derek.holloway
7502bf64a4
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71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -w -emit-llvm -o - %s -fsanitize=builtin | FileCheck %s --check-prefixes=CHECK,POISON
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// RUN: %clang_cc1 -triple arm64-none-linux-gnu -w -emit-llvm -o - %s -fsanitize=builtin | FileCheck %s --check-prefixes=CHECK,NOPOISON
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// A zero input to __bultin_ctz/clz is considered UB even if the target does not
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// want to optimize based on zero input being undefined.
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// CHECK: define{{.*}} void @check_ctz
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void check_ctz(int n) {
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// CHECK: [[NOT_ZERO:%.*]] = icmp ne i32 [[N:%.*]], 0, !nosanitize
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// CHECK-NEXT: br i1 [[NOT_ZERO]]
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//
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// Handler block:
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// CHECK: call void @__ubsan_handle_invalid_builtin
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// CHECK-NEXT: unreachable
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//
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// Continuation block:
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// POISON: call i32 @llvm.cttz.i32(i32 [[N]], i1 true)
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// NOPOISON: call i32 @llvm.cttz.i32(i32 [[N]], i1 false)
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__builtin_ctz(n);
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// CHECK: call void @__ubsan_handle_invalid_builtin
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__builtin_ctzl(n);
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// CHECK: call void @__ubsan_handle_invalid_builtin
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__builtin_ctzll(n);
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// CHECK: call void @__ubsan_handle_invalid_builtin
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__builtin_ctzg((unsigned int)n);
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}
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// CHECK: define{{.*}} void @check_clz
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void check_clz(int n) {
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// CHECK: [[NOT_ZERO:%.*]] = icmp ne i32 [[N:%.*]], 0, !nosanitize
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// CHECK-NEXT: br i1 [[NOT_ZERO]]
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//
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// Handler block:
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// CHECK: call void @__ubsan_handle_invalid_builtin
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// CHECK-NEXT: unreachable
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//
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// Continuation block:
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// POISON: call i32 @llvm.ctlz.i32(i32 [[N]], i1 true)
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// NOPOISON: call i32 @llvm.ctlz.i32(i32 [[N]], i1 false)
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__builtin_clz(n);
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// CHECK: call void @__ubsan_handle_invalid_builtin
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__builtin_clzl(n);
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// CHECK: call void @__ubsan_handle_invalid_builtin
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__builtin_clzll(n);
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// CHECK: call void @__ubsan_handle_invalid_builtin
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__builtin_clzg((unsigned int)n);
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}
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// CHECK: define{{.*}} void @check_assume
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void check_assume(int n) {
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// CHECK: [[TOBOOL:%.*]] = icmp ne i32 [[N:%.*]], 0
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// CHECK-NEXT: br i1 [[TOBOOL]]
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//
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// Handler block:
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// CHECK: call void @__ubsan_handle_invalid_builtin
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// CHECK-NEXT: unreachable
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//
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// Continuation block:
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// CHECK: call void @llvm.assume(i1 [[TOBOOL]])
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__builtin_assume(n);
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// CHECK: call void @__ubsan_handle_invalid_builtin
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__attribute__((assume(n)));
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}
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