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llvm-mirror/test/Transforms/FunctionAttrs/nocapture.ll
Nikita Popov cf8ee33937 [IR] Convert null-pointer-is-valid into an enum attribute 
The "null-pointer-is-valid" attribute needs to be checked by many
pointer-related combines. To make the check more efficient, convert
it from a string into an enum attribute.

In the future, this attribute may be replaced with data layout
properties.

Differential Revision: https://reviews.llvm.org/D78862
2020-05-15 19:41:07 +02:00

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; RUN: opt -functionattrs -S < %s | FileCheck %s --check-prefixes=FNATTR
; RUN: opt -passes=function-attrs -S < %s | FileCheck %s --check-prefixes=FNATTR
@g = global i32* null ; <i32**> [#uses=1]
; FNATTR: define i32* @c1(i32* readnone returned %q)
define i32* @c1(i32* %q) {
ret i32* %q
}
; FNATTR: define void @c2(i32* %q)
; It would also be acceptable to mark %q as readnone. Update @c3 too.
define void @c2(i32* %q) {
store i32* %q, i32** @g
ret void
}
; FNATTR: define void @c3(i32* %q)
define void @c3(i32* %q) {
call void @c2(i32* %q)
ret void
}
; FNATTR: define i1 @c4(i32* %q, i32 %bitno)
define i1 @c4(i32* %q, i32 %bitno) {
%tmp = ptrtoint i32* %q to i32
%tmp2 = lshr i32 %tmp, %bitno
%bit = trunc i32 %tmp2 to i1
br i1 %bit, label %l1, label %l0
l0:
ret i1 0 ; escaping value not caught by def-use chaining.
l1:
ret i1 1 ; escaping value not caught by def-use chaining.
}
; c4b is c4 but without the escaping part
; FNATTR: define i1 @c4b(i32* %q, i32 %bitno)
define i1 @c4b(i32* %q, i32 %bitno) {
%tmp = ptrtoint i32* %q to i32
%tmp2 = lshr i32 %tmp, %bitno
%bit = trunc i32 %tmp2 to i1
br i1 %bit, label %l1, label %l0
l0:
ret i1 0 ; not escaping!
l1:
ret i1 0 ; not escaping!
}
@lookup_table = global [2 x i1] [ i1 0, i1 1 ]
; FNATTR: define i1 @c5(i32* %q, i32 %bitno)
define i1 @c5(i32* %q, i32 %bitno) {
%tmp = ptrtoint i32* %q to i32
%tmp2 = lshr i32 %tmp, %bitno
%bit = and i32 %tmp2, 1
; subtle escape mechanism follows
%lookup = getelementptr [2 x i1], [2 x i1]* @lookup_table, i32 0, i32 %bit
%val = load i1, i1* %lookup
ret i1 %val
}
declare void @throw_if_bit_set(i8*, i8) readonly
; FNATTR: define i1 @c6(i8* readonly %q, i8 %bit)
define i1 @c6(i8* %q, i8 %bit) personality i32 (...)* @__gxx_personality_v0 {
invoke void @throw_if_bit_set(i8* %q, i8 %bit)
to label %ret0 unwind label %ret1
ret0:
ret i1 0
ret1:
%exn = landingpad {i8*, i32}
cleanup
ret i1 1
}
declare i32 @__gxx_personality_v0(...)
define i1* @lookup_bit(i32* %q, i32 %bitno) readnone nounwind {
%tmp = ptrtoint i32* %q to i32
%tmp2 = lshr i32 %tmp, %bitno
%bit = and i32 %tmp2, 1
%lookup = getelementptr [2 x i1], [2 x i1]* @lookup_table, i32 0, i32 %bit
ret i1* %lookup
}
; FNATTR: define i1 @c7(i32* readonly %q, i32 %bitno)
define i1 @c7(i32* %q, i32 %bitno) {
%ptr = call i1* @lookup_bit(i32* %q, i32 %bitno)
%val = load i1, i1* %ptr
ret i1 %val
}
; FNATTR: define i32 @nc1(i32* %q, i32* nocapture %p, i1 %b)
define i32 @nc1(i32* %q, i32* %p, i1 %b) {
e:
br label %l
l:
%x = phi i32* [ %p, %e ]
%y = phi i32* [ %q, %e ]
%tmp = bitcast i32* %x to i32* ; <i32*> [#uses=2]
%tmp2 = select i1 %b, i32* %tmp, i32* %y
%val = load i32, i32* %tmp2 ; <i32> [#uses=1]
store i32 0, i32* %tmp
store i32* %y, i32** @g
ret i32 %val
}
; FNATTR: define i32 @nc1_addrspace(i32* %q, i32 addrspace(1)* nocapture %p, i1 %b)
define i32 @nc1_addrspace(i32* %q, i32 addrspace(1)* %p, i1 %b) {
e:
br label %l
l:
%x = phi i32 addrspace(1)* [ %p, %e ]
%y = phi i32* [ %q, %e ]
%tmp = addrspacecast i32 addrspace(1)* %x to i32* ; <i32*> [#uses=2]
%tmp2 = select i1 %b, i32* %tmp, i32* %y
%val = load i32, i32* %tmp2 ; <i32> [#uses=1]
store i32 0, i32* %tmp
store i32* %y, i32** @g
ret i32 %val
}
; FNATTR: define void @nc2(i32* nocapture %p, i32* %q)
define void @nc2(i32* %p, i32* %q) {
%1 = call i32 @nc1(i32* %q, i32* %p, i1 0) ; <i32> [#uses=0]
ret void
}
; FNATTR: define void @nc3(void ()* nocapture %p)
define void @nc3(void ()* %p) {
call void %p()
ret void
}
declare void @external(i8*) readonly nounwind
; FNATTR: define void @nc4(i8* nocapture readonly %p)
define void @nc4(i8* %p) {
call void @external(i8* %p)
ret void
}
; FNATTR: define void @nc5(void (i8*)* nocapture %f, i8* nocapture %p)
define void @nc5(void (i8*)* %f, i8* %p) {
call void %f(i8* %p) readonly nounwind
call void %f(i8* nocapture %p)
ret void
}
; FNATTR: define void @test1_1(i8* nocapture readnone %x1_1, i8* %y1_1, i1 %c)
; It would be acceptable to add readnone to %y1_1 and %y1_2.
define void @test1_1(i8* %x1_1, i8* %y1_1, i1 %c) {
call i8* @test1_2(i8* %x1_1, i8* %y1_1, i1 %c)
store i32* null, i32** @g
ret void
}
; FNATTR: define i8* @test1_2(i8* nocapture readnone %x1_2, i8* returned %y1_2, i1 %c)
define i8* @test1_2(i8* %x1_2, i8* %y1_2, i1 %c) {
br i1 %c, label %t, label %f
t:
call void @test1_1(i8* %x1_2, i8* %y1_2, i1 %c)
store i32* null, i32** @g
br label %f
f:
ret i8* %y1_2
}
; FNATTR: define void @test2(i8* nocapture readnone %x2)
define void @test2(i8* %x2) {
call void @test2(i8* %x2)
store i32* null, i32** @g
ret void
}
; FNATTR: define void @test3(i8* nocapture readnone %x3, i8* nocapture readnone %y3, i8* nocapture readnone %z3)
define void @test3(i8* %x3, i8* %y3, i8* %z3) {
call void @test3(i8* %z3, i8* %y3, i8* %x3)
store i32* null, i32** @g
ret void
}
; FNATTR: define void @test4_1(i8* %x4_1, i1 %c)
define void @test4_1(i8* %x4_1, i1 %c) {
call i8* @test4_2(i8* %x4_1, i8* %x4_1, i8* %x4_1, i1 %c)
store i32* null, i32** @g
ret void
}
; FNATTR: define i8* @test4_2(i8* nocapture readnone %x4_2, i8* readnone returned %y4_2, i8* nocapture readnone %z4_2, i1 %c)
define i8* @test4_2(i8* %x4_2, i8* %y4_2, i8* %z4_2, i1 %c) {
br i1 %c, label %t, label %f
t:
call void @test4_1(i8* null, i1 %c)
store i32* null, i32** @g
br label %f
f:
ret i8* %y4_2
}
declare i8* @test5_1(i8* %x5_1)
; FNATTR: define void @test5_2(i8* %x5_2)
define void @test5_2(i8* %x5_2) {
call i8* @test5_1(i8* %x5_2)
store i32* null, i32** @g
ret void
}
declare void @test6_1(i8* %x6_1, i8* nocapture %y6_1, ...)
; FNATTR: define void @test6_2(i8* %x6_2, i8* nocapture %y6_2, i8* %z6_2)
define void @test6_2(i8* %x6_2, i8* %y6_2, i8* %z6_2) {
call void (i8*, i8*, ...) @test6_1(i8* %x6_2, i8* %y6_2, i8* %z6_2)
store i32* null, i32** @g
ret void
}
; FNATTR: define void @test_cmpxchg(i32* nocapture %p)
define void @test_cmpxchg(i32* %p) {
cmpxchg i32* %p, i32 0, i32 1 acquire monotonic
ret void
}
; FNATTR: define void @test_cmpxchg_ptr(i32** nocapture %p, i32* %q)
define void @test_cmpxchg_ptr(i32** %p, i32* %q) {
cmpxchg i32** %p, i32* null, i32* %q acquire monotonic
ret void
}
; FNATTR: define void @test_atomicrmw(i32* nocapture %p)
define void @test_atomicrmw(i32* %p) {
atomicrmw add i32* %p, i32 1 seq_cst
ret void
}
; FNATTR: define void @test_volatile(i32* %x)
define void @test_volatile(i32* %x) {
entry:
%gep = getelementptr i32, i32* %x, i64 1
store volatile i32 0, i32* %gep, align 4
ret void
}
; FNATTR: nocaptureLaunder(i8* nocapture %p)
define void @nocaptureLaunder(i8* %p) {
entry:
%b = call i8* @llvm.launder.invariant.group.p0i8(i8* %p)
store i8 42, i8* %b
ret void
}
@g2 = global i8* null
; FNATTR: define void @captureLaunder(i8* %p)
define void @captureLaunder(i8* %p) {
%b = call i8* @llvm.launder.invariant.group.p0i8(i8* %p)
store i8* %b, i8** @g2
ret void
}
; FNATTR: @nocaptureStrip(i8* nocapture %p)
define void @nocaptureStrip(i8* %p) {
entry:
%b = call i8* @llvm.strip.invariant.group.p0i8(i8* %p)
store i8 42, i8* %b
ret void
}
@g3 = global i8* null
; FNATTR: define void @captureStrip(i8* %p)
define void @captureStrip(i8* %p) {
%b = call i8* @llvm.strip.invariant.group.p0i8(i8* %p)
store i8* %b, i8** @g3
ret void
}
; FNATTR: define i1 @captureICmp(i32* readnone %x)
define i1 @captureICmp(i32* %x) {
%1 = icmp eq i32* %x, null
ret i1 %1
}
; FNATTR: define i1 @captureICmpRev(i32* readnone %x)
define i1 @captureICmpRev(i32* %x) {
%1 = icmp eq i32* null, %x
ret i1 %1
}
; FNATTR: define i1 @nocaptureInboundsGEPICmp(i32* nocapture readnone %x)
define i1 @nocaptureInboundsGEPICmp(i32* %x) {
%1 = getelementptr inbounds i32, i32* %x, i32 5
%2 = bitcast i32* %1 to i8*
%3 = icmp eq i8* %2, null
ret i1 %3
}
; FNATTR: define i1 @nocaptureInboundsGEPICmpRev(i32* nocapture readnone %x)
define i1 @nocaptureInboundsGEPICmpRev(i32* %x) {
%1 = getelementptr inbounds i32, i32* %x, i32 5
%2 = bitcast i32* %1 to i8*
%3 = icmp eq i8* null, %2
ret i1 %3
}
; FNATTR: define i1 @nocaptureDereferenceableOrNullICmp(i32* nocapture readnone dereferenceable_or_null(4) %x)
define i1 @nocaptureDereferenceableOrNullICmp(i32* dereferenceable_or_null(4) %x) {
%1 = bitcast i32* %x to i8*
%2 = icmp eq i8* %1, null
ret i1 %2
}
; FNATTR: define i1 @captureDereferenceableOrNullICmp(i32* readnone dereferenceable_or_null(4) %x)
define i1 @captureDereferenceableOrNullICmp(i32* dereferenceable_or_null(4) %x) null_pointer_is_valid {
%1 = bitcast i32* %x to i8*
%2 = icmp eq i8* %1, null
ret i1 %2
}
declare i8* @llvm.launder.invariant.group.p0i8(i8*)
declare i8* @llvm.strip.invariant.group.p0i8(i8*)
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