clang/test/CodeGen/trapv.c

   1 // RUN: %clang_cc1 -triple x86_64-apple-darwin10 -ftrapv %s -emit-llvm -o - | FileCheck %s
   2
   3 unsigned int ui, uj, uk;
   4 int i, j, k;
   5
   6 // CHECK-LABEL: define{{.*}} void @test0()
   7 void test0(void) {
   8   // -ftrapv doesn't affect unsigned arithmetic.
   9   // CHECK:      [[T1:%.*]] = load i32, ptr @uj
  10   // CHECK-NEXT: [[T2:%.*]] = load i32, ptr @uk
  11   // CHECK-NEXT: [[T3:%.*]] = add i32 [[T1]], [[T2]]
  12   // CHECK-NEXT: store i32 [[T3]], ptr @ui
  13   ui = uj + uk;
  14
  15   // CHECK:      [[T1:%.*]] = load i32, ptr @j
  16   // CHECK-NEXT: [[T2:%.*]] = load i32, ptr @k
  17   // CHECK-NEXT: [[T3:%.*]] = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[T1]], i32 [[T2]])
  18   // CHECK-NEXT: [[T4:%.*]] = extractvalue { i32, i1 } [[T3]], 0
  19   // CHECK-NEXT: [[T5:%.*]] = extractvalue { i32, i1 } [[T3]], 1
  20   // CHECK-NEXT: [[T6:%.*]] = xor i1 [[T5]], true
  21   // CHECK-NEXT: br i1 [[T6]]
  22   // CHECK:      call void @llvm.ubsantrap(i8 0)
  23   i = j + k;
  24 }
  25
  26 // CHECK-LABEL: define{{.*}} void @test1()
  27 void test1(void) {
  28   extern void opaque(int);
  29   opaque(i++);
  30
  31   // CHECK:      [[T1:%.*]] = load i32, ptr @i
  32   // CHECK-NEXT: [[T2:%.*]] = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[T1]], i32 1)
  33   // CHECK-NEXT: [[T3:%.*]] = extractvalue { i32, i1 } [[T2]], 0
  34   // CHECK-NEXT: [[T4:%.*]] = extractvalue { i32, i1 } [[T2]], 1
  35   // CHECK-NEXT: [[T5:%.*]] = xor i1 [[T4]], true
  36   // CHECK-NEXT: br i1 [[T5]]
  37   // CHECK:      call void @llvm.ubsantrap(i8 0)
  38 }
  39
  40 // CHECK-LABEL: define{{.*}} void @test2()
  41 void test2(void) {
  42   extern void opaque(int);
  43   opaque(++i);
  44
  45   // CHECK:      [[T1:%.*]] = load i32, ptr @i
  46   // CHECK-NEXT: [[T2:%.*]] = call { i32, i1 } @llvm.sadd.with.overflow.i32(i32 [[T1]], i32 1)
  47   // CHECK-NEXT: [[T3:%.*]] = extractvalue { i32, i1 } [[T2]], 0
  48   // CHECK-NEXT: [[T4:%.*]] = extractvalue { i32, i1 } [[T2]], 1
  49   // CHECK-NEXT: [[T5:%.*]] = xor i1 [[T4]], true
  50   // CHECK-NEXT: br i1 [[T5]]
  51   // CHECK:      call void @llvm.ubsantrap(i8 0)
  52 }
  53
  54 // CHECK-LABEL: define{{.*}} void @test3(
  55 void test3(int a, int b, float c, float d) {
  56   // CHECK-NOT:  @llvm.trap
  57   (void)(a / b);
  58   (void)(a % b);
  59   (void)(c / d);
  60   // CHECK: }
  61 }