invoke.texi (-fconserve-stack): Document.
* invoke.texi (-fconserve-stack): Document. * opts.c (decode_options): Handle conserve_stack. * common.opt (fconvserve_stack): New. From-SVN: r140362
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@ -1,3 +1,9 @@
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2008-09-14 Jan Hubicka <jh@suse.cz>
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* invoke.texi (-fconserve-stack): Document.
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* opts.c (decode_options): Handle conserve_stack.
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* common.opt (fconvserve_stack): New.
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2008-09-14 David Edelsohn <edelsohn@gnu.org>
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2008-09-14 David Edelsohn <edelsohn@gnu.org>
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* config.host: Add x-aix to host_xmake_file.
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* config.host: Add x-aix to host_xmake_file.
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@ -385,6 +385,10 @@ fcommon
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Common Report Var(flag_no_common,0) Optimization
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Common Report Var(flag_no_common,0) Optimization
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Do not put uninitialized globals in the common section
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Do not put uninitialized globals in the common section
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fconserve-stack
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Common Var(flag_conserve_stack,0) Optimization
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Do not perform optimizations increasing noticeably stack usage
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fcprop-registers
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fcprop-registers
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Common Report Var(flag_cprop_registers) Optimization
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Common Report Var(flag_cprop_registers) Optimization
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Perform a register copy-propagation optimization pass
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Perform a register copy-propagation optimization pass
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@ -323,8 +323,8 @@ Objective-C and Objective-C++ Dialects}.
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-falign-labels[=@var{n}] -falign-loops[=@var{n}] -fassociative-math @gol
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-falign-labels[=@var{n}] -falign-loops[=@var{n}] -fassociative-math @gol
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-fauto-inc-dec -fbranch-probabilities -fbranch-target-load-optimize @gol
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-fauto-inc-dec -fbranch-probabilities -fbranch-target-load-optimize @gol
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-fbranch-target-load-optimize2 -fbtr-bb-exclusive -fcaller-saves @gol
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-fbranch-target-load-optimize2 -fbtr-bb-exclusive -fcaller-saves @gol
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-fcheck-data-deps -fcprop-registers -fcrossjumping -fcse-follow-jumps @gol
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-fcheck-data-deps -fconserve-stack -fcprop-registers -fcrossjumping @gol
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-fcse-skip-blocks -fcx-fortran-rules -fcx-limited-range @gol
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-fcse-follow-jumps -fcse-skip-blocks -fcx-fortran-rules -fcx-limited-range @gol
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-fdata-sections -fdce -fdce @gol
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-fdata-sections -fdce -fdce @gol
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-fdelayed-branch -fdelete-null-pointer-checks -fdse -fdse @gol
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-fdelayed-branch -fdelete-null-pointer-checks -fdse -fdse @gol
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-fearly-inlining -fexpensive-optimizations -ffast-math @gol
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-fearly-inlining -fexpensive-optimizations -ffast-math @gol
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@ -5871,6 +5871,13 @@ those which have no call-preserved registers to use instead.
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Enabled at levels @option{-O2}, @option{-O3}, @option{-Os}.
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Enabled at levels @option{-O2}, @option{-O3}, @option{-Os}.
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@item -fconserve-stack
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@opindex fconserve-stack
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Attempt to minimize stack usage. The compiler will attempt to use less
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stack space, even if that makes the program slower. This option
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implies setting the @option{large-stack-frame} parameter to 100
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and the @option{large-stack-frame-growth} parameter to 400.
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@item -ftree-reassoc
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@item -ftree-reassoc
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@opindex ftree-reassoc
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@opindex ftree-reassoc
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Perform reassociation on trees. This flag is enabled by default
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Perform reassociation on trees. This flag is enabled by default
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@ -1112,6 +1112,14 @@ decode_options (unsigned int argc, const char **argv)
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optimization_current_node = optimization_default_node;
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optimization_current_node = optimization_default_node;
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first_time_p = false;
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first_time_p = false;
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}
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}
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if (flag_conserve_stack)
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{
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if (!PARAM_SET_P (PARAM_LARGE_STACK_FRAME))
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PARAM_VALUE (PARAM_LARGE_STACK_FRAME) = 100;
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if (!PARAM_SET_P (PARAM_STACK_FRAME_GROWTH))
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PARAM_VALUE (PARAM_STACK_FRAME_GROWTH) = 40;
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}
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}
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}
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#define LEFT_COLUMN 27
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#define LEFT_COLUMN 27
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