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// RUN: %clang_cc1 -fcatch-undefined-behavior -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s
// PR6805
// CHECK: @foo
void foo() {
union { int i; } u;
// CHECK: objectsize
// CHECK: icmp uge
u.i=1;
}
// CHECK: @bar
int bar(int *a) {
// CHECK: %[[SIZE:.*]] = call i64 @llvm.objectsize.i64
// CHECK-NEXT: icmp uge i64 %[[SIZE]], 4
// CHECK: %[[PTRINT:.*]] = ptrtoint
// CHECK-NEXT: %[[MISALIGN:.*]] = and i64 %[[PTRINT]], 3
// CHECK-NEXT: icmp eq i64 %[[MISALIGN]], 0
return *a;
}
// CHECK: @lsh_overflow
int lsh_overflow(int a, int b) {
// CHECK: %[[INBOUNDS:.*]] = icmp ule i32 %[[RHS:.*]], 31
// CHECK-NEXT: br i1 %[[INBOUNDS]]
// CHECK: %[[SHIFTED_OUT_WIDTH:.*]] = sub nuw nsw i32 31, %[[RHS]]
// CHECK-NEXT: %[[SHIFTED_OUT:.*]] = lshr i32 %[[LHS:.*]], %[[SHIFTED_OUT_WIDTH]]
// CHECK-NEXT: %[[NO_OVERFLOW:.*]] = icmp eq i32 %[[SHIFTED_OUT]], 0
// CHECK-NEXT: br i1 %[[NO_OVERFLOW]]
// CHECK: %[[RET:.*]] = shl i32 %[[LHS]], %[[RHS]]
// CHECK-NEXT: ret i32 %[[RET]]
return a << b;
}
// CHECK: @rsh_inbounds
int rsh_inbounds(int a, int b) {
// CHECK: %[[INBOUNDS:.*]] = icmp ult i32 %[[RHS:.*]], 32
// CHECK: br i1 %[[INBOUNDS]]
// CHECK: %[[RET:.*]] = ashr i32 %[[LHS]], %[[RHS]]
// CHECK-NEXT: ret i32 %[[RET]]
return a >> b;
}
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