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f07815e348
With regards to overrunning, the langref (llvm/docs/LangRef.rst)
specifies:
(llvm.experimental.vector.insert)
Elements ``idx`` through (``idx`` + num_elements(``subvec``) - 1)
must be valid ``vec`` indices. If this condition cannot be determined
statically but is false at runtime, then the result vector is
undefined.
(llvm.experimental.vector.extract)
Elements ``idx`` through (``idx`` + num_elements(result_type) - 1)
must be valid vector indices. If this condition cannot be determined
statically but is false at runtime, then the result vector is
undefined.
For the non-mixed cases (e.g. inserting/extracting a scalable into/from
another scalable, or inserting/extracting a fixed into/from another
fixed), it is possible to statically check whether or not the above
conditions are met. This was previously missing from the verifier, and
if the conditions were found to be false, the result of the
insertion/extraction would be replaced with an undef.
With regards to invalid indices, the langref (llvm/docs/LangRef.rst)
specifies:
(llvm.experimental.vector.insert)
``idx`` represents the starting element number at which ``subvec``
will be inserted. ``idx`` must be a constant multiple of
``subvec``'s known minimum vector length.
(llvm.experimental.vector.extract)
The ``idx`` specifies the starting element number within ``vec``
from which a subvector is extracted. ``idx`` must be a constant
multiple of the known-minimum vector length of the result type.
Similarly, these conditions were not previously enforced in the
verifier. In some circumstances, invalid indices were permitted
silently, and in other circumstances, an undef was spawned where a
verifier error would have been preferred.
This commit adds verifier checks to enforce the constraints above.
Differential Revision: https://reviews.llvm.org/D104468
73 lines
3.7 KiB
LLVM
73 lines
3.7 KiB
LLVM
; RUN: not opt -verify -S < %s 2>&1 >/dev/null | FileCheck %s
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;
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; Test that extractions/insertion indices are validated.
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;
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; CHECK: experimental_vector_extract index must be a constant multiple of the result type's known minimum vector length.
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define <4 x i32> @extract_idx_not_constant_multiple(<8 x i32> %vec) {
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%1 = call <4 x i32> @llvm.experimental.vector.extract.v4i32.v8i32(<8 x i32> %vec, i64 1)
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ret <4 x i32> %1
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}
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; CHECK: experimental_vector_insert index must be a constant multiple of the subvector's known minimum vector length.
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define <8 x i32> @insert_idx_not_constant_multiple(<8 x i32> %vec, <4 x i32> %subvec) {
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%1 = call <8 x i32> @llvm.experimental.vector.insert.v8i32.v4i32(<8 x i32> %vec, <4 x i32> %subvec, i64 2)
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ret <8 x i32> %1
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}
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;
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; Test that extractions/insertions which 'overrun' are captured.
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;
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; CHECK: experimental_vector_extract would overrun.
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define <3 x i32> @extract_overrun_fixed_fixed(<8 x i32> %vec) {
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%1 = call <3 x i32> @llvm.experimental.vector.extract.v8i32.v3i32(<8 x i32> %vec, i64 6)
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ret <3 x i32> %1
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}
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; CHECK: experimental_vector_extract would overrun.
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define <vscale x 3 x i32> @extract_overrun_scalable_scalable(<vscale x 8 x i32> %vec) {
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%1 = call <vscale x 3 x i32> @llvm.experimental.vector.extract.nxv8i32.nxv3i32(<vscale x 8 x i32> %vec, i64 6)
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ret <vscale x 3 x i32> %1
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}
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; We cannot statically check whether or not an extraction of a fixed vector
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; from a scalable vector would overrun, because we can't compare the sizes of
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; the two. Therefore, this function should not raise verifier errors.
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; CHECK-NOT: experimental_vector_extract
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define <3 x i32> @extract_overrun_scalable_fixed(<vscale x 8 x i32> %vec) {
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%1 = call <3 x i32> @llvm.experimental.vector.extract.nxv8i32.v3i32(<vscale x 8 x i32> %vec, i64 6)
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ret <3 x i32> %1
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}
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; CHECK: subvector operand of experimental_vector_insert would overrun the vector being inserted into.
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define <8 x i32> @insert_overrun_fixed_fixed(<8 x i32> %vec, <3 x i32> %subvec) {
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%1 = call <8 x i32> @llvm.experimental.vector.insert.v8i32.v3i32(<8 x i32> %vec, <3 x i32> %subvec, i64 6)
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ret <8 x i32> %1
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}
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; CHECK: subvector operand of experimental_vector_insert would overrun the vector being inserted into.
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define <vscale x 8 x i32> @insert_overrun_scalable_scalable(<vscale x 8 x i32> %vec, <vscale x 3 x i32> %subvec) {
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%1 = call <vscale x 8 x i32> @llvm.experimental.vector.insert.nxv8i32.nxv3i32(<vscale x 8 x i32> %vec, <vscale x 3 x i32> %subvec, i64 6)
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ret <vscale x 8 x i32> %1
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}
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; We cannot statically check whether or not an insertion of a fixed vector into
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; a scalable vector would overrun, because we can't compare the sizes of the
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; two. Therefore, this function should not raise verifier errors.
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; CHECK-NOT: experimental_vector_insert
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define <vscale x 8 x i32> @insert_overrun_scalable_fixed(<vscale x 8 x i32> %vec, <3 x i32> %subvec) {
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%1 = call <vscale x 8 x i32> @llvm.experimental.vector.insert.nxv8i32.v3i32(<vscale x 8 x i32> %vec, <3 x i32> %subvec, i64 6)
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ret <vscale x 8 x i32> %1
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}
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declare <vscale x 3 x i32> @llvm.experimental.vector.extract.nxv8i32.nxv3i32(<vscale x 8 x i32>, i64)
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declare <vscale x 8 x i32> @llvm.experimental.vector.insert.nxv8i32.nxv3i32(<vscale x 8 x i32>, <vscale x 3 x i32>, i64)
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declare <vscale x 8 x i32> @llvm.experimental.vector.insert.nxv8i32.v3i32(<vscale x 8 x i32>, <3 x i32>, i64)
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declare <3 x i32> @llvm.experimental.vector.extract.nxv8i32.v3i32(<vscale x 8 x i32>, i64)
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declare <3 x i32> @llvm.experimental.vector.extract.v8i32.v3i32(<8 x i32>, i64)
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declare <4 x i32> @llvm.experimental.vector.extract.v4i32.v8i32(<8 x i32>, i64)
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declare <8 x i32> @llvm.experimental.vector.insert.v8i32.v3i32(<8 x i32>, <3 x i32>, i64)
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declare <8 x i32> @llvm.experimental.vector.insert.v8i32.v4i32(<8 x i32>, <4 x i32>, i64)
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