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llvm-mirror/test/CodeGen/ARM/2009-04-09-RegScavengerAsm.ll
Bob Wilson c53238dff1 Fix pr3954. The register scavenger asserts for inline assembly with
register destinations that are tied to source operands.  The
TargetInstrDescr::findTiedToSrcOperand method silently fails for inline
assembly.  The existing MachineInstr::isRegReDefinedByTwoAddr was very
close to doing what is needed, so this revision makes a few changes to
that method and also renames it to isRegTiedToUseOperand (for consistency
with the very similar isRegTiedToDefOperand and because it handles both
two-address instructions and inline assembly with tied registers).

llvm-svn: 68714
2009-04-09 17:16:43 +00:00

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LLVM

; RUN: llvm-as < %s | llc -march=arm
; PR3954
define void @foo(...) nounwind {
entry:
%rr = alloca i32 ; <i32*> [#uses=2]
%0 = load i32* %rr ; <i32> [#uses=1]
%1 = call i32 asm "nop", "=r,0"(i32 %0) nounwind ; <i32> [#uses=1]
store i32 %1, i32* %rr
br label %return
return: ; preds = %entry
ret void
}