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| author | Eric Botcazou <ebotcazou@adacore.com> | 2018-02-09 12:33:40 +0000 |
|---|---|---|
| committer | Eric Botcazou <ebotcazou@gcc.gnu.org> | 2018-02-09 12:33:40 +0000 |
| commit | 183187053d0222477cff678be5360597a57ccc6f (patch) | |
| tree | 4fd39ca0dd3cc59e95aa3cd55828e2558faf6b6d /gcc/optabs.c | |
| parent | 0079ae8877dfb4be135ac26c21819f4a094f0289 (diff) | |
| download | gcc-183187053d0222477cff678be5360597a57ccc6f.zip gcc-183187053d0222477cff678be5360597a57ccc6f.tar.gz gcc-183187053d0222477cff678be5360597a57ccc6f.tar.bz2 | |
optabs.c (prepare_cmp_insn): Try harder to emit a direct comparison instead of a libcall for UNORDERED.
* optabs.c (prepare_cmp_insn): Try harder to emit a direct comparison
instead of a libcall for UNORDERED.
From-SVN: r257525
Diffstat (limited to 'gcc/optabs.c')
| -rw-r--r-- | gcc/optabs.c | 17 |
1 files changed, 14 insertions, 3 deletions
diff --git a/gcc/optabs.c b/gcc/optabs.c index daac545..5f61e4e 100644 --- a/gcc/optabs.c +++ b/gcc/optabs.c @@ -3935,7 +3935,20 @@ prepare_cmp_insn (rtx x, rtx y, enum rtx_code comparison, rtx size, if (methods != OPTAB_LIB_WIDEN) goto fail; - if (!SCALAR_FLOAT_MODE_P (mode)) + if (SCALAR_FLOAT_MODE_P (mode)) + { + /* Small trick if UNORDERED isn't implemented by the hardware. */ + if (comparison == UNORDERED && rtx_equal_p (x, y)) + { + prepare_cmp_insn (x, y, UNLT, NULL_RTX, unsignedp, OPTAB_WIDEN, + ptest, pmode); + if (*ptest) + return; + } + + prepare_float_lib_cmp (x, y, comparison, ptest, pmode); + } + else { rtx result; machine_mode ret_mode; @@ -3982,8 +3995,6 @@ prepare_cmp_insn (rtx x, rtx y, enum rtx_code comparison, rtx size, prepare_cmp_insn (x, y, comparison, NULL_RTX, unsignedp, methods, ptest, pmode); } - else - prepare_float_lib_cmp (x, y, comparison, ptest, pmode); return; |