48 lines
1.5 KiB
C
48 lines
1.5 KiB
C
// RUN: %clang_cc1 -S %s -emit-llvm -o - | FileCheck %s
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// RUN: %clang_cc1 -S %s -emit-llvm -triple i686-unknown-unknown -o - | FileCheck %s
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// RUN: %clang_cc1 -S %s -emit-llvm -triple x86_64-unknown-unknown -o - | FileCheck %s
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#include <stdint.h>
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// This test is meant to verify code that handles the 'p = nullptr + n' idiom
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// used by some versions of glibc and gcc. This is undefined behavior but
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// it is intended there to act like a conversion from a pointer-sized integer
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// to a pointer, and we would like to tolerate that.
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#define NULLPTRI8 ((int8_t*)0)
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// This should get the inttoptr instruction.
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int8_t *test1(intptr_t n) {
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return NULLPTRI8 + n;
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}
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// CHECK-LABEL: test1
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// CHECK: inttoptr
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// CHECK-NOT: getelementptr
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// This doesn't meet the idiom because the element type is larger than a byte.
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int16_t *test2(intptr_t n) {
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return (int16_t*)0 + n;
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}
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// CHECK-LABEL: test2
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// CHECK: getelementptr
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// CHECK-NOT: inttoptr
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// This doesn't meet the idiom because the offset is subtracted.
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int8_t* test3(intptr_t n) {
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return NULLPTRI8 - n;
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}
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// CHECK-LABEL: test3
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// CHECK: getelementptr
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// CHECK-NOT: inttoptr
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// This checks the case where the offset isn't pointer-sized.
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// The front end will implicitly cast the offset to an integer, so we need to
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// make sure that doesn't cause problems on targets where integers and pointers
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// are not the same size.
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int8_t *test4(int8_t b) {
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return NULLPTRI8 + b;
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}
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// CHECK-LABEL: test4
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// CHECK: inttoptr
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// CHECK-NOT: getelementptr
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