[sync] PR-320: Backport some patches on EPOL gcc-12 to GCC-12 for openEuler. · Pull Request !322 · src-openEuler/gcc

### 1. Origin pull request:
https://gitee.com/src-openeuler/gcc/pulls/320

### 2. Original pull request related issue(s):

### 3. Original pull request related commit(s):
| Sha | Datetime | Message |
|---|---|---|
|[ad4ee2e6](https://gitee.com/src-openeuler/gcc/commits/ad4ee2e6e9bc79e159a22ef422bf3be74060e47d)|2023-08-11 10:26:25 +0800 CST|[Sync] i386: Only enable small loop unrolling in backend [PR 107692] Followed by the discussion in pr107692, -munroll-only-small-loops Does not turns on/off -funroll-loops, and current check in pass_rtl_unroll_loops::gate would cause -fno-unroll-loops do not take effect. Revert the change about targetm.loop_unroll_adjust and apply the backend option change to strictly follow the rule that -funroll-loops takes full control of loop unrolling, and munroll-only-small-loops just change its behavior to unroll small size loops. gcc/ChangeLog: 	PR target/107692 	* common/config/i386/i386-common.cc (ix86_optimization_table): 	Enable loop unroll O2, disable -fweb and -frename-registers 	by default. 	* config/i386/i386-options.cc 	(ix86_override_options_after_change): 	Disable small loop unroll when funroll-loops enabled, reset 	cunroll_grow_size when it is not explicitly enabled. 	(ix86_option_override_internal): Call 	ix86_override_options_after_change instead of calling 	ix86_recompute_optlev_based_flags and ix86_default_align 	separately. 	* config/i386/i386.cc (ix86_loop_unroll_adjust): Adjust unroll 	factor if -munroll-only-small-loops enabled. 	* loop-init.cc (pass_rtl_unroll_loops::gate): Do not enable 	loop unrolling for -O2-speed. 	(pass_rtl_unroll_loops::execute): Rmove 	targetm.loop_unroll_adjust check. gcc/testsuite/ChangeLog: 	PR target/107692 	* gcc.dg/guality/loop-1.c: Remove additional option for ia32. 	* gcc.target/i386/pr86270.c: Add -fno-unroll-loops. 	* gcc.target/i386/pr93002.c: Likewise. |
|[79c6c64b](https://gitee.com/src-openeuler/gcc/commits/79c6c64bfe6cd9e6def74b1486b6978bfb922d4f)|2023-08-11 10:24:40 +0800 CST|[Sync] Enable small loop unrolling for O2 Modern processors has multiple way instruction decoders For x86, icelake/zen3 has 5 uops, so for small loop with <= 4 instructions (usually has 3 uops with a cmp/jmp pair that can be macro-fused), the decoder would have 2 uops bubble for each iteration and the pipeline could not be fully utilized. Therefore, this patch enables loop unrolling for small size loop at O2 to fullfill the decoder as much as possible. It turns on rtl loop unrolling when targetm.loop_unroll_adjust exists and O2 plus speed only. In x86 backend the default behavior is to unroll small loops with less than 4 insns by 1 time. This improves 548.exchange2 by 9% on icelake and 7.4% on zen3 with 0.9% codesize increment. For other benchmarks the variants are minor and overall codesize increased by 0.2%. The kernel image size increased by 0.06%, and no impact on eembc. gcc/ChangeLog: 	* common/config/i386/i386-common.cc (ix86_optimization_table): 	Enable small loop unroll at O2 by default. 	* config/i386/i386.cc (ix86_loop_unroll_adjust): Adjust unroll 	factor if -munroll-only-small-loops enabled and -funroll-loops/ 	-funroll-all-loops are disabled. 	* config/i386/i386.h (struct processor_costs): Add 2 field 	small_unroll_ninsns and small_unroll_factor. 	* config/i386/i386.opt: Add -munroll-only-small-loops. 	* doc/invoke.texi: Document -munroll-only-small-loops. 	* loop-init.cc (pass_rtl_unroll_loops::gate): Enable rtl 	loop unrolling for -O2-speed and above if target hook 	loop_unroll_adjust exists. 	(pass_rtl_unroll_loops::execute): Set UAP_UNROLL flag 	when target hook loop_unroll_adjust exists. 	* config/i386/x86-tune-costs.h: Update all processor costs 	with small_unroll_ninsns = 4 and small_unroll_factor = 2. gcc/testsuite/ChangeLog: 	* gcc.dg/guality/loop-1.c: Add additional option 	-mno-unroll-only-small-loops. 	* gcc.target/i386/pr86270.c: Add -mno-unroll-only-small-loops. 	* gcc.target/i386/pr93002.c: Likewise. |
|[8cf4a6a8](https://gitee.com/src-openeuler/gcc/commits/8cf4a6a8c34172f371c1d9e6e375970b361f7007)|2023-08-11 10:21:14 +0800 CST|[Sync] Add attribute hot judgement for INLINE_HINT_known_hot hint. We set up INLINE_HINT_known_hot hint only when we have profile feedback, now add function attribute judgement for it, when both caller and callee have __attribute__((hot)), we will also set up INLINE_HINT_known_hot hint for it. With this patch applied, ADL Multi-copy: 538.imagic_r 16.7% ICX Multi-copy: 538.imagic_r 15.2% CLX Multi-copy: 538.imagic_r 12.7% Znver3 Multi-copy: 538.imagic_r 10.6% Arm Multi-copy: 538.imagic_r 13.4% gcc/ChangeLog 	* ipa-inline-analysis.cc (do_estimate_edge_time): Add function attribute 	judgement for INLINE_HINT_known_hot hint. gcc/testsuite/ChangeLog: 	* gcc.dg/ipa/inlinehint-6.c: New test. |

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