diff options
| -rw-r--r-- | llvm/lib/CodeGen/MachineInstr.cpp | 2 | ||||
| -rw-r--r-- | llvm/test/CodeGen/X86/volatile.ll | 17 |
2 files changed, 18 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/MachineInstr.cpp b/llvm/lib/CodeGen/MachineInstr.cpp index 4db02f49819..4a7059a515f 100644 --- a/llvm/lib/CodeGen/MachineInstr.cpp +++ b/llvm/lib/CodeGen/MachineInstr.cpp @@ -707,7 +707,7 @@ bool MachineInstr::isSafeToMove(const TargetInstrInfo *TII, bool &SawStore) { if (TID->mayLoad() && !TII->isInvariantLoad(this)) // Otherwise, this is a real load. If there is a store between the load and // end of block, or if the laod is volatile, we can't move it. - return SawStore || hasVolatileMemoryRef(); + return !SawStore && !hasVolatileMemoryRef(); return true; } diff --git a/llvm/test/CodeGen/X86/volatile.ll b/llvm/test/CodeGen/X86/volatile.ll new file mode 100644 index 00000000000..e40f87b30e4 --- /dev/null +++ b/llvm/test/CodeGen/X86/volatile.ll @@ -0,0 +1,17 @@ +; RUN: llvm-as < %s | llc -march=x86 -mattr=sse2 | grep movsd | count 5 +; RUN: llvm-as < %s | llc -march=x86 -mattr=sse2 -fast | grep movsd | count 5 + +@x = external global double + +define void @foo() nounwind { + %a = volatile load double* @x + volatile store double 0.0, double* @x + volatile store double 0.0, double* @x + %b = volatile load double* @x + ret void +} + +define void @bar() nounwind { + %c = volatile load double* @x + ret void +} |
