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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/jump.c | |
| parent | 145d3bf292a6cfc66a6396285003765db9424a8f (diff) | |
| download | gcc-71925bc04f24a40ab8ac587e08609cf91299e293.tar.gz | |
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/jump.c')
| -rw-r--r-- | gcc/jump.c | 14 |
1 files changed, 3 insertions, 11 deletions
diff --git a/gcc/jump.c b/gcc/jump.c index 7d01a55f3ba..86b3a942769 100644 --- a/gcc/jump.c +++ b/gcc/jump.c @@ -704,11 +704,6 @@ reversed_comparison_code_parts (code, arg0, arg1, insn) break; } - /* In case we give up IEEE compatibility, all comparisons are reversible. */ - if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT - || flag_unsafe_math_optimizations) - return reverse_condition (code); - if (GET_MODE_CLASS (mode) == MODE_CC #ifdef HAVE_cc0 || arg0 == cc0_rtx @@ -757,11 +752,12 @@ reversed_comparison_code_parts (code, arg0, arg1, insn) } } - /* An integer condition. */ + /* Test for an integer condition, or a floating-point comparison + in which NaNs can be ignored. */ if (GET_CODE (arg0) == CONST_INT || (GET_MODE (arg0) != VOIDmode && GET_MODE_CLASS (mode) != MODE_CC - && ! FLOAT_MODE_P (mode))) + && !HONOR_NANS (mode))) return reverse_condition (code); return UNKNOWN; @@ -840,10 +836,6 @@ enum rtx_code reverse_condition_maybe_unordered (code) enum rtx_code code; { - /* Non-IEEE formats don't have unordered conditions. */ - if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT) - return reverse_condition (code); - switch (code) { case EQ: |