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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/flags.h | |
| 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/flags.h')
| -rw-r--r-- | gcc/flags.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/gcc/flags.h b/gcc/flags.h index 2c69497..3b0ee2f 100644 --- a/gcc/flags.h +++ b/gcc/flags.h @@ -633,4 +633,27 @@ extern int flag_non_call_exceptions; /* Nonzero means put zero initialized data in the bss section. */ extern int flag_zero_initialized_in_bss; +/* True if the given mode has a NaN representation and the treatment of + NaN operands is important. Certain optimizations, such as folding + x * 0 into x, are not correct for NaN operands, and are normally + disabled for modes with NaNs. The user can ask for them to be + done anyway using the -funsafe-math-optimizations switch. */ +#define HONOR_NANS(MODE) \ + (MODE_HAS_NANS (MODE) && !flag_unsafe_math_optimizations) + +/* As for HONOR_NANS, but true if the mode can represent infinity and + the treatment of infinite values is important. */ +#define HONOR_INFINITIES(MODE) \ + (MODE_HAS_INFINITIES (MODE) && !flag_unsafe_math_optimizations) + +/* Like HONOR_NANS, but true if the given mode distinguishes between + postive and negative zero, and the sign of zero is important. */ +#define HONOR_SIGNED_ZEROS(MODE) \ + (MODE_HAS_SIGNED_ZEROS (MODE) && !flag_unsafe_math_optimizations) + +/* Like HONOR_NANS, but true if given mode supports sign-dependent rounding, + and the rounding mode is important. */ +#define HONOR_SIGN_DEPENDENT_ROUNDING(MODE) \ + (MODE_HAS_SIGN_DEPENDENT_ROUNDING (MODE) && !flag_unsafe_math_optimizations) + #endif /* ! GCC_FLAGS_H */ |