Generate AVX/AVX2 shuffles even when there is a memory op somewhere else in the program.

Starting r155461 we are able to select patterns for vbroadcast even when the load op is used by other users.

Fix PR11900.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156539 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 32fb5ceebeb39d37b6922972e7f143972016d32f..4a312f4eb563ce9bec570de76b0e72c83b1919bf 100644 (file)
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -5029,10 +5029,6 @@ X86TargetLowering::LowerVectorBroadcast(SDValue &Op, SelectionDAG &DAG) const {
   if (!ISD::isNormalLoad(Ld.getNode()))
     return SDValue();
 
-  // Reject loads that have uses of the chain result
-  if (Ld->hasAnyUseOfValue(1))
-    return SDValue();
-
   unsigned ScalarSize = Ld.getValueType().getSizeInBits();
 
   if (ScalarSize == 32 || (Is256 && ScalarSize == 64))

diff --git a/test/CodeGen/X86/avx-vbroadcast.ll b/test/CodeGen/X86/avx-vbroadcast.ll
index 148ae7329f4b3845fbf72fd6af33424b016fa44e..26ee1d33a175a9b60b7e4d52d535c53cd7a38abd 100644 (file)
--- a/test/CodeGen/X86/avx-vbroadcast.ll
+++ b/test/CodeGen/X86/avx-vbroadcast.ll
@@ -112,3 +112,20 @@ entry:
   %vecinit2.i = insertelement <2 x double> %vecinit.i, double %q, i32 1
   ret <2 x double> %vecinit2.i
 }
+
+; CHECK: _RR
+; CHECK: vbroadcastss (%
+; CHECK: ret
+define <4 x float> @_RR(float* %ptr, i32* %k) nounwind uwtable readnone ssp {
+entry:
+  %q = load float* %ptr, align 4
+  %vecinit.i = insertelement <4 x float> undef, float %q, i32 0
+  %vecinit2.i = insertelement <4 x float> %vecinit.i, float %q, i32 1
+  %vecinit4.i = insertelement <4 x float> %vecinit2.i, float %q, i32 2
+  %vecinit6.i = insertelement <4 x float> %vecinit4.i, float %q, i32 3
+  ; force a chain
+  %j = load i32* %k, align 4
+  store i32 %j, i32* undef
+  ret <4 x float> %vecinit6.i
+}
+