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GlobalOpt currently merges stores into the initialisers of internal, externally_initialized globals, but should not do so as the value of the global may change between the initialiser and any code in the module being run. llvm-svn: 250035
38 lines
1.0 KiB
LLVM
38 lines
1.0 KiB
LLVM
; RUN: opt < %s -S -globalopt | FileCheck %s
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; This global is externally_initialized, which may modify the value between
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; it's static initializer and any code in this module being run, so the only
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; write to it cannot be merged into the static initialiser.
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; CHECK: @a = internal unnamed_addr externally_initialized global i32 undef
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@a = internal externally_initialized global i32 undef
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; This global is stored to by the external initialization, so cannot be
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; constant-propagated and removed, despite the fact that there are no writes
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; to it.
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; CHECK: @b = internal unnamed_addr externally_initialized global i32 undef
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@b = internal externally_initialized global i32 undef
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define void @foo() {
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; CHECK-LABEL: foo
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entry:
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; CHECK: store i32 42, i32* @a
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store i32 42, i32* @a
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ret void
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}
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define i32 @bar() {
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; CHECK-LABEL: bar
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entry:
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; CHECK: %val = load i32, i32* @a
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%val = load i32, i32* @a
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ret i32 %val
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}
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define i32 @baz() {
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; CHECK-LABEL: baz
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entry:
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; CHECK: %val = load i32, i32* @b
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%val = load i32, i32* @b
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ret i32 %val
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}
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