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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
This commit is contained in:
Eric Botcazou 2018-02-09 12:33:40 +00:00 committed by Eric Botcazou
parent 0079ae8877
commit 183187053d
2 changed files with 19 additions and 3 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2018-02-09 Eric Botcazou <ebotcazou@adacore.com>
* optabs.c (prepare_cmp_insn): Try harder to emit a direct comparison
instead of a libcall for UNORDERED.
2018-02-09 Tamar Christina <tamar.christina@arm.com>
PR target/82641

17
gcc/optabs.c
View File

@ -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;