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65 lines
2.2 KiB
Diff
65 lines
2.2 KiB
Diff
Pull in r217410 from upstream llvm trunk (by Bob Wilson):
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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
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Legal, whereas with SSE2 it would return Expand. And since the Target
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doesn't seem to actually handle a truncstore for double -> float, it
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would just output a store of a full double in the space for a float
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hence overwriting other bits on the stack.
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Patch by Luqman Aden!
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This should fix clang -O0 on i386 assigning garbage to floats, in
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certain scenarios.
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Introduced here: http://svnweb.freebsd.org/changeset/base/271597
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Index: lib/Target/X86/X86ISelLowering.cpp
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===================================================================
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--- lib/Target/X86/X86ISelLowering.cpp
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+++ lib/Target/X86/X86ISelLowering.cpp
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@@ -316,6 +316,8 @@ void X86TargetLowering::resetOperationActions() {
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setTruncStoreAction(MVT::i32, MVT::i8 , Expand);
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setTruncStoreAction(MVT::i16, MVT::i8, Expand);
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+ setTruncStoreAction(MVT::f64, MVT::f32, Expand);
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+
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// SETOEQ and SETUNE require checking two conditions.
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setCondCodeAction(ISD::SETOEQ, MVT::f32, Expand);
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setCondCodeAction(ISD::SETOEQ, MVT::f64, Expand);
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@@ -1043,8 +1045,6 @@ void X86TargetLowering::resetOperationActions() {
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AddPromotedToType (ISD::SELECT, VT, MVT::v2i64);
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}
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- setTruncStoreAction(MVT::f64, MVT::f32, Expand);
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-
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// Custom lower v2i64 and v2f64 selects.
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setOperationAction(ISD::LOAD, MVT::v2f64, Legal);
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setOperationAction(ISD::LOAD, MVT::v2i64, Legal);
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Index: test/CodeGen/X86/dont-trunc-store-double-to-float.ll
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===================================================================
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--- test/CodeGen/X86/dont-trunc-store-double-to-float.ll
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+++ test/CodeGen/X86/dont-trunc-store-double-to-float.ll
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@@ -0,0 +1,20 @@
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+; RUN: llc -march=x86 < %s | FileCheck %s
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+
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+; CHECK-LABEL: @bar
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+; CHECK: movl $1074339512,
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+; CHECK: movl $1374389535,
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+; CHECK: movl $1078523331,
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+define void @bar() unnamed_addr {
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+entry-block:
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+ %a = alloca double
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+ %b = alloca float
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+
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+ store double 3.140000e+00, double* %a
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+ %0 = load double* %a
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+
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+ %1 = fptrunc double %0 to float
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+
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+ store float %1, float* %b
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+
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+ ret void
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+}
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