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[mips] Make sure sret argument is returned in register V0.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166539 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka 2012-10-24 02:10:54 +00:00
parent 847a9c6d77
commit 2ef5bd3ba6
2 changed files with 6 additions and 3 deletions
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5
lib/Target/Mips/MipsISelLowering.cpp
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@ -3539,10 +3539,11 @@ MipsTargetLowering::LowerReturn(SDValue Chain,
if (!Reg)
llvm_unreachable("sret virtual register not created in the entry block");
SDValue Val = DAG.getCopyFromReg(Chain, dl, Reg, getPointerTy());
unsigned V0 = IsN64 ? Mips::V0_64 : Mips::V0;
Chain = DAG.getCopyToReg(Chain, dl, IsN64 ? Mips::V0_64 : Mips::V0, Val,
Flag);
Chain = DAG.getCopyToReg(Chain, dl, V0, Val, Flag);
Flag = Chain.getValue(1);
MF.getRegInfo().addLiveOut(V0);
}
// Return on Mips is always a "jr $ra"

4
test/CodeGen/Mips/mips64-sret.ll
View File

@ -1,4 +1,4 @@
; RUN: llc -march=mips64el -mcpu=mips64r2 -mattr=n64 -O0 < %s
; RUN: llc -march=mips64el -mcpu=mips64r2 -mattr=n64 -O3 < %s | FileCheck %s
%struct.S = type { [8 x i32] }
@ -6,6 +6,8 @@
define void @f(%struct.S* noalias sret %agg.result) nounwind {
entry:
; CHECK: daddu $2, $zero, $4
%0 = bitcast %struct.S* %agg.result to i8*
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* bitcast (%struct.S* @g to i8*), i64 32, i32 4, i1 false)
ret void