File: constantexpr-fneg.c

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// RUN: %clang_cc1 -emit-llvm-bc -disable-llvm-passes -o %t.bc %s
// RUN: llvm-dis %t.bc -o - | FileCheck %s

// Test case for PR45426. Make sure we do not crash while writing bitcode
// containing a simplify-able fneg constant expression.
//
// CHECK-LABEL define i32 @main()
// CHECK:      entry:
// CHECK-NEXT:   %retval = alloca i32
// CHECK-NEXT:   store i32 0, ptr %retval
// CHECK-NEXT:   [[CMP:%.*]] = icmp ne ptr @b, @a
// CHECK-NEXT:   [[ZEXT:%.*]] = zext i1 [[CMP]] to i32
// CHECK-NEXT:   [[SITOFP:%.*]] = sitofp i32 [[ZEXT]] to float
// CHECK-NEXT:   [[LV:%.*]] = load ptr, ptr @c
// CHECK-NEXT:   store float [[SITOFP]], ptr [[LV]], align 4
// CHECK-NEXT:   [[FNEG:%.*]] = fneg float [[SITOFP]]
// CHECK-NEXT:   [[CONV:%.*]] = fptosi float [[FNEG]] to i32
// CHECK-NEXT:   ret i32 [[CONV]]

int a[], b;
float *c;
int main(void) {
  return -(*c = &b != a);
}