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[NVPTX] aligned byte-buffers for vector return types

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Summary:
Fixes PR21100 which is caused by inconsistency between the declared return type
and the expected return type at the call site. The new behavior is consistent
with nvcc and the NVPTXTargetLowering::getPrototype function.

Test Plan: test/Codegen/NVPTX/vector-return.ll

Reviewers: jholewinski

Reviewed By: jholewinski

Subscribers: llvm-commits, meheff, eliben, jholewinski

Differential Revision: http://reviews.llvm.org/D5612

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220607 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jingyue Wu 2014-10-25 03:46:16 +00:00
parent b31d53a60f
commit 1d1d705a95
2 changed files with 20 additions and 1 deletions
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7
lib/Target/NVPTX/NVPTXISelLowering.cpp
View File

@ -1355,7 +1355,12 @@ SDValue NVPTXTargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI,
// .param .align 16 .b8 retval0[<size-in-bytes>], or
// .param .b<size-in-bits> retval0
unsigned resultsz = TD->getTypeAllocSizeInBits(retTy);
if (retTy->isSingleValueType()) {
// Emit ".param .b<size-in-bits> retval0" instead of byte arrays only for
// these three types to match the logic in
// NVPTXAsmPrinter::printReturnValStr and NVPTXTargetLowering::getPrototype.
// Plus, this behavior is consistent with nvcc's.
if (retTy->isFloatingPointTy() || retTy->isIntegerTy() ||
retTy->isPointerTy()) {
// Scalar needs to be at least 32bit wide
if (resultsz < 32)
resultsz = 32;

14
test/CodeGen/NVPTX/vector-return.ll Normal file
View File

@ -0,0 +1,14 @@
; RUN: llc < %s -march=nvptx64 -mcpu=sm_35 | FileCheck %s
declare <2 x float> @bar(<2 x float> %input)
define void @foo(<2 x float> %input, <2 x float>* %output) {
; CHECK-LABEL: @foo
entry:
%call = tail call <2 x float> @bar(<2 x float> %input)
; CHECK: .param .align 8 .b8 retval0[8];
; CHECK: ld.param.v2.f32 {[[ELEM1:%f[0-9]+]], [[ELEM2:%f[0-9]+]]}, [retval0+0];
store <2 x float> %call, <2 x float>* %output, align 8
; CHECK: st.v2.f32 [{{%rd[0-9]+}}], {[[ELEM1]], [[ELEM2]]}
ret void
}