clang/test/CodeGen/wmemchr.c

   1 // RUN: %clang_cc1 %s -triple x86_64-pc-win32 -emit-llvm -o - | FileCheck %s
   2
   3 typedef __SIZE_TYPE__ size_t;
   4 typedef __WCHAR_TYPE__ wchar_t;
   5
   6 const wchar_t *wmemchr_test(const wchar_t *s, const wchar_t c, size_t n) {
   7   // CHECK-LABEL: define dso_local ptr @wmemchr_test
   8   // CHECK: [[S:%.*]] = load
   9   // CHECK: [[C:%.*]] = load
  10   // CHECK: [[N:%.*]] = load
  11   // CHECK: [[N0:%.*]] = icmp eq i64 [[N]], 0
  12   // CHECK: br i1 [[N0]], label %[[EXIT:.*]], label %[[EQ:.*]]
  13
  14   // CHECK: [[EQ]]:
  15   // CHECK: [[SP:%.*]] = phi ptr [ [[S]], %[[ENTRY:.*]] ], [ [[SN:.*]], %[[NEXT:.*]] ]
  16   // CHECK: [[NP:%.*]] = phi i64 [ [[N]], %[[ENTRY]] ], [ [[NN:.*]], %[[NEXT]] ]
  17   // CHECK: [[SL:%.*]] = load i16, ptr [[SP]], align 2
  18   // CHECK: [[RES:%.*]] = getelementptr inbounds i16, ptr [[SP]], i32 0
  19   // CHECK: [[CMPEQ:%.*]] = icmp eq i16 [[SL]], [[C]]
  20   // CHECK: br i1 [[CMPEQ]], label %[[EXIT]], label %[[LT:.*]]
  21
  22   // CHECK: [[NEXT]]:
  23   // CHECK: [[SN]] = getelementptr inbounds i16, ptr [[SP]], i32 1
  24   // CHECK: [[NN]] = sub i64 [[NP]], 1
  25   // CHECK: [[NN0:%.*]] = icmp eq i64 [[NN]], 0
  26   // CHECK: br i1 [[NN0]], label %[[EXIT]], label %[[EQ]]
  27   //
  28   // CHECK: [[EXIT]]:
  29   // CHECK: [[RV:%.*]] = phi ptr [ null, %[[ENTRY]] ], [ null, %[[NEXT]] ], [ [[RES]], %[[EQ]] ]
  30   // CHECK: ret ptr [[RV]]
  31   return __builtin_wmemchr(s, c, n);
  32 }