> -----Original Message----- > From: H.J. Lu <[email protected]> > Sent: Thursday, August 20, 2026 9:47 AM > To: GCC Patches <[email protected]>; Uros Bizjak > <[email protected]>; Liu, Hongtao <[email protected]> > Subject: [PATCH] x86: Compile PR 88465 tests with -mtune=generic > > Compile PR 88465 tests with -mtune=generic to avoid > > FAIL: gcc.target/i386/avx512bw-pr88465.c scan-assembler-times > kxnor[dq][ \t] 2 > FAIL: gcc.target/i386/avx512dq-pr88465.c scan-assembler-times kxnorb[ \t] > 1 > FAIL: gcc.target/i386/avx512f-pr88465.c scan-assembler-times kxnorw[ \t] 1 > > caused by different code sequence from different default cost models.
It looks like an mis-optimization under tune=znver4, I check -mtune=sapphirerapids is ok. Assume kxnorb should be fastest way to move -1 to k register, not load it from constant pool. > > PR testsuite/126923 > * gcc.target/i386/avx512bw-pr88465.c (dg-options): Add -mtune=generic. > * gcc.target/i386/avx512dq-pr88465.c (dg-options): Likewise. > * gcc.target/i386/avx512f-pr88465.c (dg-options): Likewise. > > -- > H.J.
