clang/test/CodeGen/constantexpr-fneg.c

   1 // RUN: %clang_cc1 -emit-llvm-bc -disable-llvm-passes -o %t.bc %s
   2 // RUN: llvm-dis %t.bc -o - | FileCheck %s
   3
   4 // Test case for PR45426. Make sure we do not crash while writing bitcode
   5 // containing a simplify-able fneg constant expression.
   6 //
   7 // CHECK-LABEL define i32 @main()
   8 // CHECK:      entry:
   9 // CHECK-NEXT:   %retval = alloca i32
  10 // CHECK-NEXT:   store i32 0, ptr %retval
  11 // CHECK-NEXT:   [[CMP:%.*]] = icmp ne ptr @b, @a
  12 // CHECK-NEXT:   [[ZEXT:%.*]] = zext i1 [[CMP]] to i32
  13 // CHECK-NEXT:   [[SITOFP:%.*]] = sitofp i32 [[ZEXT]] to float
  14 // CHECK-NEXT:   [[LV:%.*]] = load ptr, ptr @c
  15 // CHECK-NEXT:   store float [[SITOFP]], ptr [[LV]], align 4
  16 // CHECK-NEXT:   [[FNEG:%.*]] = fneg float [[SITOFP]]
  17 // CHECK-NEXT:   [[CONV:%.*]] = fptosi float [[FNEG]] to i32
  18 // CHECK-NEXT:   ret i32 [[CONV]]
  19
  20 int a[], b;
  21 float *c;
  22 int main(void) {
  23   return -(*c = &b != a);
  24 }