Fix PR10499

- Check whether SSE is available before lowering all 1s vector building with
  PCMPEQD, which is only available from SSE2

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176058 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 1543e23a46f501f232d2b1887bd20e841558ea69..57014dd488089126a86a05129d873ae15fd9499e 100644 (file)
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -5344,7 +5344,7 @@ X86TargetLowering::LowerBUILD_VECTOR(SDValue Op, SelectionDAG &DAG) const {
   // Vectors containing all ones can be matched by pcmpeqd on 128-bit width
   // vectors or broken into v4i32 operations on 256-bit vectors. AVX2 can use
   // vpcmpeqd on 256-bit vectors.
-  if (ISD::isBuildVectorAllOnes(Op.getNode())) {
+  if (ISD::isBuildVectorAllOnes(Op.getNode()) && Subtarget->hasSSE2()) {
     if (VT == MVT::v4i32 || (VT == MVT::v8i32 && Subtarget->hasInt256()))
       return Op;
 

diff --git a/test/CodeGen/X86/pr10499.ll b/test/CodeGen/X86/pr10499.ll
new file mode 100644 (file)
index 0000000..f9cc747
--- /dev/null
+++ b/test/CodeGen/X86/pr10499.ll
@@ -0,0 +1,14 @@
+; RUN: llc < %s -mtriple=x86_64-pc-linux -mcpu=corei7-avx -mattr=-sse2
+
+; No check as PR10499 is a crashing bug.
+
+define void @autogen_24438_500() {
+BB:
+  %I = insertelement <8 x i32> undef, i32 -1, i32 4
+  %BC = bitcast <8 x i32> %I to <8 x float>
+  br label %CF
+
+CF:                                               ; preds = %CF, %BB
+  %ZE = fpext <8 x float> %BC to <8 x double>
+  br label %CF
+}