forked from OSchip/llvm-project
47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
// RUN: %clang_cc1 -fcatch-undefined-behavior -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s
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// PR6805
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// CHECK: @foo
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void foo() {
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union { int i; } u;
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// CHECK: objectsize
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// CHECK: icmp uge
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u.i=1;
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}
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// CHECK: @bar
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int bar(int *a) {
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// CHECK: %[[SIZE:.*]] = call i64 @llvm.objectsize.i64
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// CHECK-NEXT: icmp uge i64 %[[SIZE]], 4
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// CHECK: %[[PTRINT:.*]] = ptrtoint
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// CHECK-NEXT: %[[MISALIGN:.*]] = and i64 %[[PTRINT]], 3
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// CHECK-NEXT: icmp eq i64 %[[MISALIGN]], 0
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return *a;
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}
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// CHECK: @lsh_overflow
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int lsh_overflow(int a, int b) {
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// CHECK: %[[INBOUNDS:.*]] = icmp ule i32 %[[RHS:.*]], 31
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// CHECK-NEXT: br i1 %[[INBOUNDS]]
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// CHECK: %[[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: %[[NO_OVERFLOW:.*]] = icmp eq i32 %[[SHIFTED_OUT]], 0
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// CHECK-NEXT: br i1 %[[NO_OVERFLOW]]
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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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// CHECK: @rsh_inbounds
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int rsh_inbounds(int a, int b) {
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// CHECK: %[[INBOUNDS:.*]] = icmp ult i32 %[[RHS:.*]], 32
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// CHECK: br i1 %[[INBOUNDS]]
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// CHECK: %[[RET:.*]] = ashr 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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