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f241174421
Getelementptrs that are defined to wrap are virtually useless to optimization, and getelementptrs that are undefined on any kind of overflow are too restrictive -- it's difficult to ensure that all intermediate addresses are within bounds. I'm going to take a different approach. Remove a few optimizations that depended on this flag. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76437 91177308-0d34-0410-b5e6-96231b3b80d8
30 lines
958 B
LLVM
30 lines
958 B
LLVM
; Tests to make sure elimination of casts is working correctly
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; RUN: llvm-as < %s | opt -instcombine | llvm-dis | FileCheck %s
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target datalayout = "p:32:32"
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; This shouldn't convert to getelementptr because the relationship
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; between the arithmetic and the layout of allocated memory is
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; entirely unknown.
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; CHECK: @test1
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; CHECK: ptrtoint
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; CHECK: add
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; CHECK: inttoptr
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define i8* @test1(i8* %t) {
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%tmpc = ptrtoint i8* %t to i32 ; <i32> [#uses=1]
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%tmpa = add i32 %tmpc, 32 ; <i32> [#uses=1]
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%tv = inttoptr i32 %tmpa to i8* ; <i8*> [#uses=1]
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ret i8* %tv
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}
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; These casts should be folded away.
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; CHECK: @test2
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; CHECK: icmp eq i8* %a, %b
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define i1 @test2(i8* %a, i8* %b) {
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%tmpa = ptrtoint i8* %a to i32 ; <i32> [#uses=1]
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%tmpb = ptrtoint i8* %b to i32 ; <i32> [#uses=1]
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%r = icmp eq i32 %tmpa, %tmpb ; <i1> [#uses=1]
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ret i1 %r
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}
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