8ebb3eac02
The legacy PM is deprecated, so update a bunch of lit tests running opt to use the new PM syntax when specifying the pipeline. In this patch focus has been put on test cases for ConstantMerge, ConstraintElimination, CorrelatedValuePropagation, GlobalDCE, GlobalOpt, SCCP, TailCallElim and PredicateInfo. Differential Revision: https://reviews.llvm.org/D114516
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 i8* @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 i8* @side_effects(i8 0)
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; CHECK-NEXT: ret i8* [[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 i8* null
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; CHECK: c2_false:
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; CHECK-NEXT: [[CA2:%.*]] = musttail call i8* @dont_zap_me(i8 [[V]])
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; CHECK-NEXT: ret i8* [[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 i8* @side_effects(i8 %v)
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ret i8* %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 i8* @no_side_effects(i8 %v)
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ret i8* %ca1
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c2_false:
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%ca2 = musttail call i8* @dont_zap_me(i8 %v)
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ret i8* %ca2
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}
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define internal i8* @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 i8* @start(i8 0)
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; CHECK-NEXT: ret i8* [[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 i8* @start(i8 %v)
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; Thus the result must be returned anyway
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ret i8* %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 i8* @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 i8* undef
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;
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ret i8* 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 i8* @dont_zap_me(i8 %v) {
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; CHECK-LABEL: define {{[^@]+}}@dont_zap_me
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; CHECK-SAME: (i8 [[V:%.*]]) {
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; CHECK-NEXT: [[I1:%.*]] = call i32 @external()
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; CHECK-NEXT: ret i8* null
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;
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%i1 = call i32 @external()
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ret i8* null
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}
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