svn commit: r271739 - stable/10/contrib/llvm/lib/Target/X86

[Dimitry Andric]

Author: dim
Date: Thu Sep 18 06:34:27 2014
New Revision: 271739
URL: http://svnweb.freebsd.org/changeset/base/271739

Log:
  MFC r271597:
  
  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:	cebd at gmail.com
  Approved by:	re (marius)
  Obtained from:	http://llvm.org/viewvc/llvm-project?rev=217410&view=rev

Modified:
  stable/10/contrib/llvm/lib/Target/X86/X86ISelLowering.cpp
Directory Properties:
  stable/10/   (props changed)

Modified: stable/10/contrib/llvm/lib/Target/X86/X86ISelLowering.cpp
==============================================================================
--- stable/10/contrib/llvm/lib/Target/X86/X86ISelLowering.cpp	Thu Sep 18 05:43:19 2014	(r271738)
+++ stable/10/contrib/llvm/lib/Target/X86/X86ISelLowering.cpp	Thu Sep 18 06:34:27 2014	(r271739)
@@ -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);