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https://github.com/RPCS3/llvm-mirror.git
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05b6860c6e
This is almost purely NFC, it just fits more obviously in the flow of the code now that we've standardized on the index different approach. The non-NFC bit is that because of canceling the VariableOffsets in the subtract, we can now handle the case where both sides involve a common variable offset. This isn't an "interesting" improvement; it just happens to fall out of the natural code structure. One subtle point - the placement of this above the BaseAlias check is important in the original code as this can return NoAlias even when we can't find a relation between the bases otherwise. Also added some enhancement TODOs noticed while understanding the existing code. Note: This is slightly different than the LGTMed version. I fixed the "inbounds" issue Nikita noticed with the original code in e6e5ef4 and rebased this to include the same fix. Differential Revision: https://reviews.llvm.org/D97520
164 lines
6.1 KiB
LLVM
164 lines
6.1 KiB
LLVM
; RUN: opt < %s -basic-aa -aa-eval -print-all-alias-modref-info -disable-output 2>&1 | FileCheck %s
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target datalayout = "e-m:e-p:32:32-f64:32:64-f80:32-n8:16:32-S128"
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target triple = "i386-unknown-linux-gnu"
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declare i32* @random.i32(i32* %ptr)
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declare i8* @random.i8(i32* %ptr)
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; CHECK-LABEL: Function: arr:
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; CHECK-DAG: MayAlias: i32* %alloca, i32* %p0
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; CHECK-DAG: NoAlias: i32* %alloca, i32* %p1
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define void @arr() {
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%alloca = alloca i32, i32 4
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%random = call i32* @random.i32(i32* %alloca)
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%p0 = getelementptr inbounds i32, i32* %random, i32 0
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%p1 = getelementptr inbounds i32, i32* %random, i32 1
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ret void
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}
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; CHECK-LABEL: Function: arg:
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; CHECK-DAG: MayAlias: i32* %arg, i32* %p0
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; CHECK-DAG: MayAlias: i32* %arg, i32* %p1
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define void @arg(i32* %arg) {
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%random = call i32* @random.i32(i32* %arg)
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%p0 = getelementptr inbounds i32, i32* %random, i32 0
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%p1 = getelementptr inbounds i32, i32* %random, i32 1
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ret void
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}
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@gv = global i32 1
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; CHECK-LABEL: Function: global:
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; CHECK-DAG: MayAlias: i32* %p0, i32* @gv
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; CHECK-DAG: NoAlias: i32* %p1, i32* @gv
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define void @global() {
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%random = call i32* @random.i32(i32* @gv)
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%p0 = getelementptr inbounds i32, i32* %random, i32 0
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%p1 = getelementptr inbounds i32, i32* %random, i32 1
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ret void
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}
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; CHECK-LABEL: Function: struct:
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; CHECK-DAG: MayAlias: i32* %f0, i32* %p0
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; CHECK-DAG: MayAlias: i32* %f1, i32* %p0
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; CHECK-DAG: NoAlias: i32* %f0, i32* %p1
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; CHECK-DAG: MayAlias: i32* %f1, i32* %p1
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%struct = type { i32, i32, i32 }
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define void @struct() {
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%alloca = alloca %struct
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%alloca.i32 = bitcast %struct* %alloca to i32*
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%random = call i32* @random.i32(i32* %alloca.i32)
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%f0 = getelementptr inbounds %struct, %struct* %alloca, i32 0, i32 0
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%f1 = getelementptr inbounds %struct, %struct* %alloca, i32 0, i32 1
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%p0 = getelementptr inbounds i32, i32* %random, i32 0
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%p1 = getelementptr inbounds i32, i32* %random, i32 1
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ret void
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}
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; CHECK-LABEL: Function: complex1:
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; CHECK-DAG: MayAlias: i32* %a2.0, i32* %r2.0
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; CHECK-DAG: NoAlias: i32* %a2.0, i32* %r2.1
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; CHECK-DAG: MayAlias: i32* %a2.0, i32* %r2.i
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; CHECK-DAG: MayAlias: i32* %a2.0, i32* %r2.1i
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; CHECK-DAG: NoAlias: i32* %a1, i32* %r2.0
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; CHECK-DAG: NoAlias: i32* %a1, i32* %r2.1
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; CHECK-DAG: MayAlias: i32* %a1, i32* %r2.i
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; CHECK-DAG: MayAlias: i32* %a1, i32* %r2.1i
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%complex = type { i32, i32, [4 x i32] }
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define void @complex1(i32 %i) {
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%alloca = alloca %complex
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%alloca.i32 = bitcast %complex* %alloca to i32*
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%r.i32 = call i32* @random.i32(i32* %alloca.i32)
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%random = bitcast i32* %r.i32 to %complex*
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%a1 = getelementptr inbounds %complex, %complex* %alloca, i32 0, i32 1
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%a2.0 = getelementptr inbounds %complex, %complex* %alloca, i32 0, i32 2, i32 0
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%r2.0 = getelementptr inbounds %complex, %complex* %random, i32 0, i32 2, i32 0
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%r2.1 = getelementptr inbounds %complex, %complex* %random, i32 0, i32 2, i32 1
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%r2.i = getelementptr inbounds %complex, %complex* %random, i32 0, i32 2, i32 %i
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%r2.1i = getelementptr inbounds i32, i32* %r2.1, i32 %i
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ret void
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}
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; CHECK-LABEL: Function: complex2:
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; CHECK-DAG: NoAlias: i32* %alloca, i32* %p120
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; CHECK-DAG: MayAlias: i32* %alloca, i32* %pi20
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; CHECK-DAG: MayAlias: i32* %alloca, i32* %pij1
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; CHECK-DAG: MayAlias: i32* %a3, i32* %pij1
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%inner = type { i32, i32 }
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%outer = type { i32, i32, [10 x %inner] }
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declare %outer* @rand_outer(i32* %p)
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define void @complex2(i32 %i, i32 %j) {
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%alloca = alloca i32, i32 128
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%a3 = getelementptr inbounds i32, i32* %alloca, i32 3
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%random = call %outer* @rand_outer(i32* %alloca)
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%p120 = getelementptr inbounds %outer, %outer* %random, i32 1, i32 2, i32 2, i32 0
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%pi20 = getelementptr inbounds %outer, %outer* %random, i32 %i, i32 2, i32 2, i32 0
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%pij1 = getelementptr inbounds %outer, %outer* %random, i32 %i, i32 2, i32 %j, i32 1
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ret void
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}
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; CHECK-LABEL: Function: pointer_offset:
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; CHECK-DAG: MayAlias: i32** %add.ptr, i32** %p1
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; CHECK-DAG: MayAlias: i32** %add.ptr, i32** %q2
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%struct.X = type { i32*, i32* }
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define i32 @pointer_offset(i32 signext %i, i32 signext %j, i32 zeroext %off) {
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entry:
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%i.addr = alloca i32
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%j.addr = alloca i32
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%x = alloca %struct.X
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store i32 %i, i32* %i.addr
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store i32 %j, i32* %j.addr
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%0 = bitcast %struct.X* %x to i8*
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%p1 = getelementptr inbounds %struct.X, %struct.X* %x, i32 0, i32 0
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store i32* %i.addr, i32** %p1
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%q2 = getelementptr inbounds %struct.X, %struct.X* %x, i32 0, i32 1
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store i32* %j.addr, i32** %q2
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%add.ptr = getelementptr inbounds i32*, i32** %q2, i32 %off
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%1 = load i32*, i32** %add.ptr
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%2 = load i32, i32* %1
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ret i32 %2
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}
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; CHECK-LABEL: Function: one_size_unknown:
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; CHECK: NoModRef: Ptr: i8* %p.minus1 <-> call void @llvm.memset.p0i8.i32(i8* %p, i8 0, i32 %size, i1 false)
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define void @one_size_unknown(i8* %p, i32 %size) {
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%p.minus1 = getelementptr inbounds i8, i8* %p, i32 -1
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call void @llvm.memset.p0i8.i32(i8* %p, i8 0, i32 %size, i1 false)
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ret void
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}
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; If part of the addressing is done with non-inbounds GEPs, we can't use
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; properties implied by the last gep w/the whole offset. In this case,
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; %random = %alloc - 4 bytes is well defined, and results in %step == %alloca,
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; leaving %p as an entirely inbounds gep pointing inside %alloca
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; CHECK-LABEL: Function: all_inbounds:
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; CHECK: MayAlias: i32* %alloca, i8* %p0
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; CHECK: MayAlias: i32* %alloca, i8* %p1
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define void @all_inbounds() {
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%alloca = alloca i32, i32 4
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%random = call i8* @random.i8(i32* %alloca)
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%p0 = getelementptr inbounds i8, i8* %random, i8 0
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%step = getelementptr i8, i8* %random, i8 4
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%p1 = getelementptr inbounds i8, i8* %step, i8 2
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ret void
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}
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; For all values of %x, %p0 and %p1 can't alias because %random would
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; have to be out of bounds (and thus a contradiction) for them to be equal.
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; CHECK-LABEL: Function: common_factor:
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; CHECK: NoAlias: i32* %p0, i32* %p1
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define void @common_factor(i32 %x) {
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%alloca = alloca i32, i32 4
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%random = call i8* @random.i8(i32* %alloca)
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%p0 = getelementptr inbounds i32, i32* %alloca, i32 %x
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%step = getelementptr inbounds i8, i8* %random, i8 4
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%step.bitcast = bitcast i8* %step to i32*
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%p1 = getelementptr inbounds i32, i32* %step.bitcast, i32 %x
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ret void
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}
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declare void @llvm.memset.p0i8.i32(i8*, i8, i32, i1)
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