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