mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-17 03:07:06 +00:00
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
|
|
; 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
|
|
}
|
|
|