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llvm-project/clang/test/CodeGen/sanitize-atomic-int-overflow.c

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[CodeGen] Fix some broken IR generated by -fsanitize=unsigned-integer-overflow I think the author of the function assumed that `GetInsertBlock()` wouldn't change from where `atomicPHI` was created, but this isn't true when `-fsanitize=unsigned-integer-overflow` is enabled (we generate an overflow/continuation label). Fix by keeping track of the block we want to return to to complete the cmpxchg loop. rdar://48406558 Differential revision: https://reviews.llvm.org/D58744 llvm-svn: 355054
2019-02-28 08:47:55 +08:00
// RUN: %clang_cc1 -triple x86_64-apple-macosx10.14.0 -fsanitize=unsigned-integer-overflow %s -emit-llvm -o - | FileCheck %s
_Atomic(unsigned) atomic;
// CHECK-LABEL: define void @cmpd_assign
void cmpd_assign() {
// CHECK: br label %[[LOOP_START:.*]]
// CHECK: [[LOOP_START]]:
// CHECK-NEXT: phi i32 {{.*}}, [ {{.*}}, %[[INCOMING_BLOCK:.*]] ]
// CHECK: [[INCOMING_BLOCK]]:
// CHECK-NEXT: cmpxchg
// CHECK-NEXT: extractvalue
// CHECK-NEXT: extractvalue
// CHECK-NEXT: br i1 %8, label %{{.*}}, label %[[LOOP_START]]
atomic += 1;
}
// CHECK-LABEL: define void @inc
void inc() {
// CHECK: br label %[[LOOP_START:.*]]
// CHECK: [[LOOP_START]]:
// CHECK-NEXT: phi i32 {{.*}}, [ {{.*}}, %[[INCOMING_BLOCK:.*]] ]
// CHECK: [[INCOMING_BLOCK]]:
// CHECK-NEXT: cmpxchg
// CHECK-NEXT: extractvalue
// CHECK-NEXT: extractvalue
// CHECK-NEXT: br i1 %8, label %{{.*}}, label %[[LOOP_START]]
atomic++;
}