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ARM: make sure we keep inline asm operands tied.

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When patching inlineasm nodes to use GPRPair for 64-bit values, we
were dropping the information that two operands were tied, which
effectively broke the live-interval of vregs affected.

llvm-svn: 188643
This commit is contained in:
Tim Northover 2013-08-18 18:06:03 +00:00
parent 406cf0ea6d
commit 057a4d7c26
2 changed files with 13 additions and 1 deletions
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5
lib/Target/ARM/ARMISelDAGToDAG.cpp
View File

@ -3614,7 +3614,10 @@ SDNode *ARMDAGToDAGISel::SelectInlineAsm(SDNode *N){
if(PairedReg.getNode()) {
OpChanged[OpChanged.size() -1 ] = true;
Flag = InlineAsm::getFlagWord(Kind, 1 /* RegNum*/);
Flag = InlineAsm::getFlagWordForRegClass(Flag, ARM::GPRPairRegClassID);
if (IsTiedToChangedOp)
Flag = InlineAsm::getFlagWordForMatchingOp(Flag, DefIdx);
else
Flag = InlineAsm::getFlagWordForRegClass(Flag, ARM::GPRPairRegClassID);
// Replace the current flag.
AsmNodeOperands[AsmNodeOperands.size() -1] = CurDAG->getTargetConstant(
Flag, MVT::i32);

9
test/CodeGen/ARM/inlineasm-64bit.ll
View File

@ -85,3 +85,12 @@ define void @strd_test(i64* %p, i32 %lo, i32 %hi) nounwind {
tail call void asm sideeffect "strd $0, ${0:H}, [$1]", "r,r"(i64 %4, i64* %p) nounwind
ret void
}
; Make sure we don't untie operands by mistake.
define i64 @tied_64bit_test(i64 %in) nounwind {
; CHECK-LABEL: tied_64bit_test:
; CHECK: OUT([[OUTREG:r[0-9]+]]), IN([[OUTREG]])
%addr = alloca i64
call void asm "OUT($0), IN($1)", "=*rm,0"(i64* %addr, i64 %in)
ret i64 %in
}