Author: dim
Date: Sun Sep 14 18:50:38 2014
New Revision: 271597
URL: http://svnweb.freebsd.org/changeset/base/271597
Log:
Pull in r217410 from upstream llvm trunk (by Bob Wilson):
Set trunc store action to Expand for all X86 targets.
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!
This should fix clang -O0 on i386 assigning garbage to floats, in
certain scenarios.
PR: 187437
Submitted by: c...@gmail.com
Obtained from: http://llvm.org/viewvc/llvm-project?rev=217410&view=rev
MFC after: 3 days
Modified:
head/contrib/llvm/lib/Target/X86/X86ISelLowering.cpp
Modified: head/contrib/llvm/lib/Target/X86/X86ISelLowering.cpp
==============================================================================
--- head/contrib/llvm/lib/Target/X86/X86ISelLowering.cpp Sun Sep 14
18:07:55 2014 (r271596)
+++ head/contrib/llvm/lib/Target/X86/X86ISelLowering.cpp Sun Sep 14
18:50:38 2014 (r271597)
@@ -300,6 +300,8 @@ void X86TargetLowering::resetOperationAc
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);
@@ -1011,8 +1013,6 @@ void X86TargetLowering::resetOperationAc
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);
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