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charset="us-ascii" Content-Transfer-Encoding: quoted-printable > -----Original Message----- > From: Richard Biener > Sent: Thursday, July 7, 2022 8:47 AM > To: Tamar Christina > Cc: gcc-patches@gcc.gnu.org; nd > Subject: RE: [PATCH]middle-end: don't lower past veclower [PR106063] >=20 > On Thu, 7 Jul 2022, Tamar Christina wrote: >=20 > > > -----Original Message----- > > > From: Richard Biener > > > Sent: Thursday, July 7, 2022 8:19 AM > > > To: Tamar Christina > > > Cc: gcc-patches@gcc.gnu.org; nd > > > Subject: Re: [PATCH]middle-end: don't lower past veclower [PR106063] > > > > > > On Tue, 5 Jul 2022, Tamar Christina wrote: > > > > > > > Hi All, > > > > > > > > My previous patch can cause a problem if the pattern matches after > > > > veclower as it may replace the construct with a vector sequence > > > > which the target may not directly support. > > > > > > > > As such don't perform the rewriting if after veclower. > > > > > > Note that when doing the rewriting before veclower to a variant not > > > supported by the target can cause veclower to generate absymal code. > > > In some cases we are very careful and try to at least preserve code > > > supported by the target over transforming that into a variant not > supported. > > > > > > That said, a better fix would be to check whether the target can > > > perform the new comparison. Before veclower it would be OK to do > > > the transform nevertheless in case it cannot do the original transfor= m. > > > > This last statement is somewhat confusing. Did you want me to change > > it such that before veclower the rewrite is always done and after > > veclowering only if the target supports it? > > > > Or did you want me to never do the rewrite if the target doesn't suppor= t it? >=20 > I meant before veclower you can do the rewrite if either the rewriting re= sult > is supported by the target OR if the original expression is _not_ support= ed by > the target. The latter case might be not too important to worry doing (i= t > would still canonicalize for those targets then). After veclower you can= only > rewrite under the former condition. >=20 Bootstrapped Regtested on aarch64-none-linux-gnu, x86_64-pc-linux-gnu and no issues. Ok for master? and backport to GCC 12? Thanks, Tamar gcc/ChangeLog: PR tree-optimization/106063 * match.pd: Only rewrite if target support it. gcc/testsuite/ChangeLog: PR tree-optimization/106063 * gcc.dg/pr106063.c: New test. --- inline copy of patch --- diff --git a/gcc/match.pd b/gcc/match.pd index 40c09bedadb89dabb6622559a8f69df5384e61fd..5800a105c3cdada9d5e1d801917= 6ebbe5969ccb0 100644 --- a/gcc/match.pd +++ b/gcc/match.pd @@ -6041,10 +6041,16 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT) (cmp (bit_and:c@2 @0 cst@1) integer_zerop) (with { tree csts =3D bitmask_inv_cst_vector_p (@1); } (if (csts && (VECTOR_TYPE_P (TREE_TYPE (@1)) || single_use (@2))) - (if (TYPE_UNSIGNED (TREE_TYPE (@1))) - (icmp @0 { csts; }) - (with { tree utype =3D unsigned_type_for (TREE_TYPE (@1)); } - (icmp (view_convert:utype @0) { csts; })))))))) + (with { auto optab =3D VECTOR_TYPE_P (TREE_TYPE (@1)) + ? optab_vector : optab_default; + tree utype =3D unsigned_type_for (TREE_TYPE (@1)); } + (if (target_supports_op_p (utype, icmp, optab) + || (optimize_vectors_before_lowering_p () + && (!target_supports_op_p (type, cmp, optab) + || !target_supports_op_p (type, BIT_AND_EXPR, optab)))) + (if (TYPE_UNSIGNED (TREE_TYPE (@1))) + (icmp @0 { csts; }) + (icmp (view_convert:utype @0) { csts; }))))))))) =20 /* When one argument is a constant, overflow detection can be simplified. Currently restricted to single use so as not to interfere too much with diff --git a/gcc/testsuite/gcc.dg/pr106063.c b/gcc/testsuite/gcc.dg/pr10606= 3.c new file mode 100644 index 0000000000000000000000000000000000000000..b23596724f6bb98c53af2dce77d= 31509bab10378 --- /dev/null +++ b/gcc/testsuite/gcc.dg/pr106063.c @@ -0,0 +1,9 @@ +/* { dg-do compile } */ +/* { dg-options "-O2 -fno-tree-forwprop --disable-tree-evrp" } */ +typedef __int128 __attribute__((__vector_size__ (16))) V; + +V +foo (V v) +{ + return (v & (V){15}) =3D=3D v; +} --_002_VI1PR08MB5325D0F4FAF9226F9C80EB8AFF829VI1PR08MB5325eurp_ Content-Type: application/octet-stream; name="rb15911.patch" Content-Description: rb15911.patch Content-Disposition: attachment; filename="rb15911.patch"; size=1699; creation-date="Fri, 08 Jul 2022 06:25:50 GMT"; modification-date="Fri, 08 Jul 2022 06:26:16 GMT" Content-Transfer-Encoding: base64 ZGlmZiAtLWdpdCBhL2djYy9tYXRjaC5wZCBiL2djYy9tYXRjaC5wZAppbmRleCA0MGMwOWJlZGFk Yjg5ZGFiYjY2MjI1NTlhOGY2OWRmNTM4NGU2MWZkLi41ODAwYTEwNWMzY2RhZGE5ZDVlMWQ4MDE5 MTc2ZWJiZTU5NjljY2IwIDEwMDY0NAotLS0gYS9nY2MvbWF0Y2gucGQKKysrIGIvZ2NjL21hdGNo LnBkCkBAIC02MDQxLDEwICs2MDQxLDE2IEBAIERFRklORV9JTlRfQU5EX0ZMT0FUX1JPVU5EX0ZO IChSSU5UKQogICAgKGNtcCAoYml0X2FuZDpjQDIgQDAgY3N0QDEpIGludGVnZXJfemVyb3ApCiAg ICAgKHdpdGggeyB0cmVlIGNzdHMgPSBiaXRtYXNrX2ludl9jc3RfdmVjdG9yX3AgKEAxKTsgfQog ICAgICAoaWYgKGNzdHMgJiYgKFZFQ1RPUl9UWVBFX1AgKFRSRUVfVFlQRSAoQDEpKSB8fCBzaW5n bGVfdXNlIChAMikpKQotICAgICAgKGlmIChUWVBFX1VOU0lHTkVEIChUUkVFX1RZUEUgKEAxKSkp Ci0gICAgICAgKGljbXAgQDAgeyBjc3RzOyB9KQotICAgICAgICh3aXRoIHsgdHJlZSB1dHlwZSA9 IHVuc2lnbmVkX3R5cGVfZm9yIChUUkVFX1RZUEUgKEAxKSk7IH0KLQkgKGljbXAgKHZpZXdfY29u dmVydDp1dHlwZSBAMCkgeyBjc3RzOyB9KSkpKSkpKSkKKyAgICAgICh3aXRoIHsgYXV0byBvcHRh YiA9IFZFQ1RPUl9UWVBFX1AgKFRSRUVfVFlQRSAoQDEpKQorCQkJID8gb3B0YWJfdmVjdG9yIDog b3B0YWJfZGVmYXVsdDsKKwkgICAgICB0cmVlIHV0eXBlID0gdW5zaWduZWRfdHlwZV9mb3IgKFRS RUVfVFlQRSAoQDEpKTsgfQorICAgICAgIChpZiAodGFyZ2V0X3N1cHBvcnRzX29wX3AgKHV0eXBl LCBpY21wLCBvcHRhYikKKwkgICAgfHwgKG9wdGltaXplX3ZlY3RvcnNfYmVmb3JlX2xvd2VyaW5n X3AgKCkKKwkJJiYgKCF0YXJnZXRfc3VwcG9ydHNfb3BfcCAodHlwZSwgY21wLCBvcHRhYikKKwkJ ICAgIHx8ICF0YXJnZXRfc3VwcG9ydHNfb3BfcCAodHlwZSwgQklUX0FORF9FWFBSLCBvcHRhYikp KSkKKwkoaWYgKFRZUEVfVU5TSUdORUQgKFRSRUVfVFlQRSAoQDEpKSkKKwkgKGljbXAgQDAgeyBj c3RzOyB9KQorCSAoaWNtcCAodmlld19jb252ZXJ0OnV0eXBlIEAwKSB7IGNzdHM7IH0pKSkpKSkp KSkKIAogLyogV2hlbiBvbmUgYXJndW1lbnQgaXMgYSBjb25zdGFudCwgb3ZlcmZsb3cgZGV0ZWN0 aW9uIGNhbiBiZSBzaW1wbGlmaWVkLgogICAgQ3VycmVudGx5IHJlc3RyaWN0ZWQgdG8gc2luZ2xl IHVzZSBzbyBhcyBub3QgdG8gaW50ZXJmZXJlIHRvbyBtdWNoIHdpdGgKZGlmZiAtLWdpdCBhL2dj Yy90ZXN0c3VpdGUvZ2NjLmRnL3ByMTA2MDYzLmMgYi9nY2MvdGVzdHN1aXRlL2djYy5kZy9wcjEw NjA2My5jCm5ldyBmaWxlIG1vZGUgMTAwNjQ0CmluZGV4IDAwMDAwMDAwMDAwMDAwMDAwMDAwMDAw MDAwMDAwMDAwMDAwMDAwMDAuLmIyMzU5NjcyNGY2YmI5OGM1M2FmMmRjZTc3ZDMxNTA5YmFiMTAz NzgKLS0tIC9kZXYvbnVsbAorKysgYi9nY2MvdGVzdHN1aXRlL2djYy5kZy9wcjEwNjA2My5jCkBA IC0wLDAgKzEsOSBAQAorLyogeyBkZy1kbyBjb21waWxlIH0gKi8KKy8qIHsgZGctb3B0aW9ucyAi LU8yIC1mbm8tdHJlZS1mb3J3cHJvcCAtLWRpc2FibGUtdHJlZS1ldnJwIiB9ICovCit0eXBlZGVm IF9faW50MTI4IF9fYXR0cmlidXRlX18oKF9fdmVjdG9yX3NpemVfXyAoMTYpKSkgVjsKKworVgor Zm9vIChWIHYpCit7CisgIHJldHVybiAodiAmIChWKXsxNX0pID09IHY7Cit9Cg== --_002_VI1PR08MB5325D0F4FAF9226F9C80EB8AFF829VI1PR08MB5325eurp_--