1 // RUN: %clang_cc1 -S %s -emit-llvm -o - | FileCheck %s 2 // RUN: %clang_cc1 -S %s -emit-llvm -triple i686-unknown-unknown -o - | FileCheck %s 3 // RUN: %clang_cc1 -S %s -emit-llvm -triple x86_64-unknown-unknown -o - | FileCheck %s 4 5 #include <stdint.h> 6 7 // This test is meant to verify code that handles the 'p = nullptr + n' idiom 8 // used by some versions of glibc and gcc. This is undefined behavior but 9 // it is intended there to act like a conversion from a pointer-sized integer 10 // to a pointer, and we would like to tolerate that. 11 12 #define NULLPTRI8 ((int8_t*)0) 13 14 // This should get the inttoptr instruction. 15 int8_t *test1(intptr_t n) { 16 return NULLPTRI8 + n; 17 } 18 // CHECK-LABEL: test1 19 // CHECK: inttoptr 20 // CHECK-NOT: getelementptr 21 22 // This doesn't meet the idiom because the element type is larger than a byte. 23 int16_t *test2(intptr_t n) { 24 return (int16_t*)0 + n; 25 } 26 // CHECK-LABEL: test2 27 // CHECK: getelementptr 28 // CHECK-NOT: inttoptr 29 30 // This doesn't meet the idiom because the offset is subtracted. 31 int8_t* test3(intptr_t n) { 32 return NULLPTRI8 - n; 33 } 34 // CHECK-LABEL: test3 35 // CHECK: getelementptr 36 // CHECK-NOT: inttoptr 37 38 // This checks the case where the offset isn't pointer-sized. 39 // The front end will implicitly cast the offset to an integer, so we need to 40 // make sure that doesn't cause problems on targets where integers and pointers 41 // are not the same size. 42 int8_t *test4(int8_t b) { 43 return NULLPTRI8 + b; 44 } 45 // CHECK-LABEL: test4 46 // CHECK: inttoptr 47 // CHECK-NOT: getelementptr 48