forked from OSchip/llvm-project
97 lines
2.5 KiB
LLVM
97 lines
2.5 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"
|
|
|
|
; RUN: opt < %s -instcombine -S | FileCheck %s
|
|
; END.
|
|
|
|
declare void @use(...)
|
|
|
|
@int = global i32 zeroinitializer
|
|
|
|
; Zero byte allocas should be merged if they can't be deleted.
|
|
; CHECK: @test
|
|
; CHECK: alloca
|
|
; CHECK-NOT: alloca
|
|
define void @test() {
|
|
%X = alloca [0 x i32] ; <[0 x i32]*> [#uses=1]
|
|
call void (...)* @use( [0 x i32]* %X )
|
|
%Y = alloca i32, i32 0 ; <i32*> [#uses=1]
|
|
call void (...)* @use( i32* %Y )
|
|
%Z = alloca { } ; <{ }*> [#uses=1]
|
|
call void (...)* @use( { }* %Z )
|
|
%size = load i32* @int
|
|
%A = alloca {{}}, i32 %size
|
|
call void (...)* @use( {{}}* %A )
|
|
ret void
|
|
}
|
|
|
|
; Zero byte allocas should be deleted.
|
|
; CHECK: @test2
|
|
; CHECK-NOT: alloca
|
|
define void @test2() {
|
|
%A = alloca i32 ; <i32*> [#uses=1]
|
|
store i32 123, i32* %A
|
|
ret void
|
|
}
|
|
|
|
; Zero byte allocas should be deleted.
|
|
; CHECK: @test3
|
|
; CHECK-NOT: alloca
|
|
define void @test3() {
|
|
%A = alloca { i32 } ; <{ i32 }*> [#uses=1]
|
|
%B = getelementptr { i32 }* %A, i32 0, i32 0 ; <i32*> [#uses=1]
|
|
store i32 123, i32* %B
|
|
ret void
|
|
}
|
|
|
|
; CHECK: @test4
|
|
; CHECK: = zext i32 %n to i64
|
|
; CHECK: %A = alloca i32, i64 %
|
|
define i32* @test4(i32 %n) {
|
|
%A = alloca i32, i32 %n
|
|
ret i32* %A
|
|
}
|
|
|
|
; Allocas which are only used by GEPs, bitcasts, and stores (transitively)
|
|
; should be deleted.
|
|
define void @test5() {
|
|
; CHECK: @test5
|
|
; CHECK-NOT: alloca
|
|
; CHECK-NOT: store
|
|
; CHECK: ret
|
|
|
|
entry:
|
|
%a = alloca { i32 }
|
|
%b = alloca i32*
|
|
%a.1 = getelementptr { i32 }* %a, i32 0, i32 0
|
|
store i32 123, i32* %a.1
|
|
store i32* %a.1, i32** %b
|
|
%b.1 = bitcast i32** %b to i32*
|
|
store i32 123, i32* %b.1
|
|
%a.2 = getelementptr { i32 }* %a, i32 0, i32 0
|
|
store atomic i32 2, i32* %a.2 unordered, align 4
|
|
%a.3 = getelementptr { i32 }* %a, i32 0, i32 0
|
|
store atomic i32 3, i32* %a.3 release, align 4
|
|
%a.4 = getelementptr { i32 }* %a, i32 0, i32 0
|
|
store atomic i32 4, i32* %a.4 seq_cst, align 4
|
|
ret void
|
|
}
|
|
|
|
declare void @f(i32* %p)
|
|
|
|
; Check that we don't delete allocas in some erroneous cases.
|
|
define void @test6() {
|
|
; CHECK: @test6
|
|
; CHECK-NOT: ret
|
|
; CHECK: alloca
|
|
; CHECK-NEXT: alloca
|
|
; CHECK: ret
|
|
|
|
entry:
|
|
%a = alloca { i32 }
|
|
%b = alloca i32
|
|
%a.1 = getelementptr { i32 }* %a, i32 0, i32 0
|
|
store volatile i32 123, i32* %a.1
|
|
tail call void @f(i32* %b)
|
|
ret void
|
|
}
|