| ; RUN: opt < %s -S -passes=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, ptr @a.0 |
| %0 = load i32, ptr @a, 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, ptr @b.0 |
| %0 = load i32, ptr getelementptr inbounds ({i32, i32}, ptr @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, ptr @a.0 |
| store i32 1, ptr @a, align 4 |
| ; This store can be removed, because the second element of @a is never read. |
| ; CHECK-NOT: store i32 2, ptr @a.1 |
| store i32 2, ptr getelementptr inbounds ([2 x i32], ptr @a, i32 0, i32 1), align 4 |
| |
| ; This store uses the split global, but cannot be constant-propagated away. |
| ; CHECK: store i32 3, ptr @b.0 |
| store i32 3, ptr getelementptr inbounds ({i32, i32}, ptr @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, ptr @b.1 |
| store i32 4, ptr getelementptr inbounds ({i32, i32}, ptr @b, i32 0, i32 1), align 4 |
| ret void |
| } |