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Add constant folding support for bitcasts of splat vectors to integers.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138206 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem 2011-08-20 14:02:29 +00:00
parent 77c108241a
commit 1c9fe0361b
2 changed files with 20 additions and 2 deletions
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12
lib/Analysis/ConstantFolding.cpp
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@ -46,7 +46,16 @@ using namespace llvm;
static Constant *FoldBitCast(Constant *C, Type *DestTy,
const TargetData &TD) {
// This only handles casts to vectors currently.
ConstantVector *CV = dyn_cast<ConstantVector>(C);
IntegerType *IntVTy = dyn_cast<IntegerType>(DestTy);
// When casting vectors to scalar integers, catch the
// obvious splat cases.
if (IntVTy && CV) {
if (CV->isNullValue()) return ConstantInt::getNullValue(IntVTy);
if (CV->isAllOnesValue()) return ConstantInt::getAllOnesValue(IntVTy);
}
// The code below only handles casts to vectors currently.
VectorType *DestVTy = dyn_cast<VectorType>(DestTy);
if (DestVTy == 0)
return ConstantExpr::getBitCast(C, DestTy);
@ -59,7 +68,6 @@ static Constant *FoldBitCast(Constant *C, Type *DestTy,
}
// If this is a bitcast from constant vector -> vector, fold it.
ConstantVector *CV = dyn_cast<ConstantVector>(C);
if (CV == 0)
return ConstantExpr::getBitCast(C, DestTy);

10
test/Transforms/InstCombine/bitcast.ll
View File

@ -1,5 +1,8 @@
; RUN: opt < %s -instcombine -S | FileCheck %s
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
target triple = "x86_64-apple-darwin10.0.0"
; Bitcasts between vectors and scalars are valid.
; PR4487
define i32 @test1(i64 %a) {
@ -103,3 +106,10 @@ define <2 x float> @test6(float %A){
; CHECK-NEXT: insertelement <2 x float> <float 4.200000e+01, float undef>, float %A, i32 1
; CHECK: ret
}
define i64 @ISPC0(i64 %in) {
%out = and i64 %in, xor (i64 bitcast (<4 x i16> <i16 -1, i16 -1, i16 -1, i16 -1> to i64), i64 -1)
ret i64 %out
; CHECK: @ISPC0
; CHECK: ret i64 0
}