[PowerPC] Disable direct moves for extractelement and bitcast in 32-bit mode

This patch corresponds to review:
http://reviews.llvm.org/D17711

It disables direct moves on these operations in 32-bit mode since the patterns
assume 64-bit registers. The final patch is slightly different from the
Phabricator review as the bitcast operations needed to be disabled in 32-bit
mode as well. This fixes PR26617.

llvm-svn: 264282

diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
index 9d1eee0..70a22af 100644 (file)
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -255,7 +255,7 @@ PPCTargetLowering::PPCTargetLowering(const PPCTargetMachine &TM,
   setOperationAction(ISD::SINT_TO_FP, MVT::i32, Expand);
   setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
 
-  if (Subtarget.hasDirectMove()) {
+  if (Subtarget.hasDirectMove() && isPPC64) {
     setOperationAction(ISD::BITCAST, MVT::f32, Legal);
     setOperationAction(ISD::BITCAST, MVT::i32, Legal);
     setOperationAction(ISD::BITCAST, MVT::i64, Legal);
@@ -557,7 +557,7 @@ PPCTargetLowering::PPCTargetLowering(const PPCTargetMachine &TM,
         setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4f32, Legal);
         setOperationAction(ISD::EXTRACT_VECTOR_ELT, MVT::v4f32, Legal);
       }
-      if (Subtarget.hasDirectMove()) {
+      if (Subtarget.hasDirectMove() && isPPC64) {
         setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v16i8, Legal);
         setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v8i16, Legal);
         setOperationAction(ISD::SCALAR_TO_VECTOR, MVT::v4i32, Legal);

diff --git a/llvm/test/CodeGen/PowerPC/pr26617.ll b/llvm/test/CodeGen/PowerPC/pr26617.ll
new file mode 100644 (file)
index 0000000..474d7b9
--- /dev/null
+++ b/llvm/test/CodeGen/PowerPC/pr26617.ll
@@ -0,0 +1,15 @@
+; RUN: llc -mcpu=pwr8 -mtriple=powerpc-unknown-unknown < %s | FileCheck %s
+define i32 @test(<4 x i32> %v, i32 %elem) #0 {
+entry:
+  %vecext = extractelement <4 x i32> %v, i32 %elem
+  ret i32 %vecext
+}
+; CHECK: stxvw4x 34,
+; CHECK: lwzx 3,
+
+define float @test2(i32 signext %a) {
+entry:
+  %conv = bitcast i32 %a to float
+  ret float %conv
+}
+; CHECK-NOT: mtvsr