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(expand_unop): Try subtraction from zero if there isn't a

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negate library function.

From-SVN: r8485
This commit is contained in:
Doug Evans 1994-11-17 20:14:21 +00:00
parent 13d50804a0
commit b82b6eea93
1 changed files with 11 additions and 0 deletions
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11
gcc/optabs.c
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@ -2041,6 +2041,17 @@ expand_unop (mode, unoptab, op0, target, unsignedp)
}
}
/* If there is no negate operation, try doing a subtract from zero.
The US Software GOFAST library needs this. */
if (unoptab == neg_optab)
{
rtx temp;
temp = expand_binop (mode, sub_optab, CONST0_RTX (mode), op0,
target, unsignedp, OPTAB_LIB_WIDEN);
if (temp)
return temp;
}
return 0;
}