https://gcc.gnu.org/g:070bbc5842f64b36299c264c137e4ee414da1ddc
commit r15-8680-g070bbc5842f64b36299c264c137e4ee414da1ddc
Author: Georg-Johann Lay <a...@gjlay.de>
Date: Sun Mar 23 12:58:54 2025 +0100
AVR: Clarify some optimization options.
gcc/
* doc/invoke.texi (AVR Optimization Options)
<-maccumulate-args>: Refer to -fdefer-pop.
<-muse-nonzero-bits>: Re-formulate what the option does.
Diff:
---
gcc/doc/invoke.texi | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 81bfacfc35d4..36b252be387f 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -24555,6 +24555,8 @@ Accumulate outgoing function arguments and
acquire/release the needed
stack space for outgoing function arguments once in function
prologue/epilogue. Without this option, outgoing arguments are pushed
before calling a function and popped afterwards.
+See also the @option{-fdefer-pop}
+@ref{Optimize Options,,optimization option}.
Popping the arguments after the function call can be expensive on
AVR so that accumulating the stack space might lead to smaller
@@ -24632,7 +24634,8 @@ This optimization is turned on per default for
@option{-O2} and higher.
@opindex muse-nonzero-bits
@item -muse-nonzero-bits
-Enable some patterns for bit optimizations that depend on specific values.
+Enable optimizations that are only possible when some bits in a
+register are always zero.
This optimization is turned on per default for @option{-O2} and higher.
@end table
