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Fix small-integer VAARG on SVR4 ABI PPC64.

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The PPC64 SVR4 ABI requires integer stack arguments, and thus the var. args., that
are smaller than 64 bits be zero extended to 64 bits.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153373 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel 2012-03-24 03:53:55 +00:00
parent 5194d6dd95
commit 179a4ddd1f
2 changed files with 37 additions and 5 deletions
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22
lib/Target/PowerPC/PPCISelLowering.cpp
View File

@ -226,11 +226,23 @@ PPCTargetLowering::PPCTargetLowering(PPCTargetMachine &TM)
// VASTART needs to be custom lowered to use the VarArgsFrameIndex
setOperationAction(ISD::VASTART , MVT::Other, Custom);
// VAARG is custom lowered with the 32-bit SVR4 ABI.
if (TM.getSubtarget<PPCSubtarget>().isSVR4ABI()
&& !TM.getSubtarget<PPCSubtarget>().isPPC64()) {
setOperationAction(ISD::VAARG, MVT::Other, Custom);
setOperationAction(ISD::VAARG, MVT::i64, Custom);
if (TM.getSubtarget<PPCSubtarget>().isSVR4ABI()) {
if (TM.getSubtarget<PPCSubtarget>().isPPC64()) {
// VAARG always uses double-word chunks, so promote anything smaller.
setOperationAction(ISD::VAARG, MVT::i1, Promote);
AddPromotedToType (ISD::VAARG, MVT::i1, MVT::i64);
setOperationAction(ISD::VAARG, MVT::i8, Promote);
AddPromotedToType (ISD::VAARG, MVT::i8, MVT::i64);
setOperationAction(ISD::VAARG, MVT::i16, Promote);
AddPromotedToType (ISD::VAARG, MVT::i16, MVT::i64);
setOperationAction(ISD::VAARG, MVT::i32, Promote);
AddPromotedToType (ISD::VAARG, MVT::i32, MVT::i64);
setOperationAction(ISD::VAARG, MVT::Other, Expand);
} else {
// VAARG is custom lowered with the 32-bit SVR4 ABI.
setOperationAction(ISD::VAARG, MVT::Other, Custom);
setOperationAction(ISD::VAARG, MVT::i64, Custom);
}
} else
setOperationAction(ISD::VAARG, MVT::Other, Expand);

20
test/CodeGen/PowerPC/ppc64-vaarg-int.ll Normal file
View File

@ -0,0 +1,20 @@
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-v128:128:128-n32:64"
target triple = "powerpc64-unknown-linux-gnu"
; RUN: llc < %s | FileCheck %s
define i32 @intvaarg(i32 %a, ...) nounwind {
entry:
%va = alloca i8*, align 8
%va1 = bitcast i8** %va to i8*
call void @llvm.va_start(i8* %va1)
%0 = va_arg i8** %va, i32
%sub = sub nsw i32 %a, %0
ret i32 %sub
}
declare void @llvm.va_start(i8*) nounwind
; CHECK: @intvaarg
; Make sure that the va pointer is incremented by 8 (not 4).
; CHECK: addi{{.*}}, 8