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| author | Uros Bizjak <ubizjak@gmail.com> | 2009-06-18 13:35:38 +0200 |
|---|---|---|
| committer | Uros Bizjak <uros@gcc.gnu.org> | 2009-06-18 13:35:38 +0200 |
| commit | 2c2f70e1f266b6582398248096feccaceb2dd70c (patch) | |
| tree | 904a11ef4efd2cdd11a40d4bba5529efb85e3085 /gcc/convert.c | |
| parent | f99098233b944542b3f78de9da395f220fe9d0cf (diff) | |
| download | gcc-2c2f70e1f266b6582398248096feccaceb2dd70c.tar.gz | |
convert.c (convert_to_integer): Convert (int)logb() into ilogb().
* convert.c (convert_to_integer): Convert (int)logb() into ilogb().
testsuite/ChangeLog:
* gcc.dg/builtins-65.c: New test.
From-SVN: r148653
Diffstat (limited to 'gcc/convert.c')
| -rw-r--r-- | gcc/convert.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/gcc/convert.c b/gcc/convert.c index b6a9d3dc531..8245e1647fb 100644 --- a/gcc/convert.c +++ b/gcc/convert.c @@ -482,6 +482,37 @@ convert_to_integer (tree type, tree expr) } } + /* Convert (int)logb(d) -> ilogb(d). */ + if (optimize + && flag_unsafe_math_optimizations + && !flag_trapping_math && !flag_errno_math && flag_finite_math_only + && integer_type_node + && (outprec > TYPE_PRECISION (integer_type_node) + || (outprec == TYPE_PRECISION (integer_type_node) + && !TYPE_UNSIGNED (type)))) + { + tree s_expr = strip_float_extensions (expr); + tree s_intype = TREE_TYPE (s_expr); + const enum built_in_function fcode = builtin_mathfn_code (s_expr); + tree fn = 0; + + switch (fcode) + { + CASE_FLT_FN (BUILT_IN_LOGB): + fn = mathfn_built_in (s_intype, BUILT_IN_ILOGB); + break; + + default: + break; + } + + if (fn) + { + tree newexpr = build_call_expr (fn, 1, CALL_EXPR_ARG (s_expr, 0)); + return convert_to_integer (type, newexpr); + } + } + switch (TREE_CODE (intype)) { case POINTER_TYPE: |