File: cxx2a-left-shift.cpp

package info (click to toggle)
llvm-toolchain-19 1%3A19.1.7-3
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 1,998,520 kB
  • sloc: cpp: 6,951,680; ansic: 1,486,157; asm: 913,598; python: 232,024; f90: 80,126; objc: 75,281; lisp: 37,276; pascal: 16,990; sh: 10,009; ml: 5,058; perl: 4,724; awk: 3,523; makefile: 3,167; javascript: 2,504; xml: 892; fortran: 664; cs: 573
file content (19 lines) | stat: -rw-r--r-- 763 bytes parent folder | download | duplicates (23) 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
 
// RUN: %clang_cc1 -std=c++2a -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s --check-prefixes=CHECK,REGULAR
// RUN: %clang_cc1 -std=c++2a -fsanitize=shift-base,shift-exponent -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s --check-prefixes=CHECK,SANITIZED

// CHECK-LABEL: @_Z12lsh_overflow
int lsh_overflow(int a, int b) {
  // SANITIZED: %[[RHS_INBOUNDS:.*]] = icmp ule i32 %[[RHS:.*]], 31
  // SANITIZED-NEXT: br i1 %[[RHS_INBOUNDS]], label %[[VALID:.*]], label

  // SANITIZED: call void @__ubsan_handle_shift_out_of_bounds

  // No check for the LHS here.
  // SANITIZED: [[VALID]]:
  // SANITIZED-NEXT: shl i32 %
  // SANITIZED-NEXT: ret i32

  // Just ensure there's no nsw nuw flags here.
  // REGULAR: shl i32 %
  return a << b;
}