https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95021
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
CC| |rguenther at suse dot de
Last reconfirmed| |2020-05-09
Target Milestone|--- |10.2
Ever confirmed|0 |1
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
Need -msse2 to trigger the bug. This caused by r10-2807:
commit 48a31a09839b12127ce7c40d7adc4bd5bf1d3407
Author: Richard Biener <rguent...@suse.de>
Date: Mon Aug 26 10:35:59 2019 +0000
re PR target/91522 (STV is slow)
2019-08-26 Richard Biener <rguent...@suse.de>
PR target/91522
PR target/91527
* config/i386/i386-features.h (general_scalar_chain::defs_map):
New member.
(general_scalar_chain::replace_with_subreg): Remove.
(general_scalar_chain::replace_with_subreg_in_insn): Likewise.
(general_scalar_chain::convert_reg): Adjust signature.
* config/i386/i386-features.c (scalar_chain::add_insn): Do not
iterate over all defs of a reg.
(general_scalar_chain::replace_with_subreg): Remove.
(general_scalar_chain::replace_with_subreg_in_insn): Likewise.
(general_scalar_chain::make_vector_copies): Populate defs_map,
place copy only after defs that are used as vectors in the chain.
(general_scalar_chain::convert_reg): Emit a copy for a specific
def in a specific instruction.
(general_scalar_chain::convert_op): All reg uses are converted
here.
(general_scalar_chain::convert_insn): Emit copies for scalar
uses of defs here. Replace uses with the copies we created.
Replace and convert the def. Adjust REG_DEAD notes, remove
REG_EQUIV/EQUAL notes.
(general_scalar_chain::convert_registers): Only handle copies
into the chain here.
