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llvm-project/clang/test/CodeGen/builtin-abs.c

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[CodeGen] add tests for abs builtins; NFC llvm-svn: 332988
2018-05-22 23:11:59 +08:00
// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm %s -o - | FileCheck %s
int absi(int x) {
// CHECK-LABEL: @absi(
[CodeGen] use nsw negation for builtin abs The clang builtins have the same semantics as the stdlib functions. The stdlib functions are defined in section 7.20.6.1 of the C standard with: "If the result cannot be represented, the behavior is undefined." That lets us mark the negation with 'nsw' because "sub i32 0, INT_MIN" would be UB/poison. Differential Revision: https://reviews.llvm.org/D47202 llvm-svn: 333038
2018-05-23 07:02:13 +08:00
// CHECK: [[NEG:%.*]] = sub nsw i32 0, [[X:%.*]]
[CodeGen] produce the LLVM canonical form of abs We chose the 'slt' form as canonical in IR with: rL332819 ...so we should generate that form directly for efficiency. llvm-svn: 332989
2018-05-22 23:36:50 +08:00
// CHECK: [[CMP:%.*]] = icmp slt i32 [[X]], 0
// CHECK: [[SEL:%.*]] = select i1 [[CMP]], i32 [[NEG]], i32 [[X]]
[CodeGen] add tests for abs builtins; NFC llvm-svn: 332988
2018-05-22 23:11:59 +08:00
//
return __builtin_abs(x);
}
long absl(long x) {
// CHECK-LABEL: @absl(
[CodeGen] use nsw negation for builtin abs The clang builtins have the same semantics as the stdlib functions. The stdlib functions are defined in section 7.20.6.1 of the C standard with: "If the result cannot be represented, the behavior is undefined." That lets us mark the negation with 'nsw' because "sub i32 0, INT_MIN" would be UB/poison. Differential Revision: https://reviews.llvm.org/D47202 llvm-svn: 333038
2018-05-23 07:02:13 +08:00
// CHECK: [[NEG:%.*]] = sub nsw i64 0, [[X:%.*]]
[CodeGen] produce the LLVM canonical form of abs We chose the 'slt' form as canonical in IR with: rL332819 ...so we should generate that form directly for efficiency. llvm-svn: 332989
2018-05-22 23:36:50 +08:00
// CHECK: [[CMP:%.*]] = icmp slt i64 [[X]], 0
// CHECK: [[SEL:%.*]] = select i1 [[CMP]], i64 [[NEG]], i64 [[X]]
[CodeGen] add tests for abs builtins; NFC llvm-svn: 332988
2018-05-22 23:11:59 +08:00
//
return __builtin_labs(x);
}
long long absll(long long x) {
// CHECK-LABEL: @absll(
[CodeGen] use nsw negation for builtin abs The clang builtins have the same semantics as the stdlib functions. The stdlib functions are defined in section 7.20.6.1 of the C standard with: "If the result cannot be represented, the behavior is undefined." That lets us mark the negation with 'nsw' because "sub i32 0, INT_MIN" would be UB/poison. Differential Revision: https://reviews.llvm.org/D47202 llvm-svn: 333038
2018-05-23 07:02:13 +08:00
// CHECK: [[NEG:%.*]] = sub nsw i64 0, [[X:%.*]]
[CodeGen] produce the LLVM canonical form of abs We chose the 'slt' form as canonical in IR with: rL332819 ...so we should generate that form directly for efficiency. llvm-svn: 332989
2018-05-22 23:36:50 +08:00
// CHECK: [[CMP:%.*]] = icmp slt i64 [[X]], 0
// CHECK: [[SEL:%.*]] = select i1 [[CMP]], i64 [[NEG]], i64 [[X]]
[CodeGen] add tests for abs builtins; NFC llvm-svn: 332988
2018-05-22 23:11:59 +08:00
//
return __builtin_llabs(x);
}