llvm-6502/test/Transforms/InstCombine/cast_ptr.ll

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; Tests to make sure elimination of casts is working correctly
; RUN: llvm-as < %s | opt -instcombine | llvm-dis | FileCheck %s
target datalayout = "p:32:32"
; This shouldn't convert to getelementptr because the relationship
; between the arithmetic and the layout of allocated memory is
; entirely unknown.
; CHECK: @test1
; CHECK: ptrtoint
; CHECK: add
; CHECK: inttoptr
define i8* @test1(i8* %t) {
%tmpc = ptrtoint i8* %t to i32 ; <i32> [#uses=1]
%tmpa = add i32 %tmpc, 32 ; <i32> [#uses=1]
%tv = inttoptr i32 %tmpa to i8* ; <i8*> [#uses=1]
ret i8* %tv
}
; These casts should be folded away.
; CHECK: @test2
; CHECK: icmp eq i8* %a, %b
define i1 @test2(i8* %a, i8* %b) {
%tmpa = ptrtoint i8* %a to i32 ; <i32> [#uses=1]
%tmpb = ptrtoint i8* %b to i32 ; <i32> [#uses=1]
%r = icmp eq i32 %tmpa, %tmpb ; <i1> [#uses=1]
ret i1 %r
}