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Set trunc store action to Expand for all X86 targets.

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When compiling without SSE2, isTruncStoreLegal(F64, F32) would return Legal, whereas with SSE2 it would return Expand. And since the Target doesn't seem to actually handle a truncstore for double -> float, it would just output a store of a full double in the space for a float hence overwriting other bits on the stack.

Patch by Luqman Aden!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217410 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson 2014-09-09 01:13:36 +00:00
parent 0acb48923d
commit 086832979b
2 changed files with 22 additions and 2 deletions
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4
lib/Target/X86/X86ISelLowering.cpp
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@ -317,6 +317,8 @@ void X86TargetLowering::resetOperationActions() {
setTruncStoreAction(MVT::i32, MVT::i8 , Expand);
setTruncStoreAction(MVT::i16, MVT::i8, Expand);
setTruncStoreAction(MVT::f64, MVT::f32, Expand);
// SETOEQ and SETUNE require checking two conditions.
setCondCodeAction(ISD::SETOEQ, MVT::f32, Expand);
setCondCodeAction(ISD::SETOEQ, MVT::f64, Expand);
@ -1057,8 +1059,6 @@ void X86TargetLowering::resetOperationActions() {
AddPromotedToType (ISD::SELECT, VT, MVT::v2i64);
}
setTruncStoreAction(MVT::f64, MVT::f32, Expand);
// Custom lower v2i64 and v2f64 selects.
setOperationAction(ISD::LOAD, MVT::v2f64, Legal);
setOperationAction(ISD::LOAD, MVT::v2i64, Legal);

20
test/CodeGen/X86/dont-trunc-store-double-to-float.ll Normal file
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@ -0,0 +1,20 @@
; RUN: llc -march=x86 < %s | FileCheck %s
; CHECK-LABEL: @bar
; CHECK: movl $1074339512,
; CHECK: movl $1374389535,
; CHECK: movl $1078523331,
define void @bar() unnamed_addr {
entry-block:
%a = alloca double
%b = alloca float
store double 3.140000e+00, double* %a
%0 = load double* %a
%1 = fptrunc double %0 to float
store float %1, float* %b
ret void
}