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Don't forget to mark RAX as live-out of the function when arranging for

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it to hold the address of an sret return value, for x86-64 ABI purposes.

Also, fix the test that was originally intended to test this to actually
test it, using FileCheck.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83853 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-10-12 16:36:12 +00:00
parent 6bd6ede7d7
commit 0032681424
2 changed files with 13 additions and 1 deletions
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3
lib/Target/X86/X86ISelLowering.cpp
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@ -1162,6 +1162,9 @@ X86TargetLowering::LowerReturn(SDValue Chain,
Chain = DAG.getCopyToReg(Chain, dl, X86::RAX, Val, Flag);
Flag = Chain.getValue(1);
// RAX now acts like a return value.
MF.getRegInfo().addLiveOut(X86::RAX);
}
RetOps[0] = Chain; // Update chain.

11
test/CodeGen/X86/x86-64-sret-return.ll
View File

@ -1,9 +1,11 @@
; RUN: llc < %s
; RUN: llc < %s | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
target triple = "x86_64-apple-darwin8"
%struct.foo = type { [4 x i64] }
; CHECK: bar:
; CHECK: movq %rdi, %rax
define void @bar(%struct.foo* noalias sret %agg.result, %struct.foo* %d) nounwind {
entry:
%d_addr = alloca %struct.foo* ; <%struct.foo**> [#uses=2]
@ -52,3 +54,10 @@ entry:
return: ; preds = %entry
ret void
}
; CHECK: foo:
; CHECK: movq %rdi, %rax
define void @foo({ i64 }* noalias nocapture sret %agg.result) nounwind {
store { i64 } { i64 0 }, { i64 }* %agg.result
ret void
}