68 lines
2.4 KiB
Plaintext
68 lines
2.4 KiB
Plaintext
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--- invoke.texi.orig Tue Feb 17 10:54:05 1998
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+++ invoke.texi Tue Aug 11 13:29:38 1998
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@@ -115,7 +115,7 @@
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@smallexample
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-fsyntax-only -pedantic -pedantic-errors
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-w -W -Wall -Waggregate-return -Wbad-function-cast
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--Wcast-align -Wcast-qual -Wchar-subscript -Wcomment
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+-Wcast-align -Wcast-qual -Wchar-subscripts -Wcomment
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-Wconversion -Werror -Wformat
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-Wid-clash-@var{len} -Wimplicit -Wimplicit-int
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-Wimplicit-function-declarations -Wimport -Winline
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@@ -153,6 +153,7 @@
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-frerun-cse-after-loop -fschedule-insns
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-fschedule-insns2 -fstrength-reduce -fthread-jumps
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-funroll-all-loops -funroll-loops
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+-fmove-all-movables -freduce-all-givs -frerun-loop-opt
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-O -O0 -O1 -O2 -O3
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@end smallexample
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@@ -2284,6 +2285,47 @@
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Perform the optimization of loop unrolling. This is done for all loops
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and usually makes programs run more slowly. @samp{-funroll-all-loops}
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implies @samp{-fstrength-reduce} as well as @samp{-frerun-cse-after-loop}.
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+
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+@item -fmove-all-movables
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+Forces all invariant computations in loops to be moved
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+outside the loop.
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+This option is provided primarily to improve performance
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+for some Fortran code, though it might improve code written
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+in other languages.
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+
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+@emph{Note:} When compiling programs written in Fortran,
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+this option is enabled by default.
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+
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+Analysis of Fortran code optimization and the resulting
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+optimizations triggered by this option, and the
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+@samp{-freduce-all-givs} and @samp{-frerun-loop-opt}
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+options as well, were
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+contributed by Toon Moene (@code{toon@@moene.indiv.nluug.nl}).
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+
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+Please let us (@code{fortran@@gnu.ai.mit.edu})
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+know how use of these options affects
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+the performance of your production code.
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+We're very interested in code that runs @emph{slower}
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+when these options are @emph{enabled}.
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+
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+@item -freduce-all-givs
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+Forces all general-induction variables in loops to be
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+strength-reduced.
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+This option is provided primarily to improve performance
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+for some Fortran code, though it might improve code written
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+in other languages.
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+
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+@emph{Note:} When compiling programs written in Fortran,
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+this option is enabled by default.
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+
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+@item -frerun-loop-opt
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+Runs loop optimizations a second time.
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+This option is provided primarily to improve performance
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+for some Fortran code, though it might improve code written
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+in other languages.
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+
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+@emph{Note:} When compiling programs written in Fortran,
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+this option is enabled by default.
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@item -fno-peephole
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Disable any machine-specific peephole optimizations.
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