derek.holloway
7502bf64a4
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81 lines
2.5 KiB
LLVM
81 lines
2.5 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --function-signature
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; RUN: opt < %s -passes=ipsccp -S | FileCheck %s
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; PR36485
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; musttail call result can\'t be replaced with a constant, unless the call
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; can be removed
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declare i32 @external()
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define ptr @start(i8 %v) {
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; CHECK-LABEL: define {{[^@]+}}@start
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; CHECK-SAME: (i8 [[V:%.*]]) {
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; CHECK-NEXT: [[C1:%.*]] = icmp eq i8 [[V]], 0
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; CHECK-NEXT: br i1 [[C1]], label [[TRUE:%.*]], label [[FALSE:%.*]]
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; CHECK: true:
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; CHECK-NEXT: [[CA:%.*]] = musttail call ptr @side_effects(i8 0)
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; CHECK-NEXT: ret ptr [[CA]]
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; CHECK: false:
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; CHECK-NEXT: [[C2:%.*]] = icmp eq i8 [[V]], 1
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; CHECK-NEXT: br i1 [[C2]], label [[C2_TRUE:%.*]], label [[C2_FALSE:%.*]]
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; CHECK: c2_true:
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; CHECK-NEXT: ret ptr null
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; CHECK: c2_false:
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; CHECK-NEXT: [[CA2:%.*]] = musttail call ptr @dont_zap_me(i8 [[V]])
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; CHECK-NEXT: ret ptr [[CA2]]
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;
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%c1 = icmp eq i8 %v, 0
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br i1 %c1, label %true, label %false
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true:
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%ca = musttail call ptr @side_effects(i8 %v)
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ret ptr %ca
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false:
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%c2 = icmp eq i8 %v, 1
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br i1 %c2, label %c2_true, label %c2_false
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c2_true:
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%ca1 = musttail call ptr @no_side_effects(i8 %v)
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ret ptr %ca1
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c2_false:
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%ca2 = musttail call ptr @dont_zap_me(i8 %v)
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ret ptr %ca2
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}
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define internal ptr @side_effects(i8 %v) {
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; CHECK-LABEL: define {{[^@]+}}@side_effects
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; CHECK-SAME: (i8 [[V:%.*]]) {
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; CHECK-NEXT: [[I1:%.*]] = call i32 @external()
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; CHECK-NEXT: [[CA:%.*]] = musttail call ptr @start(i8 0)
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; CHECK-NEXT: ret ptr [[CA]]
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;
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%i1 = call i32 @external()
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; since this goes back to `start` the SCPP should be see that the return value
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; is always `null`.
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; The call can't be removed due to `external` call above, though.
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%ca = musttail call ptr @start(i8 %v)
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; Thus the result must be returned anyway
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ret ptr %ca
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}
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; The call to this function is removed, so the return value must be zapped
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define internal ptr @no_side_effects(i8 %v) readonly nounwind willreturn {
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; CHECK-LABEL: define {{[^@]+}}@no_side_effects
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; CHECK-SAME: (i8 [[V:%.*]]) #[[ATTR0:[0-9]+]] {
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; CHECK-NEXT: ret ptr poison
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;
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ret ptr null
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}
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; The call to this function cannot be removed due to side effects. Thus the
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; return value should stay as it is, and should not be zapped.
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define internal ptr @dont_zap_me(i8 %v) {
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; CHECK-LABEL: define {{[^@]+}}@dont_zap_me
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; CHECK-SAME: (i8 range(i8 2, 0) [[V:%.*]]) {
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; CHECK-NEXT: [[I1:%.*]] = call i32 @external()
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; CHECK-NEXT: ret ptr null
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;
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%i1 = call i32 @external()
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ret ptr null
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}
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