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Handle getresult instructions in different basic blocks

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from their aggregate operands by moving the getresult
instructions.

llvm-svn: 48657
This commit is contained in:
Dan Gohman 2008-03-21 21:01:32 +00:00
parent 308a452c90
commit 59aeac6320
2 changed files with 24 additions and 0 deletions
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9
lib/Transforms/Scalar/CodeGenPrepare.cpp
View File

@ -1127,6 +1127,15 @@ bool CodeGenPrepare::OptimizeBlock(BasicBlock &BB) {
// Sink address computing for memory operands into the block.
MadeChange |= OptimizeInlineAsmInst(I, &(*CI), SunkAddrs);
}
} else if (GetResultInst *GRI = dyn_cast<GetResultInst>(I)) {
// Ensure that all getresult instructions live in the same basic block
// as their associated struct-value instructions. Codegen requires
// this, as lowering only works on one basic block at a time.
if (Instruction *Agg = dyn_cast<Instruction>(GRI->getAggregateValue())) {
BasicBlock *AggBB = Agg->getParent();
if (AggBB != GRI->getParent())
GRI->moveBefore(AggBB->getTerminator());
}
}
}

15
test/CodeGen/X86/multiple-return-values-cross-block.ll Normal file
View File

@ -0,0 +1,15 @@
; RUN: llvm-as < %s | llc -march=x86
declare {x86_fp80, x86_fp80} @test()
define void @call2(x86_fp80 *%P1, x86_fp80 *%P2) {
%a = call {x86_fp80,x86_fp80} @test()
%b = getresult {x86_fp80,x86_fp80} %a, 1
store x86_fp80 %b, x86_fp80* %P1
br label %L
L:
%c = getresult {x86_fp80,x86_fp80} %a, 0
store x86_fp80 %c, x86_fp80* %P2
ret void
}