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Add a constant folding of casts from zero to zero. Fixes PR9011!

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While here, I'd like to complain about how vector is not an aggregate type
according to llvm::Type::isAggregateType(), but they're listed under aggregate
types in the LangRef and zero vectors are stored as ConstantAggregateZero.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123956 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2011-01-21 01:12:09 +00:00
parent d7e3cc840b
commit 4c93a0f092
2 changed files with 39 additions and 0 deletions
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4
lib/VMCore/ConstantFold.cpp
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@@ -511,10 +511,14 @@ Constant *llvm::ConstantFoldCastInstruction(unsigned opc, Constant *V,
return Constant::getNullValue(DestTy); return Constant::getNullValue(DestTy);
return UndefValue::get(DestTy); return UndefValue::get(DestTy);
} }
// No compile-time operations on this type yet. // No compile-time operations on this type yet.
if (V->getType()->isPPC_FP128Ty() || DestTy->isPPC_FP128Ty()) if (V->getType()->isPPC_FP128Ty() || DestTy->isPPC_FP128Ty())
return 0; return 0;
if (V->isNullValue() && !DestTy->isX86_MMXTy())
return Constant::getNullValue(DestTy);
// If the cast operand is a constant expression, there's a few things we can // If the cast operand is a constant expression, there's a few things we can
// do to try to simplify it. // do to try to simplify it.
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) { if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {

35
test/Transforms/ConstProp/constant-expr.ll
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@@ -65,3 +65,38 @@
; No check line. This used to crash llvm-as. ; No check line. This used to crash llvm-as.
@T6 = global <2 x i1> fcmp ole (<2 x float> fdiv (<2 x float> undef, <2 x float> <float 1.000000e+00, float 1.000000e+00>), <2 x float> zeroinitializer) @T6 = global <2 x i1> fcmp ole (<2 x float> fdiv (<2 x float> undef, <2 x float> <float 1.000000e+00, float 1.000000e+00>), <2 x float> zeroinitializer)
; PR9011
@pr9011_1 = constant <4 x i32> zext (<4 x i8> zeroinitializer to <4 x i32>)
; CHECK: pr9011_1 = constant <4 x i32> zeroinitializer
@pr9011_2 = constant <4 x i32> sext (<4 x i8> zeroinitializer to <4 x i32>)
; CHECK: pr9011_2 = constant <4 x i32> zeroinitializer
@pr9011_3 = constant <4 x i32> bitcast (<16 x i8> zeroinitializer to <4 x i32>)
; CHECK: pr9011_3 = constant <4 x i32> zeroinitializer
@pr9011_4 = constant <4 x float> uitofp (<4 x i8> zeroinitializer to <4 x float>)
; CHECK: pr9011_4 = constant <4 x float> zeroinitializer
@pr9011_5 = constant <4 x float> sitofp (<4 x i8> zeroinitializer to <4 x float>)
; CHECK: pr9011_5 = constant <4 x float> zeroinitializer
@pr9011_6 = constant <4 x i32> fptosi (<4 x float> zeroinitializer to <4 x i32>)
; CHECK: pr9011_6 = constant <4 x i32> zeroinitializer
@pr9011_7 = constant <4 x i32> fptoui (<4 x float> zeroinitializer to <4 x i32>)
; CHECK: pr9011_7 = constant <4 x i32> zeroinitializer
@pr9011_8 = constant <4 x float> fptrunc (<4 x double> zeroinitializer to <4 x float>)
; CHECK: pr9011_8 = constant <4 x float> zeroinitializer
@pr9011_9 = constant <4 x double> fpext (<4 x float> zeroinitializer to <4 x double>)
; CHECK: pr9011_9 = constant <4 x double> zeroinitializer
@pr9011_10 = constant <4 x double> bitcast (i256 0 to <4 x double>)
; CHECK: pr9011_10 = constant <4 x double> zeroinitializer
@pr9011_11 = constant <4 x float> bitcast (i128 0 to <4 x float>)
; CHECK: pr9011_11 = constant <4 x float> zeroinitializer
@pr9011_12 = constant <4 x i32> bitcast (i128 0 to <4 x i32>)
; CHECK: pr9011_12 = constant <4 x i32> zeroinitializer
@pr9011_13 = constant i256 bitcast (<4 x double> zeroinitializer to i256)
; CHECK: pr9011_13 = constant i256 0
@pr9011_14 = constant i128 bitcast (<4 x float> zeroinitializer to i128)
; CHECK: pr9011_14 = constant i128 0
@pr9011_15 = constant i128 bitcast (<4 x i32> zeroinitializer to i128)
; CHECK: pr9011_15 = constant i128 0