forked from OSchip/llvm-project
102 lines
2.2 KiB
LLVM
102 lines
2.2 KiB
LLVM
; RUN: opt < %s -functionattrs -S | not grep {nocapture *%%q}
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; RUN: opt < %s -functionattrs -S | grep {nocapture *%%p} | count 6
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@g = global i32* null ; <i32**> [#uses=1]
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define i32* @c1(i32* %q) {
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ret i32* %q
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}
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define void @c2(i32* %q) {
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store i32* %q, i32** @g
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ret void
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}
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define void @c3(i32* %q) {
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call void @c2(i32* %q)
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ret void
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}
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define i1 @c4(i32* %q, i32 %bitno) {
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%tmp = ptrtoint i32* %q to i32
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%tmp2 = lshr i32 %tmp, %bitno
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%bit = trunc i32 %tmp2 to i1
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br i1 %bit, label %l1, label %l0
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l0:
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ret i1 0 ; escaping value not caught by def-use chaining.
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l1:
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ret i1 1 ; escaping value not caught by def-use chaining.
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}
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@lookup_table = global [2 x i1] [ i1 0, i1 1 ]
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define i1 @c5(i32* %q, i32 %bitno) {
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%tmp = ptrtoint i32* %q to i32
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%tmp2 = lshr i32 %tmp, %bitno
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%bit = and i32 %tmp2, 1
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; subtle escape mechanism follows
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%lookup = getelementptr [2 x i1]* @lookup_table, i32 0, i32 %bit
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%val = load i1* %lookup
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ret i1 %val
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}
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declare void @throw_if_bit_set(i8*, i8) readonly
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define i1 @c6(i8* %q, i8 %bit) {
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invoke void @throw_if_bit_set(i8* %q, i8 %bit)
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to label %ret0 unwind label %ret1
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ret0:
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ret i1 0
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ret1:
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ret i1 1
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}
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define i1* @lookup_bit(i32* %q, i32 %bitno) readnone nounwind {
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%tmp = ptrtoint i32* %q to i32
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%tmp2 = lshr i32 %tmp, %bitno
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%bit = and i32 %tmp2, 1
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%lookup = getelementptr [2 x i1]* @lookup_table, i32 0, i32 %bit
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ret i1* %lookup
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}
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define i1 @c7(i32* %q, i32 %bitno) {
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%ptr = call i1* @lookup_bit(i32* %q, i32 %bitno)
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%val = load i1* %ptr
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ret i1 %val
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}
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define i32 @nc1(i32* %q, i32* %p, i1 %b) {
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e:
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br label %l
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l:
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%x = phi i32* [ %p, %e ]
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%y = phi i32* [ %q, %e ]
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%tmp = bitcast i32* %x to i32* ; <i32*> [#uses=2]
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%tmp2 = select i1 %b, i32* %tmp, i32* %y
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%val = load i32* %tmp2 ; <i32> [#uses=1]
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store i32 0, i32* %tmp
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store i32* %y, i32** @g
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ret i32 %val
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}
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define void @nc2(i32* %p, i32* %q) {
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%1 = call i32 @nc1(i32* %q, i32* %p, i1 0) ; <i32> [#uses=0]
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ret void
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}
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define void @nc3(void ()* %p) {
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call void %p()
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ret void
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}
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declare void @external(i8*) readonly nounwind
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define void @nc4(i8* %p) {
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call void @external(i8* %p)
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ret void
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}
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define void @nc5(void (i8*)* %f, i8* %p) {
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call void %f(i8* %p) readonly nounwind
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call void %f(i8* nocapture %p)
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ret void
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}
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