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Generalize the transform that boosts GEP indices to the size of a pointer to

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also do it for vectors of pointers.

llvm-svn: 167354
This commit is contained in:
Duncan Sands 2012-11-03 11:44:17 +00:00
parent 1bfa522bfe
commit 626552af21
2 changed files with 13 additions and 2 deletions
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4
lib/Transforms/InstCombine/InstructionCombining.cpp
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@ -1055,7 +1055,7 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
// by multiples of a zero size type with zero.
if (TD) {
bool MadeChange = false;
Type *IntPtrTy = TD->getIntPtrType(GEP.getContext());
Type *IntPtrTy = TD->getIntPtrType(GEP.getPointerOperandType());
gep_type_iterator GTI = gep_type_begin(GEP);
for (User::op_iterator I = GEP.op_begin() + 1, E = GEP.op_end();
@ -1074,7 +1074,7 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
}
Type *IndexTy = (*I)->getType();
if (IndexTy != IntPtrTy && !IndexTy->isVectorTy()) {
if (IndexTy != IntPtrTy) {
// If we are using a wider index than needed for this platform, shrink
// it to what we need. If narrower, sign-extend it to what we need.
// This explicit cast can make subsequent optimizations more obvious.

11
test/Transforms/InstCombine/vector_gep2.ll Normal file
View File

@ -0,0 +1,11 @@
; 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-S128"
target triple = "x86_64-unknown-linux-gnu"
define <2 x i8*> @testa(<2 x i8*> %a) {
; CHECK: @testa
%g = getelementptr <2 x i8*> %a, <2 x i32> <i32 0, i32 1>
; CHECK: getelementptr <2 x i8*> %a, <2 x i64> <i64 0, i64 1>
ret <2 x i8*> %g
}