https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115517
--- Comment #11 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by hongtao Liu <liuho...@gcc.gnu.org>: https://gcc.gnu.org/g:e94e6ee495d95f29355bbc017214228a5e367638 commit r15-1740-ge94e6ee495d95f29355bbc017214228a5e367638 Author: liuhongt <hongtao....@intel.com> Date: Wed Jun 19 16:05:58 2024 +0800 Adjust testcase for the regressed testcases after obsolete of vcond{,u,eq}. > Richard suggests that we implement the "obvious" transforms like > inversion in the middle-end but if for example unsigned compares > are not supported the us_minus + eq + negative trick isn't on > that list. > > The main reason to restrict vec_cmp would be to avoid > a <= b ? c : d going with an unsupported vec_cmp but instead > do a > b ? d : c - the alternative is trying to fix this > on the RTL side via combine. I understand the non-native Yes, I have a patch which can fix most regressions via pattern match in combine. Still there is a situation that is difficult to deal with, mainly the optimization w/o sse4.1 . Because pblendvb/blendvps/blendvpd only exists under sse4.1, w/o sse4.1, it takes 3 instructions (pand,pandn,por) to simulate the vcond_mask, and the combine matches up to 4 instructions, which makes it currently impossible to use the combine to recover those optimizations in the vcond{,u,eq}.i.e min/max. In the case of sse 4.1 and above, there is basically no regression anymore. the regression testcases w/o sse4.1 FAIL: g++.target/i386/pr100637-1b.C -std=gnu++14 scan-assembler-times pcmpeqb 2 FAIL: g++.target/i386/pr100637-1b.C -std=gnu++17 scan-assembler-times pcmpeqb 2 FAIL: g++.target/i386/pr100637-1b.C -std=gnu++20 scan-assembler-times pcmpeqb 2 FAIL: g++.target/i386/pr100637-1b.C -std=gnu++98 scan-assembler-times pcmpeqb 2 FAIL: g++.target/i386/pr100637-1w.C -std=gnu++14 scan-assembler-times pcmpeqw 2 FAIL: g++.target/i386/pr100637-1w.C -std=gnu++17 scan-assembler-times pcmpeqw 2 FAIL: g++.target/i386/pr100637-1w.C -std=gnu++20 scan-assembler-times pcmpeqw 2 FAIL: g++.target/i386/pr100637-1w.C -std=gnu++98 scan-assembler-times pcmpeqw 2 FAIL: g++.target/i386/pr103861-1.C -std=gnu++14 scan-assembler-times pcmpeqb 2 FAIL: g++.target/i386/pr103861-1.C -std=gnu++17 scan-assembler-times pcmpeqb 2 FAIL: g++.target/i386/pr103861-1.C -std=gnu++20 scan-assembler-times pcmpeqb 2 FAIL: g++.target/i386/pr103861-1.C -std=gnu++98 scan-assembler-times pcmpeqb 2 FAIL: gcc.target/i386/pr88540.c scan-assembler minpd gcc/testsuite/ChangeLog: PR target/115517 * g++.target/i386/pr100637-1b.C: Add xfail and -mno-sse4.1. * g++.target/i386/pr100637-1w.C: Ditto. * g++.target/i386/pr103861-1.C: Ditto. * gcc.target/i386/pr88540.c: Ditto. * gcc.target/i386/pr103941-2.c: Add -mno-avx512f. * g++.target/i386/sse4_1-pr100637-1b.C: New test. * g++.target/i386/sse4_1-pr100637-1w.C: New test. * g++.target/i386/sse4_1-pr103861-1.C: New test. * gcc.target/i386/sse4_1-pr88540.c: New test.
