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| author | Jan Beulich <jbeulich@suse.com> | 2023-07-12 12:16:08 +0200 |
|---|---|---|
| committer | Jan Beulich <jbeulich@suse.com> | 2023-07-12 12:16:08 +0200 |
| commit | 8a738ac71d6c7ff5fc6bd142de3852ccdca3e0ea (patch) | |
| tree | 7d470c8fa919cbb7f6dcd0dc035857d6ccf47a03 | |
| parent | 28cdba24a9b8405d9f4ec2591c53d23a8bb74051 (diff) | |
| download | gcc-8a738ac71d6c7ff5fc6bd142de3852ccdca3e0ea.zip gcc-8a738ac71d6c7ff5fc6bd142de3852ccdca3e0ea.tar.gz gcc-8a738ac71d6c7ff5fc6bd142de3852ccdca3e0ea.tar.bz2 | |
x86: improve fast bfloat->float conversion
There's nothing AVX512BW-ish in here, so no reason to use Yw as the
constraints for the AVX alternative. Furthermore by using the 512-bit
form of VPSSLD (in a new alternative) all 32 registers can be used
directly by the insn without AVX512VL needing to be enabled.
Also adjust the originally last alternative's "prefix" attribute to
maybe_evex.
gcc/
* config/i386/i386.md (extendbfsf2_1): Add new AVX512F
alternative. Adjust original last alternative's "prefix"
attribute to maybe_evex.
| -rw-r--r-- | gcc/config/i386/i386.md | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md index 844deea..ef96834 100644 --- a/gcc/config/i386/i386.md +++ b/gcc/config/i386/i386.md @@ -5247,21 +5247,27 @@ ;; Don't use float_extend since psrlld doesn't raise ;; exceptions and turn a sNaN into a qNaN. (define_insn "extendbfsf2_1" - [(set (match_operand:SF 0 "register_operand" "=x,Yw") + [(set (match_operand:SF 0 "register_operand" "=x,Yv,v") (unspec:SF - [(match_operand:BF 1 "register_operand" " 0,Yw")] + [(match_operand:BF 1 "register_operand" " 0,Yv,v")] UNSPEC_CVTBFSF))] "TARGET_SSE2" "@ pslld\t{$16, %0|%0, 16} - vpslld\t{$16, %1, %0|%0, %1, 16}" - [(set_attr "isa" "noavx,avx") + vpslld\t{$16, %1, %0|%0, %1, 16} + vpslld\t{$16, %g1, %g0|%g0, %g1, 16}" + [(set_attr "isa" "noavx,avx,*") (set_attr "type" "sseishft1") (set_attr "length_immediate" "1") - (set_attr "prefix_data16" "1,*") - (set_attr "prefix" "orig,vex") - (set_attr "mode" "TI") - (set_attr "memory" "none")]) + (set_attr "prefix_data16" "1,*,*") + (set_attr "prefix" "orig,maybe_evex,evex") + (set_attr "mode" "TI,TI,XI") + (set_attr "memory" "none") + (set (attr "enabled") + (if_then_else (eq_attr "alternative" "2") + (symbol_ref "TARGET_AVX512F && !TARGET_AVX512VL + && !TARGET_PREFER_AVX256") + (const_string "*")))]) (define_expand "extend<mode>xf2" [(set (match_operand:XF 0 "nonimmediate_operand") |