diff options
Diffstat (limited to 'llvm')
| -rw-r--r-- | llvm/lib/CodeGen/CodeGenPrepare.cpp | 4 | ||||
| -rw-r--r-- | llvm/test/CodeGen/PowerPC/splitstore-check-volatile.ll | 17 |
2 files changed, 21 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/CodeGenPrepare.cpp b/llvm/lib/CodeGen/CodeGenPrepare.cpp index 355455a6146..fad3d4a596e 100644 --- a/llvm/lib/CodeGen/CodeGenPrepare.cpp +++ b/llvm/lib/CodeGen/CodeGenPrepare.cpp @@ -6657,6 +6657,10 @@ static bool splitMergedValStore(StoreInst &SI, const DataLayout &DL, DL.getTypeSizeInBits(SplitStoreType)) return false; + // Don't split the store if it is volatile. + if (SI.isVolatile()) + return false; + // Match the following patterns: // (store (or (zext LValue to i64), // (shl (zext HValue to i64), 32)), HalfValBitSize) diff --git a/llvm/test/CodeGen/PowerPC/splitstore-check-volatile.ll b/llvm/test/CodeGen/PowerPC/splitstore-check-volatile.ll new file mode 100644 index 00000000000..e40817d2e32 --- /dev/null +++ b/llvm/test/CodeGen/PowerPC/splitstore-check-volatile.ll @@ -0,0 +1,17 @@ +; Test that CodeGenPrepare respect the volatile flag when splitting a store. +; +; RUN: opt -S -codegenprepare -force-split-store < %s | FileCheck %s + +define void @fun(i16* %Src, i16* %Dst) { +; CHECK: store volatile i16 %8, i16* %Dst + %1 = load i16, i16* %Src + %2 = trunc i16 %1 to i8 + %3 = lshr i16 %1, 8 + %4 = trunc i16 %3 to i8 + %5 = zext i8 %2 to i16 + %6 = zext i8 %4 to i16 + %7 = shl nuw i16 %6, 8 + %8 = or i16 %7, %5 + store volatile i16 %8, i16* %Dst + ret void +} |
