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BR 3392705: AVX512: reinstate the SSE-like opcodes for VPCMPEQ/GT

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The VPCMP instructions are controlled by an immediate byte, but there
is also a set of SSE-derived legacy opcodes for VPCMPEQ and
VPCMPGT. For the specific cases of VPCMPEQ and VPCMPGT, prefer those
opcodes since they are one byte shorter.

Reported-by: ig <glucksmann@avast.com>
Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin (Intel)
2020-07-30 16:56:52 -07:00
parent 6299a3114c
commit bae6b070ff
2 changed files with 54 additions and 0 deletions
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27
test/vpcmp.asm Normal file
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@@ -0,0 +1,27 @@
bits 64
vpcmpeqb k2{k2},zmm0,zmm1
vpcmpgtb k2{k2},zmm0,zmm1
vpcmpeqw k2{k2},zmm0,zmm1
vpcmpgtw k2{k2},zmm0,zmm1
vpcmpeqd k2{k2},zmm0,zmm1
vpcmpgtd k2{k2},zmm0,zmm1
vpcmpeqq k2{k2},zmm0,zmm1
vpcmpgtq k2{k2},zmm0,zmm1
vpcmpb k2{k2},zmm0,zmm1,0
vpcmpb k2{k2},zmm0,zmm1,6
vpcmpw k2{k2},zmm0,zmm1,0
vpcmpw k2{k2},zmm0,zmm1,6
vpcmpd k2{k2},zmm0,zmm1,0
vpcmpd k2{k2},zmm0,zmm1,6
vpcmpq k2{k2},zmm0,zmm1,0
vpcmpq k2{k2},zmm0,zmm1,6
vpcmpneqb k2{k2},zmm0,zmm1
vpcmpleb k2{k2},zmm0,zmm1
vpcmpneqw k2{k2},zmm0,zmm1
vpcmplew k2{k2},zmm0,zmm1
vpcmpneqd k2{k2},zmm0,zmm1
vpcmpled k2{k2},zmm0,zmm1
vpcmpneqq k2{k2},zmm0,zmm1
vpcmpleq k2{k2},zmm0,zmm1

27
x86/insns.dat
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@@ -4811,6 +4811,33 @@ VPBROADCASTW ymmreg|mask|z,reg64 [rm: evex.256.66.0f38.w0 7b
VPBROADCASTW zmmreg|mask|z,reg16 [rm: evex.512.66.0f38.w0 7b /r ] AVX512BW,FUTURE
VPBROADCASTW zmmreg|mask|z,reg32 [rm: evex.512.66.0f38.w0 7b /r ] AVX512BW,FUTURE
VPBROADCASTW zmmreg|mask|z,reg64 [rm: evex.512.66.0f38.w0 7b /r ] AVX512BW,FUTURE
; VPCMPEQx and VPCMPGTx come in two flavors: SSE-like, and VPCMP with immediate. They are both
; valid, but prefer the SSE version as it is one byte shorter.
VPCMPEQB kreg|mask,xmmreg,xmmrm128 [rvm:fvm: evex.nds.128.66.0f.wig 74 /r ] AVX512VL,AVX512BW,FUTURE
VPCMPEQB kreg|mask,ymmreg,ymmrm256 [rvm:fvm: evex.nds.256.66.0f.wig 74 /r ] AVX512VL,AVX512BW,FUTURE
VPCMPEQB kreg|mask,zmmreg,zmmrm512 [rvm:fvm: evex.nds.512.66.0f.wig 74 /r ] AVX512BW,FUTURE
VPCMPEQD kreg|mask,xmmreg,xmmrm128|b32 [rvm:fv: evex.nds.128.66.0f.w0 76 /r ] AVX512VL,AVX512,FUTURE
VPCMPEQD kreg|mask,ymmreg,ymmrm256|b32 [rvm:fv: evex.nds.256.66.0f.w0 76 /r ] AVX512VL,AVX512,FUTURE
VPCMPEQD kreg|mask,zmmreg,zmmrm512|b32 [rvm:fv: evex.nds.512.66.0f.w0 76 /r ] AVX512,FUTURE
VPCMPEQQ kreg|mask,xmmreg,xmmrm128|b64 [rvm:fv: evex.nds.128.66.0f38.w1 29 /r ] AVX512VL,AVX512,FUTURE
VPCMPEQQ kreg|mask,ymmreg,ymmrm256|b64 [rvm:fv: evex.nds.256.66.0f38.w1 29 /r ] AVX512VL,AVX512,FUTURE
VPCMPEQQ kreg|mask,zmmreg,zmmrm512|b64 [rvm:fv: evex.nds.512.66.0f38.w1 29 /r ] AVX512,FUTURE
VPCMPEQW kreg|mask,xmmreg,xmmrm128 [rvm:fvm: evex.nds.128.66.0f.wig 75 /r ] AVX512VL,AVX512BW,FUTURE
VPCMPEQW kreg|mask,ymmreg,ymmrm256 [rvm:fvm: evex.nds.256.66.0f.wig 75 /r ] AVX512VL,AVX512BW,FUTURE
VPCMPEQW kreg|mask,zmmreg,zmmrm512 [rvm:fvm: evex.nds.512.66.0f.wig 75 /r ] AVX512BW,FUTURE
VPCMPGTB kreg|mask,xmmreg,xmmrm128 [rvm:fvm: evex.nds.128.66.0f.wig 64 /r ] AVX512VL,AVX512BW,FUTURE
VPCMPGTB kreg|mask,ymmreg,ymmrm256 [rvm:fvm: evex.nds.256.66.0f.wig 64 /r ] AVX512VL,AVX512BW,FUTURE
VPCMPGTB kreg|mask,zmmreg,zmmrm512 [rvm:fvm: evex.nds.512.66.0f.wig 64 /r ] AVX512BW,FUTURE
VPCMPGTD kreg|mask,xmmreg,xmmrm128|b32 [rvm:fv: evex.nds.128.66.0f.w0 66 /r ] AVX512VL,AVX512,FUTURE
VPCMPGTD kreg|mask,ymmreg,ymmrm256|b32 [rvm:fv: evex.nds.256.66.0f.w0 66 /r ] AVX512VL,AVX512,FUTURE
VPCMPGTD kreg|mask,zmmreg,zmmrm512|b32 [rvm:fv: evex.nds.512.66.0f.w0 66 /r ] AVX512,FUTURE
VPCMPGTQ kreg|mask,xmmreg,xmmrm128|b64 [rvm:fv: evex.nds.128.66.0f38.w1 37 /r ] AVX512VL,AVX512,FUTURE
VPCMPGTQ kreg|mask,ymmreg,ymmrm256|b64 [rvm:fv: evex.nds.256.66.0f38.w1 37 /r ] AVX512VL,AVX512,FUTURE
VPCMPGTQ kreg|mask,zmmreg,zmmrm512|b64 [rvm:fv: evex.nds.512.66.0f38.w1 37 /r ] AVX512,FUTURE
VPCMPGTW kreg|mask,xmmreg,xmmrm128 [rvm:fvm: evex.nds.128.66.0f.wig 65 /r ] AVX512VL,AVX512BW,FUTURE
VPCMPGTW kreg|mask,ymmreg,ymmrm256 [rvm:fvm: evex.nds.256.66.0f.wig 65 /r ] AVX512VL,AVX512BW,FUTURE
VPCMPGTW kreg|mask,zmmreg,zmmrm512 [rvm:fvm: evex.nds.512.66.0f.wig 65 /r ] AVX512BW,FUTURE
; The systematic VPCMP with immediate instructions
VPCMPEQB kreg|mask,xmmreg,xmmrm128 [rvmi:fvm: evex.nds.128.66.0f3a.w0 3f /r 00 ] AVX512VL,AVX512BW,FUTURE
VPCMPEQB kreg|mask,ymmreg,ymmrm256 [rvmi:fvm: evex.nds.256.66.0f3a.w0 3f /r 00 ] AVX512VL,AVX512BW,FUTURE
VPCMPEQB kreg|mask,zmmreg,zmmrm512 [rvmi:fvm: evex.nds.512.66.0f3a.w0 3f /r 00 ] AVX512BW,FUTURE