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113 lines
2.9 KiB
LLVM
113 lines
2.9 KiB
LLVM
target datalayout = "E-p:64:64:64-a0:0:8-f32:32:32-f64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-v64:64:64-v128:128:128"
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; RUN: opt < %s -instcombine -S | FileCheck %s
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; END.
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declare void @use(...)
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@int = global i32 zeroinitializer
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; Zero byte allocas should be merged if they can't be deleted.
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; CHECK: @test
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; CHECK: alloca
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; CHECK-NOT: alloca
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define void @test() {
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%X = alloca [0 x i32] ; <[0 x i32]*> [#uses=1]
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call void (...)* @use( [0 x i32]* %X )
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%Y = alloca i32, i32 0 ; <i32*> [#uses=1]
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call void (...)* @use( i32* %Y )
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%Z = alloca { } ; <{ }*> [#uses=1]
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call void (...)* @use( { }* %Z )
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%size = load i32* @int
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%A = alloca {{}}, i32 %size
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call void (...)* @use( {{}}* %A )
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ret void
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}
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; Zero byte allocas should be deleted.
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; CHECK: @test2
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; CHECK-NOT: alloca
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define void @test2() {
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%A = alloca i32 ; <i32*> [#uses=1]
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store i32 123, i32* %A
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ret void
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}
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; Zero byte allocas should be deleted.
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; CHECK: @test3
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; CHECK-NOT: alloca
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define void @test3() {
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%A = alloca { i32 } ; <{ i32 }*> [#uses=1]
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%B = getelementptr { i32 }* %A, i32 0, i32 0 ; <i32*> [#uses=1]
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store i32 123, i32* %B
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ret void
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}
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; CHECK: @test4
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; CHECK: = zext i32 %n to i64
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; CHECK: %A = alloca i32, i64 %
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define i32* @test4(i32 %n) {
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%A = alloca i32, i32 %n
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ret i32* %A
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}
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; Allocas which are only used by GEPs, bitcasts, and stores (transitively)
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; should be deleted.
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define void @test5() {
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; CHECK: @test5
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; CHECK-NOT: alloca
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; CHECK-NOT: store
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; CHECK: ret
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entry:
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%a = alloca { i32 }
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%b = alloca i32*
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%a.1 = getelementptr { i32 }* %a, i32 0, i32 0
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store i32 123, i32* %a.1
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store i32* %a.1, i32** %b
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%b.1 = bitcast i32** %b to i32*
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store i32 123, i32* %b.1
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%a.2 = getelementptr { i32 }* %a, i32 0, i32 0
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store atomic i32 2, i32* %a.2 unordered, align 4
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%a.3 = getelementptr { i32 }* %a, i32 0, i32 0
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store atomic i32 3, i32* %a.3 release, align 4
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%a.4 = getelementptr { i32 }* %a, i32 0, i32 0
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store atomic i32 4, i32* %a.4 seq_cst, align 4
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ret void
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}
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declare void @f(i32* %p)
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; Check that we don't delete allocas in some erroneous cases.
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define void @test6() {
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; CHECK: @test6
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; CHECK-NOT: ret
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; CHECK: alloca
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; CHECK-NEXT: alloca
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; CHECK: ret
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entry:
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%a = alloca { i32 }
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%b = alloca i32
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%a.1 = getelementptr { i32 }* %a, i32 0, i32 0
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store volatile i32 123, i32* %a.1
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tail call void @f(i32* %b)
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ret void
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}
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; PR14371
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%opaque_type = type opaque
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%real_type = type { { i32, i32* } }
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@opaque_global = external constant %opaque_type, align 4
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define void @test7() {
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entry:
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%0 = alloca %real_type, align 4
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%1 = bitcast %real_type* %0 to i8*
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call void @llvm.memcpy.p0i8.p0i8.i32(i8* %1, i8* bitcast (%opaque_type* @opaque_global to i8*), i32 8, i32 1, i1 false)
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ret void
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}
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declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind
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