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| author | ktkachov <ktkachov@138bc75d-0d04-0410-961f-82ee72b054a4> | 2015-05-13 15:26:14 +0000 |
|---|---|---|
| committer | ktkachov <ktkachov@138bc75d-0d04-0410-961f-82ee72b054a4> | 2015-05-13 15:26:14 +0000 |
| commit | c3206272a57bf11384e4bfc1e8a2539903dbeda1 (patch) | |
| tree | e2d5e277b402d4d751638756eee12266bbada3e9 /gcc/params.def | |
| parent | debb7e7af1863e2da8f3ef61432f0fc16b2a928e (diff) | |
| download | gcc-c3206272a57bf11384e4bfc1e8a2539903dbeda1.tar.gz | |
[tree-ssa-math-opts] Expand pow (x, CONST) using square roots when possible
* params.def (PARAM_MAX_POW_SQRT_DEPTH): New param.
* tree-ssa-math-opts.c: Include params.h
(pow_synth_sqrt_info): New struct.
(representable_as_half_series_p): New function.
(get_fn_chain): Likewise.
(print_nested_fn): Likewise.
(dump_fractional_sqrt_sequence): Likewise.
(dump_integer_part): Likewise.
(expand_pow_as_sqrts): Likewise.
(gimple_expand_builtin_pow): Use above to attempt to expand
pow as series of square roots. Removed now unused variables.
* gcc.target/aarch64/pow-sqrt-synth-1.c: New test.
* gcc.dg/pow-sqrt.x: New file.
* gcc.dg/pow-sqrt-1.c: New test.
* gcc.dg/pow-sqrt-2.c: Likewise.
* gcc.dg/pow-sqrt-3.c: Likewise.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@223167 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/params.def')
| -rw-r--r-- | gcc/params.def | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/gcc/params.def b/gcc/params.def index 48b39a25041..3e4ba3ad6ce 100644 --- a/gcc/params.def +++ b/gcc/params.def @@ -262,6 +262,14 @@ DEFPARAM(PARAM_MAX_HOIST_DEPTH, "Maximum depth of search in the dominator tree for expressions to hoist", 30, 0, 0) + +/* When synthesizing expnonentiation by a real constant operations using square + roots, this controls how deep sqrt chains we are willing to generate. */ +DEFPARAM(PARAM_MAX_POW_SQRT_DEPTH, + "max-pow-sqrt-depth", + "Maximum depth of sqrt chains to use when synthesizing exponentiation by a real constant", + 5, 1, 32) + /* This parameter limits the number of insns in a loop that will be unrolled, and by how much the loop is unrolled. |