1837,7 +1794,7 @@ (define_expand "neon_vadd<mode>"
> > (match_operand:VH 2 "s_register_operand")]
> > "TARGET_NEON_FP16INST"
> > {
> > - emit_insn (gen_add<mode>3_fp16 (operands[0], operands[1],
> operands[2]));
> > + emit_insn (gen_add<mode>3 (operands[0], operands[1], operands[2]));
> > DONE;
> > })
> >
> > diff --git a/gcc/config/arm/vec-common.md b/gcc/config/arm/vec-
> common.md
> > index b7e3619caf4..c3c86c46355 100644
> > --- a/gcc/config/arm/vec-common.md
> > +++ b/gcc/config/arm/vec-common.md
> > @@ -81,43 +81,11 @@ (define_expand "movv8hf"
> > ;; patterns separately for Neon, IWMMXT and MVE.
> >
> > (define_expand "add<mode>3"
> > - [(set (match_operand:VNIM 0 "s_register_operand")
> > - (plus:VNIM (match_operand:VNIM 1 "s_register_operand")
> > - (match_operand:VNIM 2 "s_register_operand")))]
> > - "(TARGET_NEON && ((<MODE>mode != V2SFmode && <MODE>mode !=
> V4SFmode)
> > - || flag_unsafe_math_optimizations))
> > - || (TARGET_REALLY_IWMMXT && VALID_IWMMXT_REG_MODE
> (<MODE>mode))
> > - || (TARGET_HAVE_MVE && VALID_MVE_SI_MODE(<MODE>mode))
> > - || (TARGET_HAVE_MVE_FLOAT &&
> VALID_MVE_SF_MODE(<MODE>mode))"
> > -{
> > -})
> > -
> > -;; Vector arithmetic. Expanders are blank, then unnamed insns implement
> > -;; patterns separately for Neon and MVE.
> > -
> > -(define_expand "addv8hf3"
> > - [(set (match_operand:V8HF 0 "s_register_operand")
> > - (plus:V8HF (match_operand:V8HF 1 "s_register_operand")
> > - (match_operand:V8HF 2 "s_register_operand")))]
> > - "(TARGET_HAVE_MVE_FLOAT && VALID_MVE_SF_MODE(V8HFmode))
> > - || (TARGET_NEON_FP16INST && flag_unsafe_math_optimizations)"
> > -{
> > - if (TARGET_NEON_FP16INST && flag_unsafe_math_optimizations)
> > - emit_insn (gen_addv8hf3_neon (operands[0], operands[1],
> operands[2]));
> > -})
> > -
> > -;; Vector arithmetic. Expanders are blank, then unnamed insns implement
> > -;; patterns separately for Neon and IWMMXT.
> > -
> > -(define_expand "add<mode>3"
> > - [(set (match_operand:VNINOTM 0 "s_register_operand")
> > - (plus:VNINOTM (match_operand:VNINOTM 1 "s_register_operand")
> > - (match_operand:VNINOTM 2 "s_register_operand")))]
> > - "(TARGET_NEON && ((<MODE>mode != V2SFmode && <MODE>mode !=
> V4SFmode)
> > - || flag_unsafe_math_optimizations))
> > - || (TARGET_REALLY_IWMMXT && VALID_IWMMXT_REG_MODE
> (<MODE>mode))"
> > -{
> > -})
> > + [(set (match_operand:VDQ 0 "s_register_operand")
> > + (plus:VDQ (match_operand:VDQ 1 "s_register_operand")
> > + (match_operand:VDQ 2 "s_register_operand")))]
> > + "ARM_HAVE_<MODE>_ARITH"
> > +)
> >
> > ;; Vector arithmetic. Expanders are blank, then unnamed insns implement
> > ;; patterns separately for IWMMXT and Neon.
> > diff --git a/gcc/testsuite/gcc.target/arm/armv8_2-fp16-arith-2.c
> b/gcc/testsuite/gcc.target/arm/armv8_2-fp16-arith-2.c
> > index 24d0528540d..81bad225a1f 100644
> > --- a/gcc/testsuite/gcc.target/arm/armv8_2-fp16-arith-2.c
> > +++ b/gcc/testsuite/gcc.target/arm/armv8_2-fp16-arith-2.c
> > @@ -89,17 +89,23 @@ TEST_CMP (greaterthanqual, >=, int16x8_t,
> float16x8_t)
> > /* { dg-final { scan-assembler-times {vneg\.f16\ts[0-9]+, s[0-9]+} 1 } }
> > */
> > /* { dg-final { scan-assembler-times {vneg\.f16\td[0-9]+, d[0-9]+} 1 } }
> > */
> > /* { dg-final { scan-assembler-times {vneg\.f16\tq[0-9]+, q[0-9]+} 1 } }
> > */
> > +/* { dg-final { scan-assembler-times {vabs\.f16\ts[0-9]+, s[0-9]+} 2 } }
> > */
> > +
> > +/* { dg-final { scan-assembler-times {vadd\.f16\ts[0-9]+, s[0-9]+, s[0-9]+}
> 1 } } */
> > +/* { dg-final { scan-assembler-times {vadd\.f16\td[0-9]+, d[0-9]+, d[0-9]+}
> 1 } } */
> > +/* { dg-final { scan-assembler-times {vadd\.f16\tq[0-9]+, q[0-9]+, q[0-9]+}
> 1 } } */
> > +
> > +/* { dg-final { scan-assembler-times {vsub\.f16\ts[0-9]+, s[0-9]+, s[0-9]+}
> 1 } } */
> > +/* { dg-final { scan-assembler-times {vsub\.f16\td[0-9]+, d[0-9]+, d[0-9]+}
> 1 } } */
> > +/* { dg-final { scan-assembler-times {vsub\.f16\tq[0-9]+, q[0-9]+, q[0-9]+}
> 1 } } */
> > +
> > +/* { dg-final { scan-assembler-times {vmul\.f16\ts[0-9]+, s[0-9]+, s[0-9]+}
> 1 } } */
> > +/* { dg-final { scan-assembler-times {vmul\.f16\td[0-9]+, d[0-9]+, d[0-9]+}
> 1 } } */
> > +/* { dg-final { scan-assembler-times {vmul\.f16\tq[0-9]+, q[0-9]+, q[0-9]+}
> 1 } } */
> >
> > -/* { dg-final { scan-assembler-times {vadd\.f16\ts[0-9]+, s[0-9]+, s[0-9]+}
> 13 } } */
> > -/* { dg-final { scan-assembler-times {vsub\.f16\ts[0-9]+, s[0-9]+, s[0-9]+}
> 13 } } */
> > -/* { dg-final { scan-assembler-times {vmul\.f16\ts[0-9]+, s[0-9]+, s[0-9]+}
> 13 } } */
> > /* { dg-final { scan-assembler-times {vdiv\.f16\ts[0-9]+, s[0-9]+, s[0-9]+}
> 13 } } */
> > /* { dg-final { scan-assembler-times {vcmp\.f32\ts[0-9]+, s[0-9]+} 26 } }
> > */
> > -
> > /* { dg-final { scan-assembler-times {vcmpe\.f32\ts[0-9]+, s[0-9]+} 52 } }
> */
> > -/* { dg-final { scan-assembler-times {vcmpe\.f32\ts[0-9]+, #0} 2 } } */
> > -
> > -/* { dg-final { scan-assembler-not {vabs\.f16} } } */
> >
> > /* { dg-final { scan-assembler-not {vadd\.f32} } } */
> > /* { dg-final { scan-assembler-not {vsub\.f32} } } */
