[llvm-branch-commits] [llvm] release/18.x: [X86][EVEX512] Check hasEVEX512 for canExtendTo512DQ (#90390) (PR #90422)

[via llvm-branch-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-x86

Author: None (llvmbot)

<details>
<summary>Changes</summary>

Backport 35b89dda2b9734917824b1457f149192669b314c

Requested by: @<!-- -->phoebewang

---
Full diff: https://github.com/llvm/llvm-project/pull/90422.diff


2 Files Affected:

- (modified) llvm/lib/Target/X86/X86Subtarget.h (+2-1) 
- (modified) llvm/test/CodeGen/X86/avx512bwvl-arith.ll (+33-2) 


``````````diff
diff --git a/llvm/lib/Target/X86/X86Subtarget.h b/llvm/lib/Target/X86/X86Subtarget.h
index a458b5f9ec8fbb..4d55a084b730e4 100644
--- a/llvm/lib/Target/X86/X86Subtarget.h
+++ b/llvm/lib/Target/X86/X86Subtarget.h
@@ -244,7 +244,8 @@ class X86Subtarget final : public X86GenSubtargetInfo {
   // TODO: Currently we're always allowing widening on CPUs without VLX,
   // because for many cases we don't have a better option.
   bool canExtendTo512DQ() const {
-    return hasAVX512() && (!hasVLX() || getPreferVectorWidth() >= 512);
+    return hasAVX512() && hasEVEX512() &&
+           (!hasVLX() || getPreferVectorWidth() >= 512);
   }
   bool canExtendTo512BW() const  {
     return hasBWI() && canExtendTo512DQ();
diff --git a/llvm/test/CodeGen/X86/avx512bwvl-arith.ll b/llvm/test/CodeGen/X86/avx512bwvl-arith.ll
index 4988fc35b10eef..fdc25f44b156a7 100644
--- a/llvm/test/CodeGen/X86/avx512bwvl-arith.ll
+++ b/llvm/test/CodeGen/X86/avx512bwvl-arith.ll
@@ -1,6 +1,6 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+avx512bw,+avx512vl | FileCheck %s
-; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+avx512bw,+avx512vl,-evex512 | FileCheck %s
+; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+avx512bw,+avx512vl | FileCheck %s --check-prefixes=CHECK,EVEX256
+; RUN: llc < %s -mtriple=x86_64-unknown-unknown -mattr=+avx512bw,+avx512vl,-evex512 | FileCheck %s --check-prefixes=CHECK,EVEX512
 
 ; 256-bit
 
@@ -236,3 +236,34 @@ define <8 x i16> @vpmullw128_test(<8 x i16> %i, <8 x i16> %j) {
   ret <8 x i16> %x
 }
 
+define i16 @PR90356(<16 x i1> %a) {
+; EVEX256-LABEL: PR90356:
+; EVEX256:       # %bb.0:
+; EVEX256-NEXT:    vpsllw $7, %xmm0, %xmm0
+; EVEX256-NEXT:    vpmovb2m %xmm0, %k1
+; EVEX256-NEXT:    vpternlogd $255, %zmm0, %zmm0, %zmm0 {%k1} {z}
+; EVEX256-NEXT:    movb $63, %al
+; EVEX256-NEXT:    kmovd %eax, %k1
+; EVEX256-NEXT:    vpexpandq %zmm0, %zmm0 {%k1} {z}
+; EVEX256-NEXT:    vptestmd %zmm0, %zmm0, %k0
+; EVEX256-NEXT:    kmovd %k0, %eax
+; EVEX256-NEXT:    # kill: def $ax killed $ax killed $eax
+; EVEX256-NEXT:    vzeroupper
+; EVEX256-NEXT:    retq
+;
+; EVEX512-LABEL: PR90356:
+; EVEX512:       # %bb.0:
+; EVEX512-NEXT:    vpsllw $7, %xmm0, %xmm0
+; EVEX512-NEXT:    vpmovb2m %xmm0, %k0
+; EVEX512-NEXT:    vpmovm2w %k0, %ymm0
+; EVEX512-NEXT:    vpxor %xmm1, %xmm1, %xmm1
+; EVEX512-NEXT:    vpblendd {{.*#+}} ymm0 = ymm0[0,1,2,3,4,5],ymm1[6,7]
+; EVEX512-NEXT:    vpmovw2m %ymm0, %k0
+; EVEX512-NEXT:    kmovd %k0, %eax
+; EVEX512-NEXT:    # kill: def $ax killed $ax killed $eax
+; EVEX512-NEXT:    vzeroupper
+; EVEX512-NEXT:    retq
+  %1 = shufflevector <16 x i1> %a, <16 x i1> zeroinitializer, <16 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7, i32 8, i32 9, i32 10, i32 11, i32 28, i32 29, i32 30, i32 31>
+  %2 = bitcast <16 x i1> %1 to i16
+  ret i16 %2
+}

``````````

</details>


https://github.com/llvm/llvm-project/pull/90422