[PATCH] D131947: [X86] Fix a lowering issue of mask.compress which has undef float passthrough

[Bing Yu via Phabricator via llvm-commits]

This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG807b8cb06ca0: [X86] Fix a lowering issue of mask.compress which has undef float passthrough (authored by yubing).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D131947/new/

https://reviews.llvm.org/D131947

Files:
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/test/CodeGen/X86/compress-undef-float-passthrough.ll


Index: llvm/test/CodeGen/X86/compress-undef-float-passthrough.ll
===================================================================
--- /dev/null
+++ llvm/test/CodeGen/X86/compress-undef-float-passthrough.ll
@@ -0,0 +1,25 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc < %s -mtriple=x86_64-- -mattr=avx512f,avx512vl | FileCheck %s --check-prefix=CHECK
+
+define void @test_compress_undef_float_passthrough() {
+; CHECK-LABEL: test_compress_undef_float_passthrough:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    movb $5, %al
+; CHECK-NEXT:    kmovw %eax, %k1
+; CHECK-NEXT:    vcompresspd %ymm0, %ymm0 {%k1} {z}
+; CHECK-NEXT:    vscatterqpd %ymm0, (,%ymm0) {%k1}
+; CHECK-NEXT:    vzeroupper
+; CHECK-NEXT:    retq
+entry:                                          ; preds = %loop.50
+  %0 = bitcast i4 undef to <4 x i1>
+  %1 = call <4 x double> @llvm.x86.avx512.mask.compress.v4f64(<4 x double> undef, <4 x double> undef, <4 x i1> <i1 1, i1 0, i1 1, i1 0>)
+  call void @llvm.masked.scatter.v4f64.v4p0f64(<4 x double> %1, <4 x double*> undef, i32 0, <4 x i1> %0)
+  ret void
+}
+
+; Function Attrs: nounwind readnone
+declare <4 x double> @llvm.x86.avx512.mask.compress.v4f64(<4 x double>, <4 x double>, <4 x i1>)
+
+; Function Attrs: nocallback nofree nosync nounwind willreturn writeonly
+declare void @llvm.masked.scatter.v4f64.v4p0f64(<4 x double>, <4 x double*>, i32 immarg, <4 x i1>)
+
Index: llvm/lib/Target/X86/X86ISelLowering.cpp
===================================================================
--- llvm/lib/Target/X86/X86ISelLowering.cpp
+++ llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -27038,7 +27038,7 @@
 
       // Avoid false dependency.
       if (PassThru.isUndef())
-        PassThru = DAG.getConstant(0, dl, VT);
+        PassThru = getZeroVector(VT, Subtarget, DAG, dl);
 
       return DAG.getNode(IntrData->Opc0, dl, VT, DataToCompress, PassThru,
                          Mask);


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