| 1 | // RUN: %clang_cc1 %s -emit-llvm -o - | FileCheck %s |
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| 2 | |
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| 3 | int test__builtin_clrsb(int x) { |
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| 4 | // CHECK-LABEL: test__builtin_clrsb |
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| 5 | // CHECK: [[C:%.*]] = icmp slt i32 [[X:%.*]], 0 |
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| 6 | // CHECK-NEXT: [[INV:%.*]] = xor i32 [[X]], -1 |
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| 7 | // CHECK-NEXT: [[SEL:%.*]] = select i1 [[C]], i32 [[INV]], i32 [[X]] |
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| 8 | // CHECK-NEXT: [[CTLZ:%.*]] = call i32 @llvm.ctlz.i32(i32 [[SEL]], i1 false) |
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| 9 | // CHECK-NEXT: [[SUB:%.*]] = sub i32 [[CTLZ]], 1 |
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| 10 | return __builtin_clrsb(x); |
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| 11 | } |
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| 12 | |
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| 13 | int test__builtin_clrsbll(long long x) { |
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| 14 | // CHECK-LABEL: test__builtin_clrsbll |
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| 15 | // CHECK: [[C:%.*]] = icmp slt i64 [[X:%.*]], 0 |
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| 16 | // CHECK-NEXT: [[INV:%.*]] = xor i64 [[X]], -1 |
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| 17 | // CHECK-NEXT: [[SEL:%.*]] = select i1 [[C]], i64 [[INV]], i64 [[X]] |
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| 18 | // CHECK-NEXT: [[CTLZ:%.*]] = call i64 @llvm.ctlz.i64(i64 [[SEL]], i1 false) |
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| 19 | // CHECK-NEXT: [[SUB:%.*]] = sub i64 [[CTLZ]], 1 |
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| 20 | // CHECK-NEXT: trunc i64 [[SUB]] to i32 |
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| 21 | return __builtin_clrsbll(x); |
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| 22 | } |
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| 23 | |
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