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74c7fb002f
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
30 lines
827 B
C
30 lines
827 B
C
// RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm %s -o - | FileCheck %s
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int absi(int x) {
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// CHECK-LABEL: @absi(
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// CHECK: [[NEG:%.*]] = sub nsw i32 0, [[X:%.*]]
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// CHECK: [[CMP:%.*]] = icmp slt i32 [[X]], 0
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// CHECK: [[SEL:%.*]] = select i1 [[CMP]], i32 [[NEG]], i32 [[X]]
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//
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return __builtin_abs(x);
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}
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long absl(long x) {
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// CHECK-LABEL: @absl(
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// CHECK: [[NEG:%.*]] = sub nsw i64 0, [[X:%.*]]
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// CHECK: [[CMP:%.*]] = icmp slt i64 [[X]], 0
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// CHECK: [[SEL:%.*]] = select i1 [[CMP]], i64 [[NEG]], i64 [[X]]
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//
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return __builtin_labs(x);
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}
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long long absll(long long x) {
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// CHECK-LABEL: @absll(
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// CHECK: [[NEG:%.*]] = sub nsw i64 0, [[X:%.*]]
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// CHECK: [[CMP:%.*]] = icmp slt i64 [[X]], 0
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// CHECK: [[SEL:%.*]] = select i1 [[CMP]], i64 [[NEG]], i64 [[X]]
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//
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return __builtin_llabs(x);
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}
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