ee5d5e19f9
Arguments to an indirect call is by definition outside the SCC, but there's no reason we can't use locally defined facts on the call site. This also has the nice effect of further simplifying the code. Differential Revision: https://reviews.llvm.org/D116118
188 lines
5.7 KiB
LLVM
188 lines
5.7 KiB
LLVM
; RUN: opt < %s -function-attrs -S | FileCheck %s
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; RUN: opt < %s -aa-pipeline=basic-aa -passes='cgscc(function-attrs)' -S | FileCheck %s
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@x = global i32 0
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declare void @test1_1(i8* %x1_1, i8* nocapture readonly %y1_1, ...)
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; CHECK: define void @test1_2(i8* %x1_2, i8* nocapture readonly %y1_2, i8* %z1_2)
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define void @test1_2(i8* %x1_2, i8* %y1_2, i8* %z1_2) {
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call void (i8*, i8*, ...) @test1_1(i8* %x1_2, i8* %y1_2, i8* %z1_2)
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store i32 0, i32* @x
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ret void
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}
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; CHECK: define i8* @test2(i8* readnone returned %p)
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define i8* @test2(i8* %p) {
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store i32 0, i32* @x
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ret i8* %p
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}
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; CHECK: define i1 @test3(i8* readnone %p, i8* readnone %q)
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define i1 @test3(i8* %p, i8* %q) {
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%A = icmp ult i8* %p, %q
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ret i1 %A
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}
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declare void @test4_1(i8* nocapture) readonly
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; CHECK: define void @test4_2(i8* nocapture readonly %p)
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define void @test4_2(i8* %p) {
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call void @test4_1(i8* %p)
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ret void
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}
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; CHECK: define void @test5(i8** nocapture writeonly %p, i8* %q)
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; Missed optz'n: we could make %q readnone, but don't break test6!
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define void @test5(i8** %p, i8* %q) {
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store i8* %q, i8** %p
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ret void
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}
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declare void @test6_1()
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; CHECK: define void @test6_2(i8** nocapture writeonly %p, i8* %q)
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; This is not a missed optz'n.
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define void @test6_2(i8** %p, i8* %q) {
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store i8* %q, i8** %p
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call void @test6_1()
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ret void
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}
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; CHECK: define void @test7_1(i32* nocapture inalloca(i32) %a)
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; inalloca parameters are always considered written
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define void @test7_1(i32* inalloca(i32) %a) {
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ret void
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}
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; CHECK: define void @test7_2(i32* nocapture preallocated(i32) %a)
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; preallocated parameters are always considered written
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define void @test7_2(i32* preallocated(i32) %a) {
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ret void
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}
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; CHECK: define i32* @test8_1(i32* readnone returned %p)
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define i32* @test8_1(i32* %p) {
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entry:
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ret i32* %p
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}
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; CHECK: define void @test8_2(i32* writeonly %p)
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define void @test8_2(i32* %p) {
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entry:
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%call = call i32* @test8_1(i32* %p)
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store i32 10, i32* %call, align 4
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ret void
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}
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; CHECK: declare void @llvm.masked.scatter
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declare void @llvm.masked.scatter.v4i32.v4p0i32(<4 x i32>%val, <4 x i32*>, i32, <4 x i1>)
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; CHECK-NOT: readnone
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; CHECK-NOT: readonly
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; CHECK: define void @test9
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define void @test9(<4 x i32*> %ptrs, <4 x i32>%val) {
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call void @llvm.masked.scatter.v4i32.v4p0i32(<4 x i32>%val, <4 x i32*> %ptrs, i32 4, <4 x i1><i1 true, i1 false, i1 true, i1 false>)
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ret void
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}
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; CHECK: declare <4 x i32> @llvm.masked.gather
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declare <4 x i32> @llvm.masked.gather.v4i32.v4p0i32(<4 x i32*>, i32, <4 x i1>, <4 x i32>)
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; CHECK: readonly
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; CHECK: define <4 x i32> @test10
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define <4 x i32> @test10(<4 x i32*> %ptrs) {
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%res = call <4 x i32> @llvm.masked.gather.v4i32.v4p0i32(<4 x i32*> %ptrs, i32 4, <4 x i1><i1 true, i1 false, i1 true, i1 false>, <4 x i32>undef)
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ret <4 x i32> %res
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}
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; CHECK: declare <4 x i32> @test11_1
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declare <4 x i32> @test11_1(<4 x i32*>) argmemonly nounwind readonly
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; CHECK: readonly
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; CHECK-NOT: readnone
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; CHECK: define <4 x i32> @test11_2
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define <4 x i32> @test11_2(<4 x i32*> %ptrs) {
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%res = call <4 x i32> @test11_1(<4 x i32*> %ptrs)
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ret <4 x i32> %res
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}
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declare <4 x i32> @test12_1(<4 x i32*>) argmemonly nounwind
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; CHECK-NOT: readnone
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; CHECK: define <4 x i32> @test12_2
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define <4 x i32> @test12_2(<4 x i32*> %ptrs) {
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%res = call <4 x i32> @test12_1(<4 x i32*> %ptrs)
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ret <4 x i32> %res
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}
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; CHECK: define i32 @volatile_load(
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; CHECK-NOT: readonly
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; CHECK: ret
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define i32 @volatile_load(i32* %p) {
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%load = load volatile i32, i32* %p
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ret i32 %load
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}
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declare void @escape_readnone_ptr(i8** %addr, i8* readnone %ptr)
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declare void @escape_readonly_ptr(i8** %addr, i8* readonly %ptr)
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; The argument pointer %escaped_then_written cannot be marked readnone/only even
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; though the only direct use, in @escape_readnone_ptr/@escape_readonly_ptr,
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; is marked as readnone/only. However, the functions can write the pointer into
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; %addr, causing the store to write to %escaped_then_written.
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;
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; CHECK: define void @unsound_readnone(i8* nocapture readnone %ignored, i8* %escaped_then_written)
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; CHECK: define void @unsound_readonly(i8* nocapture readnone %ignored, i8* %escaped_then_written)
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;
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define void @unsound_readnone(i8* %ignored, i8* %escaped_then_written) {
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%addr = alloca i8*
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call void @escape_readnone_ptr(i8** %addr, i8* %escaped_then_written)
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%addr.ld = load i8*, i8** %addr
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store i8 0, i8* %addr.ld
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ret void
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}
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define void @unsound_readonly(i8* %ignored, i8* %escaped_then_written) {
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%addr = alloca i8*
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call void @escape_readonly_ptr(i8** %addr, i8* %escaped_then_written)
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%addr.ld = load i8*, i8** %addr
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store i8 0, i8* %addr.ld
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ret void
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}
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; CHECK: define void @fptr_test1a(i8* nocapture readnone %p, void (i8*)* nocapture readonly %f)
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define void @fptr_test1a(i8* %p, void (i8*)* %f) {
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call void %f(i8* nocapture readnone %p)
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ret void
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}
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; CHECK: define void @fptr_test1b(i8* %p, void (i8*)* nocapture readonly %f)
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define void @fptr_test1b(i8* %p, void (i8*)* %f) {
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; Can't infer readnone here because call might capture %p
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call void %f(i8* readnone %p)
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ret void
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}
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; CHECK: define void @fptr_test1c(i8* readnone %p, void (i8*)* nocapture readonly %f)
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define void @fptr_test1c(i8* %p, void (i8*)* %f) {
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call void %f(i8* readnone %p) readonly
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ret void
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}
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; CHECK: define void @fptr_test2a(i8* nocapture readonly %p, void (i8*)* nocapture readonly %f)
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define void @fptr_test2a(i8* %p, void (i8*)* %f) {
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call void %f(i8* nocapture readonly %p)
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ret void
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}
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; CHECK: define void @fptr_test2b(i8* %p, void (i8*)* nocapture readonly %f)
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define void @fptr_test2b(i8* %p, void (i8*)* %f) {
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; Can't infer readonly here because call might capture %p
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call void %f(i8* readonly %p)
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ret void
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}
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; CHECK: define void @fptr_test2c(i8* readonly %p, void (i8*)* nocapture readonly %f)
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define void @fptr_test2c(i8* %p, void (i8*)* %f) {
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call void %f(i8* readonly %p) readonly
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ret void
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}
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