Date: Sun, 14 Sep 2014 18:50:38 +0000 (UTC) From: Dimitry Andric <dim@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r271597 - head/contrib/llvm/lib/Target/X86 Message-ID: <201409141850.s8EIoc4V064176@svn.freebsd.org>
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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: cebd@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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