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https://github.com/RPCS3/llvm-mirror.git
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0a30ef52f9
Summary: launder.invariant.group has the same rules of capturing as bitcast, gep, etc - the original value is not captured if the returned pointer is not captured. With this patch, we mark 40% more functions as noalias when compiling with -fstrict-vtable-pointers; 1078 vs 1778 (39.37%) Reviewers: sanjoy, davide, nlewycky, majnemer, mehdi_amini Subscribers: JDevlieghere, llvm-commits Differential Revision: https://reviews.llvm.org/D32673 llvm-svn: 331587
241 lines
6.3 KiB
LLVM
241 lines
6.3 KiB
LLVM
; RUN: opt < %s -functionattrs -S | FileCheck %s
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; RUN: opt < %s -passes=function-attrs -S | FileCheck %s
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@g = global i32* null ; <i32**> [#uses=1]
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; CHECK: define i32* @c1(i32* readnone returned %q)
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define i32* @c1(i32* %q) {
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ret i32* %q
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}
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; CHECK: define void @c2(i32* %q)
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; It would also be acceptable to mark %q as readnone. Update @c3 too.
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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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; CHECK: define void @c3(i32* %q)
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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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; CHECK: define i1 @c4(i32* %q, i32 %bitno)
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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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; CHECK: define i1 @c5(i32* %q, i32 %bitno)
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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], [2 x i1]* @lookup_table, i32 0, i32 %bit
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%val = load i1, 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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; CHECK: define i1 @c6(i8* readonly %q, i8 %bit)
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define i1 @c6(i8* %q, i8 %bit) personality i32 (...)* @__gxx_personality_v0 {
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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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%exn = landingpad {i8*, i32}
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cleanup
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ret i1 1
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}
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declare i32 @__gxx_personality_v0(...)
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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], [2 x i1]* @lookup_table, i32 0, i32 %bit
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ret i1* %lookup
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}
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; CHECK: define i1 @c7(i32* readonly %q, i32 %bitno)
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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, i1* %ptr
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ret i1 %val
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}
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; CHECK: define i32 @nc1(i32* %q, i32* nocapture %p, i1 %b)
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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, 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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; CHECK: define i32 @nc1_addrspace(i32* %q, i32 addrspace(1)* nocapture %p, i1 %b)
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define i32 @nc1_addrspace(i32* %q, i32 addrspace(1)* %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 addrspace(1)* [ %p, %e ]
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%y = phi i32* [ %q, %e ]
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%tmp = addrspacecast i32 addrspace(1)* %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, 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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; CHECK: define void @nc2(i32* nocapture %p, i32* %q)
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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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; CHECK: define void @nc3(void ()* nocapture %p)
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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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; CHECK: define void @nc4(i8* nocapture readonly %p)
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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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; CHECK: define void @nc5(void (i8*)* nocapture %f, i8* nocapture %p)
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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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; CHECK: define void @test1_1(i8* nocapture readnone %x1_1, i8* %y1_1)
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; It would be acceptable to add readnone to %y1_1 and %y1_2.
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define void @test1_1(i8* %x1_1, i8* %y1_1) {
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call i8* @test1_2(i8* %x1_1, i8* %y1_1)
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store i32* null, i32** @g
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ret void
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}
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; CHECK: define i8* @test1_2(i8* nocapture readnone %x1_2, i8* returned %y1_2)
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define i8* @test1_2(i8* %x1_2, i8* %y1_2) {
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call void @test1_1(i8* %x1_2, i8* %y1_2)
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store i32* null, i32** @g
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ret i8* %y1_2
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}
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; CHECK: define void @test2(i8* nocapture readnone %x2)
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define void @test2(i8* %x2) {
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call void @test2(i8* %x2)
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store i32* null, i32** @g
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ret void
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}
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; CHECK: define void @test3(i8* nocapture readnone %x3, i8* nocapture readnone %y3, i8* nocapture readnone %z3)
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define void @test3(i8* %x3, i8* %y3, i8* %z3) {
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call void @test3(i8* %z3, i8* %y3, i8* %x3)
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store i32* null, i32** @g
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ret void
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}
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; CHECK: define void @test4_1(i8* %x4_1)
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define void @test4_1(i8* %x4_1) {
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call i8* @test4_2(i8* %x4_1, i8* %x4_1, i8* %x4_1)
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store i32* null, i32** @g
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ret void
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}
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; CHECK: define i8* @test4_2(i8* nocapture readnone %x4_2, i8* readnone returned %y4_2, i8* nocapture readnone %z4_2)
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define i8* @test4_2(i8* %x4_2, i8* %y4_2, i8* %z4_2) {
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call void @test4_1(i8* null)
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store i32* null, i32** @g
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ret i8* %y4_2
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}
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declare i8* @test5_1(i8* %x5_1)
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; CHECK: define void @test5_2(i8* %x5_2)
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define void @test5_2(i8* %x5_2) {
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call i8* @test5_1(i8* %x5_2)
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store i32* null, i32** @g
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ret void
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}
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declare void @test6_1(i8* %x6_1, i8* nocapture %y6_1, ...)
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; CHECK: define void @test6_2(i8* %x6_2, i8* nocapture %y6_2, i8* %z6_2)
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define void @test6_2(i8* %x6_2, i8* %y6_2, i8* %z6_2) {
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call void (i8*, i8*, ...) @test6_1(i8* %x6_2, i8* %y6_2, i8* %z6_2)
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store i32* null, i32** @g
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ret void
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}
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; CHECK: define void @test_cmpxchg(i32* nocapture %p)
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define void @test_cmpxchg(i32* %p) {
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cmpxchg i32* %p, i32 0, i32 1 acquire monotonic
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ret void
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}
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; CHECK: define void @test_cmpxchg_ptr(i32** nocapture %p, i32* %q)
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define void @test_cmpxchg_ptr(i32** %p, i32* %q) {
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cmpxchg i32** %p, i32* null, i32* %q acquire monotonic
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ret void
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}
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; CHECK: define void @test_atomicrmw(i32* nocapture %p)
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define void @test_atomicrmw(i32* %p) {
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atomicrmw add i32* %p, i32 1 seq_cst
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ret void
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}
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; CHECK: define void @test_volatile(i32* %x)
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define void @test_volatile(i32* %x) {
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entry:
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%gep = getelementptr i32, i32* %x, i64 1
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store volatile i32 0, i32* %gep, align 4
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ret void
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}
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; CHECK: nocaptureLaunder(i8* nocapture %p)
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define void @nocaptureLaunder(i8* %p) {
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entry:
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%b = call i8* @llvm.launder.invariant.group.p0i8(i8* %p)
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store i8 42, i8* %b
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ret void
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}
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@g2 = global i8* null
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; CHECK: define void @captureLaunder(i8* %p)
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define void @captureLaunder(i8* %p) {
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%b = call i8* @llvm.launder.invariant.group.p0i8(i8* %p)
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store i8* %b, i8** @g2
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ret void
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}
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declare i8* @llvm.launder.invariant.group.p0i8(i8*)
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