http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53726
Bug #: 53726
Summary: [4.8 Regression] aes test performance drop for
eembc_2_0_peak_32
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: vbyakov...@gmail.com
After fix
r188261 | rguenth | 2012-06-06 13:45:27 +0400 (Wed, 06 Jun 2012) | 23 lines
2012-06-06 Richard Guenther <rguent...@suse.de>
PR tree-optimization/53081
* tree-data-ref.h (adjacent_store_dr_p): Rename to ...
(adjacent_dr_p): ... this and make it work for reads, too.
* tree-loop-distribution.c (enum partition_kind): Add PKIND_MEMCPY.
(struct partition_s): Change main_stmt to main_dr, add
secondary_dr member.
(build_size_arg_loc): Change to date data-reference and not
gimplify here.
(build_addr_arg_loc): New function split out from ...
(generate_memset_builtin): ... here. Use it and simplify.
(generate_memcpy_builtin): New function.
(generate_code_for_partition): Adjust.
(classify_partition): Streamline pattern detection. Detect
memcpy.
(ldist_gen): Adjust.
(tree_loop_distribution): Adjust seed statements for memcpy
recognition.
* gcc.dg/tree-ssa/ldist-20.c: New testcase.
* gcc.dg/tree-ssa/loop-19.c: Add -fno-tree-loop-distribute-patterns.
regression on Atom 11%, on Sundy Bridge 30%. The fix lead to unrecognition of
memcpy. Reduced test case and assemblers are attached. Command line to
reproduce
gcc -ansi -O3 -ffast-math -msse2 -mfpmath=sse -m32 -static -march=corei7
-mtune=corei7 test.c
