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| author | Richard Sandiford <rsandifo@redhat.com> | 2002-03-07 11:37:16 +0000 |
|---|---|---|
| committer | Richard Sandiford <rsandifo@gcc.gnu.org> | 2002-03-07 11:37:16 +0000 |
| commit | 71925bc04f24a40ab8ac587e08609cf91299e293 (patch) | |
| tree | 74f74ccd7ea753279bc20a10577c6a90a6a4ba38 /gcc/ifcvt.c | |
| parent | 145d3bf292a6cfc66a6396285003765db9424a8f (diff) | |
| download | gcc-71925bc04f24a40ab8ac587e08609cf91299e293.zip gcc-71925bc04f24a40ab8ac587e08609cf91299e293.tar.gz gcc-71925bc04f24a40ab8ac587e08609cf91299e293.tar.bz2 | |
defaults.h (MODE_HAS_NANS, [...]): New.
* defaults.h (MODE_HAS_NANS, MODE_HAS_INFINITIES): New.
(MODE_HAS_SIGNED_ZEROS, MODE_HAS_SIGN_DEPENDENT_ROUNDING): New.
* flags.h (HONOR_NANS, HONOR_INFINITIES, HONOR_SIGNED_ZEROS): New.
(HONOR_SIGN_DEPENDENT_ROUNDING): New.
* builtins.c (expand_builtin_mathfn): Use HONOR_NANS.
* c-common.c (truthvalue_conversion): Reduce x - y != 0 to x != y
unless x and y could be infinite.
(expand_unordered_cmp): New, mostly split from expand_tree_builtin.
Check that the common type of both arguments is a real, even for
targets without unordered comparisons. Allow an integer argument
to be compared against a real.
(expand_tree_builtin): Use expand_unordered_cmp.
* combine.c (combine_simplify_rtx): Use the new HONOR_... macros.
* cse.c (fold_rtx): Likewise. Fix indentation.
* fold-const.c (fold_real_zero_addition_p): New.
(fold): Use it, and the new HONOR_... macros.
* ifcvt.c (noce_try_minmax): Use the new HONOR_... macros.
* jump.c (reversed_comparison_code_parts): After searching for
the true comparison mode, use HONOR_NANS to decide whether it
can be safely reversed.
(reverse_condition_maybe_unordered): Remove IEEE check.
* simplify-rtx.c (simplify_binary_operation): Use the new macros
to decide which simplifications are valid. Allow the following
simplifications for IEEE: (-a + b) to (b - a), (a + -b) to (a - b),
and (a - -b) to (a + b).
(simplify_relational_operation): Use HONOR_NANS.
* doc/tm.texi: Document the MODE_HAS_... macros.
From-SVN: r50401
Diffstat (limited to 'gcc/ifcvt.c')
| -rw-r--r-- | gcc/ifcvt.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/gcc/ifcvt.c b/gcc/ifcvt.c index 038b8c5..7a450bc9 100644 --- a/gcc/ifcvt.c +++ b/gcc/ifcvt.c @@ -1295,12 +1295,11 @@ noce_try_minmax (if_info) if (no_new_pseudos) return FALSE; - /* ??? Reject FP modes since we don't know how 0 vs -0 or NaNs - will be resolved with an SMIN/SMAX. It wouldn't be too hard + /* ??? Reject modes with NaNs or signed zeros since we don't know how + they will be resolved with an SMIN/SMAX. It wouldn't be too hard to get the target to tell us... */ - if (FLOAT_MODE_P (GET_MODE (if_info->x)) - && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT - && ! flag_unsafe_math_optimizations) + if (HONOR_SIGNED_ZEROS (GET_MODE (if_info->x)) + || HONOR_NANS (GET_MODE (if_info->x))) return FALSE; cond = noce_get_alt_condition (if_info, if_info->a, &earliest); |