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Add the -ftree-loop-if-convert flag. 

2010-07-08  Sebastian Pop  <sebastian.pop@amd.com>

	* common.opt (ftree-loop-if-convert): New flag.
	* doc/invoke.texi (ftree-loop-if-convert): Documented.
	* tree-if-conv.c (gate_tree_if_conversion): Enable if-conversion
	when flag_tree_loop_if_convert is set.

From-SVN: r161963
This commit is contained in:
Sebastian Pop 2010-07-08 16:37:49 +00:00 committed by Sebastian Pop
parent f8e1995a5b
commit 384a5197cb
4 changed files with 26 additions and 5 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2010-07-08 Sebastian Pop <sebastian.pop@amd.com>
* common.opt (ftree-loop-if-convert): New flag.
* doc/invoke.texi (ftree-loop-if-convert): Documented.
* tree-if-conv.c (gate_tree_if_conversion): Enable if-conversion
when flag_tree_loop_if_convert is set.
2010-07-08 Uros Bizjak <ubizjak@gmail.com>
* config/i386/i386.c: Use short syntax for function calls

4
gcc/common.opt
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@ -653,6 +653,10 @@ fif-conversion2
Common Report Var(flag_if_conversion2) Optimization
Perform conversion of conditional jumps to conditional execution
ftree-loop-if-convert
Common Report Var(flag_tree_loop_if_convert) Init(-1) Optimization
Convert conditional jumps in innermost loops to branchless equivalents
; -finhibit-size-directive inhibits output of .size for ELF.
; This is used only for compiling crtstuff.c,
; and it may be extended to other effects

15
gcc/doc/invoke.texi
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@ -342,7 +342,7 @@ Objective-C and Objective-C++ Dialects}.
-fearly-inlining -fipa-sra -fexpensive-optimizations -ffast-math @gol
-ffinite-math-only -ffloat-store -fexcess-precision=@var{style} @gol
-fforward-propagate -ffunction-sections @gol
-fgcse -fgcse-after-reload -fgcse-las -fgcse-lm @gol
-fgcse -fgcse-after-reload -fgcse-las -fgcse-lm -fgraphite-identity @gol
-fgcse-sm -fif-conversion -fif-conversion2 -findirect-inlining @gol
-finline-functions -finline-functions-called-once -finline-limit=@var{n} @gol
-finline-small-functions -fipa-cp -fipa-cp-clone -fipa-matrix-reorg -fipa-pta @gol
@ -352,7 +352,7 @@ Objective-C and Objective-C++ Dialects}.
-fira-loop-pressure -fno-ira-share-save-slots @gol
-fno-ira-share-spill-slots -fira-verbose=@var{n} @gol
-fivopts -fkeep-inline-functions -fkeep-static-consts @gol
-floop-block -floop-interchange -floop-strip-mine -fgraphite-identity @gol
-floop-block -floop-interchange -floop-strip-mine @gol
-floop-parallelize-all -flto -flto-compression-level -flto-report -fltrans @gol
-fltrans-output-list -fmerge-all-constants -fmerge-constants -fmodulo-sched @gol
-fmodulo-sched-allow-regmoves -fmove-loop-invariants -fmudflap @gol
@ -382,8 +382,8 @@ Objective-C and Objective-C++ Dialects}.
-fsplit-wide-types -fstack-protector -fstack-protector-all @gol
-fstrict-aliasing -fstrict-overflow -fthread-jumps -ftracer @gol
-ftree-builtin-call-dce -ftree-ccp -ftree-ch -ftree-copy-prop @gol
-ftree-copyrename -ftree-dce @gol
-ftree-dominator-opts -ftree-dse -ftree-forwprop -ftree-fre -ftree-loop-im @gol
-ftree-copyrename -ftree-dce -ftree-dominator-opts -ftree-dse @gol
-ftree-forwprop -ftree-fre -ftree-loop-if-convert -ftree-loop-im @gol
-ftree-phiprop -ftree-loop-distribution @gol
-ftree-loop-ivcanon -ftree-loop-linear -ftree-loop-optimize @gol
-ftree-parallelize-loops=@var{n} -ftree-pre -ftree-pta -ftree-reassoc @gol
@ -6883,6 +6883,13 @@ profitable to parallelize the loops.
Compare the results of several data dependence analyzers. This option
is used for debugging the data dependence analyzers.
@item -ftree-loop-if-convert
Attempt to transform conditional jumps in the innermost loops to
branch-less equivalents. The intent is to remove control-flow from
the innermost loops in order to improve the ability of the
vectorization pass to handle these loops. This is enabled by default
if vectorization is enabled.
@item -ftree-loop-distribution
Perform loop distribution. This flag can improve cache performance on
big loop bodies and allow further loop optimizations, like

5
gcc/tree-if-conv.c
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@ -1239,10 +1239,13 @@ main_tree_if_conversion (void)
return changed ? TODO_cleanup_cfg : 0;
}
/* Returns true when the if-conversion pass is enabled. */
static bool
gate_tree_if_conversion (void)
{
return flag_tree_vectorize != 0;
return ((flag_tree_vectorize && flag_tree_loop_if_convert != 0)
|| flag_tree_loop_if_convert == 1);
}
struct gimple_opt_pass pass_if_conversion =