; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --function-signature --check-attributes --check-globals
; RUN: opt -aa-pipeline=basic-aa -passes=attributor -attributor-manifest-internal -attributor-annotate-decl-cs -S < %s | FileCheck %s --check-prefixes=CHECK,TUNIT
; RUN: opt -aa-pipeline=basic-aa -passes=attributor-cgscc -attributor-manifest-internal -attributor-annotate-decl-cs -S < %s | FileCheck %s --check-prefixes=CHECK,CGSCC
; PR36485
; musttail call result can't be replaced with a constant, unless the call can be removed
declare i32 @external()
define ptr @start(i8 %v) {
;
; TUNIT-LABEL: define {{[^@]+}}@start
; TUNIT-SAME: (i8 [[V:%.*]]) {
; TUNIT-NEXT: [[C1:%.*]] = icmp eq i8 [[V]], 0
; TUNIT-NEXT: br i1 [[C1]], label [[TRUE:%.*]], label [[FALSE:%.*]]
; TUNIT: true:
; TUNIT-NEXT: [[CA:%.*]] = musttail call noalias noundef align 4294967296 ptr @side_effects(i8 [[V]])
; TUNIT-NEXT: ret ptr [[CA]]
; TUNIT: false:
; TUNIT-NEXT: [[C2:%.*]] = icmp eq i8 [[V]], 1
; TUNIT-NEXT: br i1 [[C2]], label [[C2_TRUE:%.*]], label [[C2_FALSE:%.*]]
; TUNIT: c2_true:
; TUNIT-NEXT: ret ptr null
; TUNIT: c2_false:
; TUNIT-NEXT: [[CA2:%.*]] = musttail call noalias noundef align 4294967296 ptr @dont_zap_me(i8 undef)
; TUNIT-NEXT: ret ptr [[CA2]]
;
; CGSCC-LABEL: define {{[^@]+}}@start
; CGSCC-SAME: (i8 [[V:%.*]]) {
; CGSCC-NEXT: [[C1:%.*]] = icmp eq i8 [[V]], 0
; CGSCC-NEXT: br i1 [[C1]], label [[TRUE:%.*]], label [[FALSE:%.*]]
; CGSCC: true:
; CGSCC-NEXT: [[CA:%.*]] = musttail call noalias noundef align 4294967296 ptr @side_effects(i8 [[V]])
; CGSCC-NEXT: ret ptr [[CA]]
; CGSCC: false:
; CGSCC-NEXT: [[C2:%.*]] = icmp eq i8 [[V]], 1
; CGSCC-NEXT: br i1 [[C2]], label [[C2_TRUE:%.*]], label [[C2_FALSE:%.*]]
; CGSCC: c2_true:
; CGSCC-NEXT: [[CA1:%.*]] = musttail call noalias noundef align 4294967296 ptr @no_side_effects(i8 [[V]])
; CGSCC-NEXT: ret ptr [[CA1]]
; CGSCC: c2_false:
; CGSCC-NEXT: [[CA2:%.*]] = musttail call noalias noundef align 4294967296 ptr @dont_zap_me(i8 [[V]])
; CGSCC-NEXT: ret ptr [[CA2]]
;
%c1 = icmp eq i8 %v, 0
br i1 %c1, label %true, label %false
true:
; FIXME: propagate the value information for %v
%ca = musttail call ptr @side_effects(i8 %v)
ret ptr %ca
false:
%c2 = icmp eq i8 %v, 1
br i1 %c2, label %c2_true, label %c2_false
c2_true:
%ca1 = musttail call ptr @no_side_effects(i8 %v)
ret ptr %ca1
c2_false:
%ca2 = musttail call ptr @dont_zap_me(i8 %v)
ret ptr %ca2
}
define internal ptr @side_effects(i8 %v) {
; CHECK-LABEL: define {{[^@]+}}@side_effects
; CHECK-SAME: (i8 [[V:%.*]]) {
; CHECK-NEXT: [[I1:%.*]] = call i32 @external()
; CHECK-NEXT: [[CA:%.*]] = musttail call noalias noundef align 4294967296 ptr @start(i8 0)
; CHECK-NEXT: ret ptr [[CA]]
;
%i1 = call i32 @external()
; since this goes back to `start` the SCPP should be see that the return value
; is always `null`.
; The call can't be removed due to `external` call above, though.
%ca = musttail call ptr @start(i8 %v)
; Thus the result must be returned anyway
ret ptr %ca
}
define internal ptr @no_side_effects(i8 %v) readonly nounwind {
; CGSCC: Function Attrs: mustprogress nofree norecurse nosync nounwind willreturn memory(none)
; CGSCC-LABEL: define {{[^@]+}}@no_side_effects
; CGSCC-SAME: (i8 [[V:%.*]]) #[[ATTR0:[0-9]+]] {
; CGSCC-NEXT: ret ptr null
;
ret ptr null
}
define internal ptr @dont_zap_me(i8 %v) {
; CHECK-LABEL: define {{[^@]+}}@dont_zap_me
; CHECK-SAME: (i8 [[V:%.*]]) {
; CHECK-NEXT: [[I1:%.*]] = call i32 @external()
; CHECK-NEXT: ret ptr null
;
%i1 = call i32 @external()
ret ptr null
}
;.
; CGSCC: attributes #[[ATTR0]] = { mustprogress nofree norecurse nosync nounwind willreturn memory(none) }
;.
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