forked from OSchip/llvm-project
29 lines
1.2 KiB
C
29 lines
1.2 KiB
C
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// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -fsanitize=unsigned-shift-base,shift-exponent %s -emit-llvm -o - | FileCheck %s
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// CHECK-LABEL: lsh_overflow(
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unsigned lsh_overflow(unsigned a, unsigned b) {
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// CHECK: %[[RHS_INBOUNDS:.*]] = icmp ule i32 %[[RHS:.*]], 31
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// CHECK-NEXT: br i1 %[[RHS_INBOUNDS]], label %[[CHECK_BB:.*]], label %[[CONT_BB:.*]],
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// CHECK: [[CHECK_BB]]:
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// CHECK-NEXT: %[[SHIFTED_OUT_WIDTH:.*]] = sub nuw nsw i32 31, %[[RHS]]
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// CHECK-NEXT: %[[SHIFTED_OUT:.*]] = lshr i32 %[[LHS:.*]], %[[SHIFTED_OUT_WIDTH]]
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// CHECK-NEXT: %[[SHIFTED_OUT_NOT_SIGN:.*]] = lshr i32 %[[SHIFTED_OUT]], 1
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// CHECK-NEXT: %[[NO_OVERFLOW:.*]] = icmp eq i32 %[[SHIFTED_OUT_NOT_SIGN]], 0
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// CHECK-NEXT: br label %[[CONT_BB]]
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// CHECK: [[CONT_BB]]:
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// CHECK-NEXT: %[[VALID_BASE:.*]] = phi i1 [ true, {{.*}} ], [ %[[NO_OVERFLOW]], %[[CHECK_BB]] ]
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// CHECK-NEXT: %[[VALID:.*]] = and i1 %[[RHS_INBOUNDS]], %[[VALID_BASE]]
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// CHECK-NEXT: br i1 %[[VALID]]
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// CHECK: call void @__ubsan_handle_shift_out_of_bounds
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// CHECK-NOT: call void @__ubsan_handle_shift_out_of_bounds
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// CHECK: %[[RET:.*]] = shl i32 %[[LHS]], %[[RHS]]
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// CHECK-NEXT: ret i32 %[[RET]]
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return a << b;
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}
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