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llvm-project/llvm/test/Transforms/FunctionAttrs/align.ll
Johannes Doerfert 680f638027 [Attributor][NFCI] Distinguish optional and required dependences 
Dependences between two abstract attributes SRC and TRG come naturally in
two flavors:
  Either (1) "some" information of SRC is *required* for TRG to derive
  information, or (2) SRC is just an *optional* way for TRG to derive
  information.

While it is not strictly necessary to distinguish these types
explicitly, it can help us to converge faster, in terms of iterations,
and also cut down the number of `AbstractAttribute::update` calls.

As far as I can tell, we only use optional dependences for liveness so
far but that might change in the future. With this change the Attributor
can be informed about the "dependence class" and it will perform
appropriate actions when an Attribute is set to an invalid state, thus
one that cannot be used by others to derive information from.
2019-11-02 15:26:22 -05:00

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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -attributor -attributor-manifest-internal -attributor-disable=false -attributor-max-iterations-verify -attributor-annotate-decl-cs -attributor-max-iterations=5 -S < %s | FileCheck %s --check-prefix=ATTRIBUTOR
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
; Test cases specifically designed for "align" attribute.
; We use FIXME's to indicate problems and missing attributes.
; TEST 1
; ATTRIBUTOR: define align 8 i32* @test1(i32* nofree readnone returned align 8 "no-capture-maybe-returned" %0)
define i32* @test1(i32* align 8 %0) #0 {
ret i32* %0
}
; TEST 2
; ATTRIBUTOR: define i32* @test2(i32* nofree readnone returned "no-capture-maybe-returned" %0)
define i32* @test2(i32* %0) #0 {
ret i32* %0
}
; TEST 3
; ATTRIBUTOR: define align 4 i32* @test3(i32* nofree readnone align 8 "no-capture-maybe-returned" %0, i32* nofree readnone align 4 "no-capture-maybe-returned" %1, i1 %2)
define i32* @test3(i32* align 8 %0, i32* align 4 %1, i1 %2) #0 {
%ret = select i1 %2, i32* %0, i32* %1
ret i32* %ret
}
; TEST 4
; ATTRIBUTOR: define align 32 i32* @test4(i32* nofree readnone align 32 "no-capture-maybe-returned" %0, i32* nofree readnone align 32 "no-capture-maybe-returned" %1, i1 %2)
define i32* @test4(i32* align 32 %0, i32* align 32 %1, i1 %2) #0 {
%ret = select i1 %2, i32* %0, i32* %1
ret i32* %ret
}
; TEST 5
declare i32* @unknown()
declare align 8 i32* @align8()
; ATTRIBUTOR: define align 8 i32* @test5_1()
define i32* @test5_1() {
%ret = tail call align 8 i32* @unknown()
ret i32* %ret
}
; ATTRIBUTOR: define align 8 i32* @test5_2()
define i32* @test5_2() {
%ret = tail call i32* @align8()
ret i32* %ret
}
; TEST 6
; SCC
; ATTRIBUTOR: define noalias nonnull align 536870912 dereferenceable(4294967295) i32* @test6_1()
define i32* @test6_1() #0 {
%ret = tail call i32* @test6_2()
ret i32* %ret
}
; ATTRIBUTOR: define noalias nonnull align 536870912 dereferenceable(4294967295) i32* @test6_2()
define i32* @test6_2() #0 {
%ret = tail call i32* @test6_1()
ret i32* %ret
}
; char a1 __attribute__((aligned(8)));
; char a2 __attribute__((aligned(16)));
;
; char* f1(char* a ){
; return a?a:f2(&a1);
; }
; char* f2(char* a){
; return a?f1(a):f3(&a2);
; }
;
; char* f3(char* a){
; return a?&a1: f1(&a2);
; }
@a1 = common global i8 0, align 8
@a2 = common global i8 0, align 16
; Function Attrs: nounwind readnone ssp uwtable
define internal i8* @f1(i8* readnone %0) local_unnamed_addr #0 {
%2 = icmp eq i8* %0, null
br i1 %2, label %3, label %5
; <label>:3: ; preds = %1
%4 = tail call i8* @f2(i8* nonnull @a1)
%l = load i8, i8* %4
br label %5
; <label>:5: ; preds = %1, %3
%6 = phi i8* [ %4, %3 ], [ %0, %1 ]
ret i8* %6
}
; Function Attrs: nounwind readnone ssp uwtable
define internal i8* @f2(i8* readnone %0) local_unnamed_addr #0 {
%2 = icmp eq i8* %0, null
br i1 %2, label %5, label %3
; <label>:3: ; preds = %1
%4 = tail call i8* @f1(i8* nonnull %0)
br label %7
; <label>:5: ; preds = %1
%6 = tail call i8* @f3(i8* nonnull @a2)
br label %7
; <label>:7: ; preds = %5, %3
%8 = phi i8* [ %4, %3 ], [ %6, %5 ]
ret i8* %8
}
; Function Attrs: nounwind readnone ssp uwtable
define internal i8* @f3(i8* readnone %0) local_unnamed_addr #0 {
%2 = icmp eq i8* %0, null
br i1 %2, label %3, label %5
; <label>:3: ; preds = %1
%4 = tail call i8* @f1(i8* nonnull @a2)
br label %5
; <label>:5: ; preds = %1, %3
%6 = phi i8* [ %4, %3 ], [ @a1, %1 ]
ret i8* %6
}
; TEST 7
; Better than IR information
define align 4 i32* @test7(i32* align 32 %p) #0 {
; ATTRIBUTOR-LABEL: define {{[^@]+}}@test7
; ATTRIBUTOR-SAME: (i32* nofree readnone returned align 32 "no-capture-maybe-returned" [[P:%.*]])
; ATTRIBUTOR-NEXT: ret i32* [[P:%.*]]
;
tail call i8* @f1(i8* align 8 dereferenceable(1) @a1)
ret i32* %p
}
; TEST 7b
; Function Attrs: nounwind readnone ssp uwtable
define internal i8* @f1b(i8* readnone %0) local_unnamed_addr #0 {
;
; ATTRIBUTOR-LABEL: define {{[^@]+}}@f1b
; ATTRIBUTOR-SAME: (i8* nofree nonnull readnone align 8 dereferenceable(1) "no-capture-maybe-returned" [[TMP0:%.*]]) local_unnamed_addr
; ATTRIBUTOR-NEXT: [[TMP2:%.*]] = icmp eq i8* [[TMP0:%.*]], null
; ATTRIBUTOR-NEXT: br i1 [[TMP2]], label [[TMP3:%.*]], label [[TMP5:%.*]]
; ATTRIBUTOR: 3:
; ATTRIBUTOR-NEXT: [[TMP4:%.*]] = tail call align 8 i8* @f2b(i8* nofree nonnull align 8 dereferenceable(1) @a1)
; ATTRIBUTOR-NEXT: [[L:%.*]] = load i8, i8* [[TMP4]], align 8
; ATTRIBUTOR-NEXT: store i8 [[L]], i8* @a1, align 8
; ATTRIBUTOR-NEXT: br label [[TMP5]]
; ATTRIBUTOR: 5:
; ATTRIBUTOR-NEXT: [[TMP6:%.*]] = phi i8* [ [[TMP4]], [[TMP3]] ], [ [[TMP0]], [[TMP1:%.*]] ]
; ATTRIBUTOR-NEXT: ret i8* [[TMP6]]
;
%2 = icmp eq i8* %0, null
br i1 %2, label %3, label %5
; <label>:3: ; preds = %1
%4 = tail call i8* @f2b(i8* nonnull @a1)
%l = load i8, i8* %4
store i8 %l, i8* @a1
br label %5
; <label>:5: ; preds = %1, %3
%6 = phi i8* [ %4, %3 ], [ %0, %1 ]
ret i8* %6
}
; Function Attrs: nounwind readnone ssp uwtable
define internal i8* @f2b(i8* readnone %0) local_unnamed_addr #0 {
;
; ATTRIBUTOR-LABEL: define {{[^@]+}}@f2b
; ATTRIBUTOR-SAME: (i8* nofree nonnull readnone align 8 dereferenceable(1) "no-capture-maybe-returned" [[TMP0:%.*]]) local_unnamed_addr
; ATTRIBUTOR-NEXT: [[TMP2:%.*]] = icmp eq i8* @a1, null
; ATTRIBUTOR-NEXT: br i1 [[TMP2]], label [[TMP5:%.*]], label [[TMP3:%.*]]
; ATTRIBUTOR: 3:
; ATTRIBUTOR-NEXT: [[TMP4:%.*]] = tail call i8* @f1b(i8* nofree nonnull align 8 dereferenceable(1) "no-capture-maybe-returned" @a1)
; ATTRIBUTOR-NEXT: br label [[TMP7:%.*]]
; ATTRIBUTOR: 5:
; ATTRIBUTOR-NEXT: [[TMP6:%.*]] = tail call i8* @f3b(i8* nofree nonnull align 16 dereferenceable(1) @a2)
; ATTRIBUTOR-NEXT: br label [[TMP7]]
; ATTRIBUTOR: 7:
; ATTRIBUTOR-NEXT: [[TMP8:%.*]] = phi i8* [ [[TMP4]], [[TMP3]] ], [ [[TMP6]], [[TMP5]] ]
; ATTRIBUTOR-NEXT: ret i8* [[TMP8]]
;
%2 = icmp eq i8* %0, null
br i1 %2, label %5, label %3
; <label>:3: ; preds = %1
%4 = tail call i8* @f1b(i8* nonnull %0)
br label %7
; <label>:5: ; preds = %1
%6 = tail call i8* @f3b(i8* nonnull @a2)
br label %7
; <label>:7: ; preds = %5, %3
%8 = phi i8* [ %4, %3 ], [ %6, %5 ]
ret i8* %8
}
; Function Attrs: nounwind readnone ssp uwtable
define internal i8* @f3b(i8* readnone %0) local_unnamed_addr #0 {
;
; ATTRIBUTOR-LABEL: define {{[^@]+}}@f3b
; ATTRIBUTOR-SAME: (i8* nocapture nofree nonnull readnone align 16 dereferenceable(1) [[TMP0:%.*]]) local_unnamed_addr
; ATTRIBUTOR-NEXT: [[TMP2:%.*]] = icmp eq i8* @a2, null
; ATTRIBUTOR-NEXT: br i1 [[TMP2]], label [[TMP3:%.*]], label [[TMP5:%.*]]
; ATTRIBUTOR: 3:
; ATTRIBUTOR-NEXT: [[TMP4:%.*]] = tail call i8* @f1b(i8* nofree nonnull align 16 dereferenceable(1) @a2)
; ATTRIBUTOR-NEXT: br label [[TMP5]]
; ATTRIBUTOR: 5:
; ATTRIBUTOR-NEXT: [[TMP6:%.*]] = phi i8* [ [[TMP4]], [[TMP3]] ], [ @a1, [[TMP1:%.*]] ]
; ATTRIBUTOR-NEXT: ret i8* [[TMP6]]
;
%2 = icmp eq i8* %0, null
br i1 %2, label %3, label %5
; <label>:3: ; preds = %1
%4 = tail call i8* @f1b(i8* nonnull @a2)
br label %5
; <label>:5: ; preds = %1, %3
%6 = phi i8* [ %4, %3 ], [ @a1, %1 ]
ret i8* %6
}
define align 4 i32* @test7b(i32* align 32 %p) #0 {
; ATTRIBUTOR-LABEL: define {{[^@]+}}@test7b
; ATTRIBUTOR-SAME: (i32* nofree readnone returned align 32 "no-capture-maybe-returned" [[P:%.*]])
; ATTRIBUTOR-NEXT: [[TMP1:%.*]] = tail call i8* @f1b(i8* nofree nonnull align 8 dereferenceable(1) @a1)
; ATTRIBUTOR-NEXT: ret i32* [[P:%.*]]
;
tail call i8* @f1b(i8* align 8 dereferenceable(1) @a1)
ret i32* %p
}
; TEST 8
define void @test8_helper() {
%ptr0 = tail call i32* @unknown()
%ptr1 = tail call align 4 i32* @unknown()
%ptr2 = tail call align 8 i32* @unknown()
tail call void @test8(i32* %ptr1, i32* %ptr1, i32* %ptr0)
; ATTRIBUTOR: tail call void @test8(i32* align 4 %ptr1, i32* align 4 %ptr1, i32* %ptr0)
tail call void @test8(i32* %ptr2, i32* %ptr1, i32* %ptr1)
; ATTRIBUTOR: tail call void @test8(i32* align 8 %ptr2, i32* align 4 %ptr1, i32* align 4 %ptr1)
tail call void @test8(i32* %ptr2, i32* %ptr1, i32* %ptr1)
; ATTRIBUTOR: tail call void @test8(i32* align 8 %ptr2, i32* align 4 %ptr1, i32* align 4 %ptr1)
ret void
}
declare void @user_i32_ptr(i32*) readnone nounwind
define internal void @test8(i32* %a, i32* %b, i32* %c) {
; ATTRIBUTOR: define internal void @test8(i32* nocapture readnone align 4 %a, i32* nocapture readnone align 4 %b, i32* nocapture readnone %c)
call void @user_i32_ptr(i32* %a)
call void @user_i32_ptr(i32* %b)
call void @user_i32_ptr(i32* %c)
ret void
}
declare void @test9_helper(i32* %A)
define void @test9_traversal(i1 %c, i32* align 4 %B, i32* align 8 %C) {
%sel = select i1 %c, i32* %B, i32* %C
call void @test9_helper(i32* %sel)
ret void
}
; FIXME: This will work with an upcoming patch (D66618 or similar)
; define align 32 i32* @test10a(i32* align 32 "no-capture-maybe-returned" %p)
; ATTRIBUTOR: define i32* @test10a(i32* nofree nonnull align 32 dereferenceable(4) "no-capture-maybe-returned" %p)
define i32* @test10a(i32* align 32 %p) {
; ATTRIBUTOR: %l = load i32, i32* %p, align 32
%l = load i32, i32* %p
%c = icmp eq i32 %l, 0
br i1 %c, label %t, label %f
t:
%r = call i32* @test10a(i32* %p)
; FIXME: This will work with an upcoming patch (D66618 or similar)
; store i32 1, i32* %r, align 32
; ATTRIBUTOR: store i32 1, i32* %r
store i32 1, i32* %r
%g0 = getelementptr i32, i32* %p, i32 8
br label %e
f:
%g1 = getelementptr i32, i32* %p, i32 8
; FIXME: This will work with an upcoming patch (D66618 or similar)
; store i32 -1, i32* %g1, align 32
; ATTRIBUTOR: store i32 -1, i32* %g1
store i32 -1, i32* %g1
br label %e
e:
%phi = phi i32* [%g0, %t], [%g1, %f]
ret i32* %phi
}
; FIXME: This will work with an upcoming patch (D66618 or similar)
; define align 32 i32* @test10b(i32* align 32 "no-capture-maybe-returned" %p)
; ATTRIBUTOR: define i32* @test10b(i32* nofree nonnull align 32 dereferenceable(4) "no-capture-maybe-returned" %p)
define i32* @test10b(i32* align 32 %p) {
; ATTRIBUTOR: %l = load i32, i32* %p, align 32
%l = load i32, i32* %p
%c = icmp eq i32 %l, 0
br i1 %c, label %t, label %f
t:
%r = call i32* @test10b(i32* %p)
; FIXME: This will work with an upcoming patch (D66618 or similar)
; store i32 1, i32* %r, align 32
; ATTRIBUTOR: store i32 1, i32* %r
store i32 1, i32* %r
%g0 = getelementptr i32, i32* %p, i32 8
br label %e
f:
%g1 = getelementptr i32, i32* %p, i32 -8
; FIXME: This will work with an upcoming patch (D66618 or similar)
; store i32 -1, i32* %g1, align 32
; ATTRIBUTOR: store i32 -1, i32* %g1
store i32 -1, i32* %g1
br label %e
e:
%phi = phi i32* [%g0, %t], [%g1, %f]
ret i32* %phi
}
attributes #0 = { nounwind uwtable noinline }
attributes #1 = { uwtable noinline }
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