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From: "nils.smeds at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/103438] Updated documentation for gcc Optimization
 command line options (sec 3.11)
Date: Fri, 26 Nov 2021 11:48:25 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103438

--- Comment #4 from Nils Smeds <nils.smeds at gmail dot com> ---
(In reply to Andrew Pinski from comment #1)
> -fprefetch-loop-arrays is not enabled by default on all targets.

$ gcc --version
gcc (GCC) 11.2.0
Copyright (C) 2021 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ for lvl in O0 O1 O2 O3 Os; do gcc -Q --help=3Doptimizer -$lvl hello.c >
level-$lvl-default-opt.txt  2>&1 ; done

$ grep fprefetch-loop-arrays level-O*-opt.txt
level-O0-default-opt.txt:  -fprefetch-loop-arrays               [enabled]
level-O1-default-opt.txt:  -fprefetch-loop-arrays               [enabled]
level-O2-default-opt.txt:  -fprefetch-loop-arrays               [enabled]
level-O3-default-opt.txt:  -fprefetch-loop-arrays               [enabled]
level-Os-default-opt.txt:  -fprefetch-loop-arrays               [enabled]

$ grep aggressive-loop level-O*-opt.txt
level-O0-default-opt.txt:  -faggressive-loop-optimizations      [enabled]
level-O1-default-opt.txt:  -faggressive-loop-optimizations      [enabled]
level-O2-default-opt.txt:  -faggressive-loop-optimizations      [enabled]
level-O3-default-opt.txt:  -faggressive-loop-optimizations      [enabled]
level-Os-default-opt.txt:  -faggressive-loop-optimizations      [enabled]

$ grep inline-functions   *txt
level-O0-default-opt.txt:  -finline-functions                   [disabled]
level-O0-default-opt.txt:  -finline-functions-called-once       [disabled]
level-O1-default-opt.txt:  -finline-functions                   [disabled]
level-O1-default-opt.txt:  -finline-functions-called-once       [enabled]
level-O2-default-opt.txt:  -finline-functions                   [enabled]
level-O2-default-opt.txt:  -finline-functions-called-once       [enabled]
level-O3-default-opt.txt:  -finline-functions                   [enabled]
level-O3-default-opt.txt:  -finline-functions-called-once       [enabled]
level-Os-default-opt.txt:  -finline-functions                   [enabled]
level-Os-default-opt.txt:  -finline-functions-called-once       [enabled]=