Attached patch implements V2SFmode FMA insn patterns. Patched compiler
vectorizes FMA, FMS and FNMA instructions, but for some reason fails
to vectorize FNMS.
I have double checked that the insn pattern is correct, and now I'm
all out of ideas what could be wrong with the pattern, still ignored
by the vectorizer. -fno-vect-cost-model does not help so it's time to
ask the experts...
gcc/ChangeLog:
2020-05-11 Uroš Bizjak <ubiz...@gmail.com>
PR target/95046
* config/i386/mmx.md (fmav2sf4): New insn pattern.
(fmsv2sf4): Ditto.
(fnmav2sf4): Ditto.
(fnmsv2sf4): Ditto.
testsuite/ChangeLog:
2020-05-11 Uroš Bizjak <ubiz...@gmail.com>
PR target/95046
* gcc.target/i386/pr95046-2.c: New test.
Otherwise, the patch is bootstrapped and regression tested on
x86_64-linux-gnu {,-m32}.
Uros.
diff --git a/gcc/config/i386/mmx.md b/gcc/config/i386/mmx.md
index a8f603b94f8..0024ce761d7 100644
--- a/gcc/config/i386/mmx.md
+++ b/gcc/config/i386/mmx.md
@@ -345,6 +345,70 @@
(set_attr "prefix" "*,orig,vex")
(set_attr "mode" "V2SF,V4SF,V4SF")])
+(define_insn "fmav2sf4"
+ [(set (match_operand:V2SF 0 "register_operand" "=v,v,x")
+ (fma:V2SF
+ (match_operand:V2SF 1 "register_operand" "%0,v,x")
+ (match_operand:V2SF 2 "register_operand" "v,v,x")
+ (match_operand:V2SF 3 "register_operand" "v,0,x")))]
+ "(TARGET_FMA || TARGET_FMA4) && TARGET_MMX_WITH_SSE"
+ "@
+ vfmadd132ps\t{%2, %3, %0|%0, %3, %2}
+ vfmadd231ps\t{%2, %1, %0|%0, %1, %2}
+ vfmaddps\t{%3, %2, %1, %0|%0, %1, %2, %3}"
+ [(set_attr "isa" "fma,fma,fma4")
+ (set_attr "type" "ssemuladd")
+ (set_attr "mode" "V4SF")])
+
+(define_insn "fmsv2sf4"
+ [(set (match_operand:V2SF 0 "register_operand" "=v,v,x")
+ (fma:V2SF
+ (match_operand:V2SF 1 "register_operand" "%0,v,x")
+ (match_operand:V2SF 2 "register_operand" "v,v,x")
+ (neg:V2SF
+ (match_operand:V2SF 3 "register_operand" "v,0,x"))))]
+ "(TARGET_FMA || TARGET_FMA4) && TARGET_MMX_WITH_SSE"
+ "@
+ vfmsub132ps\t{%2, %3, %0|%0, %3, %2}
+ vfmsub231ps\t{%2, %1, %0|%0, %1, %2}
+ vfmsubps\t{%3, %2, %1, %0|%0, %1, %2, %3}"
+ [(set_attr "isa" "fma,fma,fma4")
+ (set_attr "type" "ssemuladd")
+ (set_attr "mode" "V4SF")])
+
+(define_insn "fnmav2sf4"
+ [(set (match_operand:V2SF 0 "register_operand" "=v,v,x")
+ (fma:V2SF
+ (neg:V2SF
+ (match_operand:V2SF 1 "register_operand" "%0,v,x"))
+ (match_operand:V2SF 2 "register_operand" "v,v,x")
+ (match_operand:V2SF 3 "register_operand" "v,0,x")))]
+ "(TARGET_FMA || TARGET_FMA4) && TARGET_MMX_WITH_SSE"
+ "@
+ vfnmadd132ps\t{%2, %3, %0|%0, %3, %2}
+ vfnmadd231ps\t{%2, %1, %0|%0, %1, %2}
+ vfnmaddps\t{%3, %2, %1, %0|%0, %1, %2, %3}"
+ [(set_attr "isa" "fma,fma,fma4")
+ (set_attr "type" "ssemuladd")
+ (set_attr "mode" "V4SF")])
+
+(define_insn "fnmsv2sf4"
+ [(set (match_operand:V2SF 0 "register_operand" "=v,v,x")
+ (fma:V2SF
+ (neg:V2SF
+ (match_operand:V2SF 1 "register_operand" "%0,v,x"))
+ (match_operand:V2SF 2 "register_operand" "v,v,x")
+ (neg:V2SF
+ (match_operand:V2SF 3 "register_operand" "v,0,x"))))]
+ "(TARGET_FMA || TARGET_FMA4) && TARGET_MMX_WITH_SSE"
+ "@
+ vfnmsub132ps\t{%2, %3, %0|%0, %3, %2}
+ vfnmsub231ps\t{%2, %1, %0|%0, %1, %2}
+ vfnmsubps\t{%3, %2, %1, %0|%0, %1, %2, %3}"
+ [(set_attr "isa" "fma,fma,fma4")
+ (set_attr "type" "ssemuladd")
+ (set_attr "mode" "V4SF")])
+
(define_expand "mmx_<code>v2sf3"
[(set (match_operand:V2SF 0 "register_operand")
(smaxmin:V2SF
/* PR target/95046 */
/* { dg-do compile { target { ! ia32 } } } */
/* { dg-options "-O3 -mfma" } */
float r[2], a[2], b[2], c[2];
void
test_fma (void)
{
for (int i = 0; i < 2; i++)
r[i] = a[i] * b[i] + c[i];
}
/* { dg-final { scan-assembler "fmadd132ps" } } */
void
test_fms (void)
{
for (int i = 0; i < 2; i++)
r[i] = a[i] * b[i] - c[i];
}
/* { dg-final { scan-assembler "fmsub132ps" } } */
void
test_fnma (void)
{
for (int i = 0; i < 2; i++)
r[i] = -(a[i] * b[i]) + c[i];
}
/* { dg-final { scan-assembler "fnmadd132ps" } } */
void
test_fnms (void)
{
for (int i = 0; i < 2; i++)
r[i] = -(a[i] * b[i]) - c[i];
}
/* { dg-final { scan-assembler "fnmsub132ps" } } */
