derek.holloway
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104 lines
2.7 KiB
LLVM
104 lines
2.7 KiB
LLVM
; RUN: opt -S -passes=globalopt < %s | FileCheck %s
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; CHECK: @llvm.global_ctors = appending global [1 x {{.*}}@_GLOBAL__I_c
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@llvm.global_ctors = appending global [3 x { i32, ptr, ptr }] [{ i32, ptr, ptr } { i32 65535, ptr @_GLOBAL__I_a, ptr null }, { i32, ptr, ptr } { i32 65535, ptr @_GLOBAL__I_b, ptr null }, { i32, ptr, ptr } { i32 65535, ptr @_GLOBAL__I_c, ptr null }]
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; CHECK: @tmp = local_unnamed_addr global i32 42
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; CHECK: @tmp2 = local_unnamed_addr global i32 42
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; CHECK: @tmp3 = global i32 42
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@tmp = global i32 0
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@tmp2 = global i32 0
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@tmp3 = global i32 0
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@ptrToTmp3 = global ptr null
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define i32 @TheAnswerToLifeTheUniverseAndEverything() {
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ret i32 42
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}
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define void @_GLOBAL__I_a() {
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enter:
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call void @_optimizable()
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call void @_not_optimizable()
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ret void
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}
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define void @_optimizable() {
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enter:
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%valptr = alloca i32
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%val = call i32 @TheAnswerToLifeTheUniverseAndEverything()
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store i32 %val, ptr @tmp
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store i32 %val, ptr %valptr
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%barr = call ptr @llvm.launder.invariant.group(ptr %valptr)
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%val2 = load i32, ptr %barr
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store i32 %val2, ptr @tmp2
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ret void
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}
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; We can't step through launder.invariant.group here, because that would change
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; this load in @usage_of_globals()
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; %val = load i32, ptr %ptrVal, !invariant.group !0
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; into
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; %val = load i32, ptr @tmp3, !invariant.group !0
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; and then we could assume that %val and %val2 to be the same, which coud be
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; false, because @changeTmp3ValAndCallBarrierInside() may change the value
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; of @tmp3.
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define void @_not_optimizable() {
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enter:
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store i32 13, ptr @tmp3, !invariant.group !0
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%barr = call ptr @llvm.launder.invariant.group(ptr @tmp3)
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store ptr %barr, ptr @ptrToTmp3
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store i32 42, ptr %barr, !invariant.group !0
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ret void
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}
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define void @usage_of_globals() {
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entry:
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%ptrVal = load ptr, ptr @ptrToTmp3
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%val = load i32, ptr %ptrVal, !invariant.group !0
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call void @changeTmp3ValAndCallBarrierInside()
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%val2 = load i32, ptr @tmp3, !invariant.group !0
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ret void;
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}
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@tmp4 = global i32 0
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define void @_GLOBAL__I_b() {
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enter:
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%val = call i32 @TheAnswerToLifeTheUniverseAndEverything()
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%p2 = call ptr @llvm.strip.invariant.group.p0(ptr @tmp4)
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store i32 %val, ptr %p2
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ret void
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}
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@tmp5 = global i32 0
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@tmp6 = global ptr null
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; CHECK: @tmp6 = local_unnamed_addr global ptr null
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define ptr @_dont_return_param(ptr %p) {
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%p2 = call ptr @llvm.launder.invariant.group(ptr %p)
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ret ptr %p2
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}
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; We should bail out if we return any pointers derived via invariant.group intrinsics at any point.
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define void @_GLOBAL__I_c() {
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enter:
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%tmp5 = call ptr @_dont_return_param(ptr @tmp5)
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store ptr %tmp5, ptr @tmp6
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ret void
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}
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declare void @changeTmp3ValAndCallBarrierInside()
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declare ptr @llvm.launder.invariant.group(ptr)
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declare ptr @llvm.strip.invariant.group.p0(ptr)
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!0 = !{}
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