llvm/test/CodeGen/X86/volatile.ll

; RUN: llvm-as < %s | llc -march=x86 -mattr=sse2 | grep movsd | count 5
; RUN: llvm-as < %s | llc -march=x86 -mattr=sse2 -O0 | 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
}
Fix a think-o in isSafeToMove. This fixes it from thinking that volatile memory references are safe to move. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56948 91177308-0d34-0410-b5e6-96231b3b80d8 2008-10-02 15:04:30 +00:00			`; RUN: llvm-as < %s \| llc -march=x86 -mattr=sse2 \| grep movsd \| count 5`
Second attempt: Massive check in. This changes the "-fast" flag to "-O#" in llc. If you want to use the old behavior, the flag is -O0. This change allows for finer-grained control over which optimizations are run at different -O levels. Most of this work was pretty mechanical. The majority of the fixes came from verifying that a "fast" variable wasn't used anymore. The JIT still uses a "Fast" flag. I'll change the JIT with a follow-up patch. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70343 91177308-0d34-0410-b5e6-96231b3b80d8 2009-04-29 00:15:41 +00:00			`; RUN: llvm-as < %s \| llc -march=x86 -mattr=sse2 -O0 \| grep movsd \| count 5`
Fix a think-o in isSafeToMove. This fixes it from thinking that volatile memory references are safe to move. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56948 91177308-0d34-0410-b5e6-96231b3b80d8 2008-10-02 15:04:30 +00:00
			`@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`
			`}`