derek.holloway
7502bf64a4
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81 lines
3.9 KiB
C++
81 lines
3.9 KiB
C++
// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fclangir -emit-cir %s -o %t.cir
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// RUN: FileCheck --input-file=%t.cir %s
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// Should generate basic pointer arithmetics.
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void foo(int *iptr, char *cptr, unsigned ustride) {
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iptr + 2;
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// CHECK: %[[#STRIDE:]] = cir.const #cir.int<2> : !s32i
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// CHECK: cir.ptr_stride %{{.+}}, %[[#STRIDE]] : (!cir.ptr<!s32i>, !s32i) -> !cir.ptr<!s32i>
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cptr + 3;
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// CHECK: %[[#STRIDE:]] = cir.const #cir.int<3> : !s32i
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// CHECK: cir.ptr_stride %{{.+}}, %[[#STRIDE]] : (!cir.ptr<!s8i>, !s32i) -> !cir.ptr<!s8i>
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// We need to assign to a temporary in these cases because otherwise
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// constant folding of the unary minus for thenegative stride value also
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// triggers erasing the unused result of the ptr_stride operation.
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int* iptr2 = iptr - 2;
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// CHECK: %[[#STRIDE:]] = cir.const #cir.int<-2> : !s32i
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// CHECK: cir.ptr_stride %{{.+}}, %[[#STRIDE]] : (!cir.ptr<!s32i>, !s32i) -> !cir.ptr<!s32i>
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char* cptr2 = cptr - 3;
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// CHECK: %[[#STRIDE:]] = cir.const #cir.int<-3> : !s32i
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// CHECK: cir.ptr_stride %{{.+}}, %[[#STRIDE]] : (!cir.ptr<!s8i>, !s32i) -> !cir.ptr<!s8i>
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iptr + ustride;
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// CHECK: %[[#STRIDE:]] = cir.load{{.*}} %{{.+}} : !cir.ptr<!u32i>, !u32i
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// CHECK: cir.ptr_stride %{{.+}}, %[[#STRIDE]] : (!cir.ptr<!s32i>, !u32i) -> !cir.ptr<!s32i>
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// Must convert unsigned stride to a signed one.
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iptr - ustride;
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// CHECK: %[[#STRIDE:]] = cir.load{{.*}} %{{.+}} : !cir.ptr<!u32i>, !u32i
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// CHECK: %[[#SIGNSTRIDE:]] = cir.cast integral %[[#STRIDE]] : !u32i -> !s32i
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// CHECK: %[[#NEGSTRIDE:]] = cir.minus %[[#SIGNSTRIDE]] : !s32i
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// CHECK: cir.ptr_stride %{{.+}}, %[[#NEGSTRIDE]] : (!cir.ptr<!s32i>, !s32i) -> !cir.ptr<!s32i>
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4 + iptr;
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// CHECK: %[[#STRIDE:]] = cir.const #cir.int<4> : !s32i
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// CHECK: cir.ptr_stride %{{.+}}, %[[#STRIDE]] : (!cir.ptr<!s32i>, !s32i) -> !cir.ptr<!s32i>
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iptr++;
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// CHECK: %[[#STRIDE:]] = cir.const #cir.int<1> : !s32i
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// CHECK: cir.ptr_stride %{{.+}}, %[[#STRIDE]] : (!cir.ptr<!s32i>, !s32i) -> !cir.ptr<!s32i>
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iptr--;
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// CHECK: %[[#STRIDE:]] = cir.const #cir.int<-1> : !s32i
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// CHECK: cir.ptr_stride %{{.+}}, %[[#STRIDE]] : (!cir.ptr<!s32i>, !s32i) -> !cir.ptr<!s32i>
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}
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void testPointerSubscriptAccess(int *ptr) {
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// CHECK: testPointerSubscriptAccess
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ptr[1];
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// CHECK: %[[#STRIDE:]] = cir.const #cir.int<1> : !s64i
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// CHECK: %[[#PTR:]] = cir.load{{.*}} %{{.+}} : !cir.ptr<!cir.ptr<!s32i>>, !cir.ptr<!s32i>
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// CHECK: cir.ptr_stride %[[#PTR]], %[[#STRIDE]] : (!cir.ptr<!s32i>, !s64i) -> !cir.ptr<!s32i>
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}
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void testPointerMultiDimSubscriptAccess(int **ptr) {
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// CHECK: testPointerMultiDimSubscriptAccess
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ptr[1][2];
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// CHECK: %[[#STRIDE2:]] = cir.const #cir.int<2> : !s64i
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// CHECK: %[[#STRIDE1:]] = cir.const #cir.int<1> : !s64i
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// CHECK: %[[#PTR1:]] = cir.load{{.*}} %{{.+}} : !cir.ptr<!cir.ptr<!cir.ptr<!s32i>>>, !cir.ptr<!cir.ptr<!s32i>>
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// CHECK: %[[#PTR2:]] = cir.ptr_stride %[[#PTR1]], %[[#STRIDE1]] : (!cir.ptr<!cir.ptr<!s32i>>, !s64i) -> !cir.ptr<!cir.ptr<!s32i>>
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// CHECK: %[[#PTR3:]] = cir.load{{.*}} %[[#PTR2]] : !cir.ptr<!cir.ptr<!s32i>>, !cir.ptr<!s32i>
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// CHECK: cir.ptr_stride %[[#PTR3]], %[[#STRIDE2]] : (!cir.ptr<!s32i>, !s64i) -> !cir.ptr<!s32i>
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}
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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 NULLPTRINT ((int*)0)
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// This should get the inttoptr instruction.
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int *testGnuNullPtrArithmetic(unsigned n) {
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// CHECK: testGnuNullPtrArithmetic
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return NULLPTRINT + n;
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// CHECK: %[[NULLPTR:.*]] = cir.const #cir.ptr<null> : !cir.ptr<!s32i>
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// CHECK: %[[N:.*]] = cir.load{{.*}} %{{.*}} : !cir.ptr<!u32i>, !u32i
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// CHECK: %[[RESULT:.*]] = cir.ptr_stride %[[NULLPTR]], %[[N]] : (!cir.ptr<!s32i>, !u32i) -> !cir.ptr<!s32i>
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}
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