-; Zero byte allocas should be deleted.
+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: llvm-as < %s | opt -instcombine | llvm-dis | \
-; RUN: not grep alloca
+; 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 )
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]
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
+}
+
+; PR14371
+%opaque_type = type opaque
+%real_type = type { { i32, i32* } }
+
+@opaque_global = external constant %opaque_type, align 4
+
+define void @test7() {
+entry:
+ %0 = alloca %real_type, align 4
+ %1 = bitcast %real_type* %0 to i8*
+ call void @llvm.memcpy.p0i8.p0i8.i32(i8* %1, i8* bitcast (%opaque_type* @opaque_global to i8*), i32 8, i32 1, i1 false)
+ ret void
+}
+
+declare void @llvm.memcpy.p0i8.p0i8.i32(i8* nocapture, i8* nocapture, i32, i32, i1) nounwind