You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
51 lines
2.1 KiB
51 lines
2.1 KiB
; RUN: opt < %s -S -globalopt | FileCheck %s
|
|
|
|
; This global is externally_initialized, so if we split it into scalars we
|
|
; should keep that flag set on all of the new globals. This will prevent the
|
|
; store to @a[0] from being constant propagated to the load in @foo, but will not
|
|
; prevent @a[1] from being removed since it is dead.
|
|
; CHECK: @a.0 = internal unnamed_addr externally_initialized global i32 undef
|
|
; CHECK-NOT @a.1
|
|
@a = internal externally_initialized global [2 x i32] undef, align 4
|
|
; This is the same, but a struct rather than an array.
|
|
; CHECK: @b.0 = internal unnamed_addr externally_initialized global i32 undef
|
|
; CHECK-NOT @b.1
|
|
@b = internal externally_initialized global {i32, i32} undef, align 4
|
|
|
|
define i32 @foo() {
|
|
; CHECK-LABEL: define i32 @foo
|
|
entry:
|
|
; This load uses the split global, but cannot be constant-propagated away.
|
|
; CHECK: %0 = load i32, i32* @a.0
|
|
%0 = load i32, i32* getelementptr inbounds ([2 x i32], [2 x i32]* @a, i32 0, i32 0), align 4
|
|
ret i32 %0
|
|
}
|
|
|
|
define i32 @bar() {
|
|
; CHECK-LABEL: define i32 @bar
|
|
entry:
|
|
; This load uses the split global, but cannot be constant-propagated away.
|
|
; CHECK: %0 = load i32, i32* @b.0
|
|
%0 = load i32, i32* getelementptr inbounds ({i32, i32}, {i32, i32}* @b, i32 0, i32 0), align 4
|
|
ret i32 %0
|
|
}
|
|
|
|
define void @init() {
|
|
; CHECK-LABEL: define void @init
|
|
entry:
|
|
; This store uses the split global, but cannot be constant-propagated away.
|
|
; CHECK: store i32 1, i32* @a.0
|
|
store i32 1, i32* getelementptr inbounds ([2 x i32], [2 x i32]* @a, i32 0, i32 0), align 4
|
|
; This store can be removed, because the second element of @a is never read.
|
|
; CHECK-NOT: store i32 2, i32* @a.1
|
|
store i32 2, i32* getelementptr inbounds ([2 x i32], [2 x i32]* @a, i32 0, i32 1), align 4
|
|
|
|
; This store uses the split global, but cannot be constant-propagated away.
|
|
; CHECK: store i32 3, i32* @b.0
|
|
store i32 3, i32* getelementptr inbounds ({i32, i32}, {i32, i32}* @b, i32 0, i32 0), align 4
|
|
; This store can be removed, because the second element of @b is never read.
|
|
; CHECK-NOT: store i32 4, i32* @b.1
|
|
store i32 4, i32* getelementptr inbounds ({i32, i32}, {i32, i32}* @b, i32 0, i32 1), align 4
|
|
ret void
|
|
}
|