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xtensa.md (adddi3): Don't clobber source operand used to detect carry.

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* config/xtensa/xtensa.md (adddi3): Don't clobber source operand used
        to detect carry.
        (subdi3): Reorder emitted instructions.

From-SVN: r64262
This commit is contained in:
Bob Wilson 2003-03-12 20:50:24 +00:00 committed by Bob Wilson
parent bfa2615fe1
commit 8d49831d20
2 changed files with 21 additions and 2 deletions
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6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2003-03-12 Bob Wilson <bob.wilson@acm.org>
* config/xtensa/xtensa.md (adddi3): Don't clobber source operand used
to detect carry.
(subdi3): Reorder emitted instructions.
2003-03-12 Andreas Jaeger <aj@suse.de>
* config/i386/netbsd64.h (TARGET_OS_CPP_BUILTINS): Remove call to

17
gcc/config/xtensa/xtensa.md
View File

@ -97,6 +97,7 @@
""
"
{
rtx srclo;
rtx dstlo = gen_lowpart (SImode, operands[0]);
rtx src1lo = gen_lowpart (SImode, operands[1]);
rtx src2lo = gen_lowpart (SImode, operands[2]);
@ -105,9 +106,21 @@
rtx src1hi = gen_highpart (SImode, operands[1]);
rtx src2hi = gen_highpart (SImode, operands[2]);
/* Either source can be used for overflow checking, as long as it's
not clobbered by the first addition. */
if (!rtx_equal_p (dstlo, src1lo))
srclo = src1lo;
else if (!rtx_equal_p (dstlo, src2lo))
srclo = src2lo;
else
{
srclo = gen_reg_rtx (SImode);
emit_move_insn (srclo, src1lo);
}
emit_insn (gen_addsi3 (dstlo, src1lo, src2lo));
emit_insn (gen_addsi3 (dsthi, src1hi, src2hi));
emit_insn (gen_adddi_carry (dsthi, dstlo, src2lo));
emit_insn (gen_adddi_carry (dsthi, dstlo, srclo));
DONE;
}")
@ -209,9 +222,9 @@
rtx src1hi = gen_highpart (SImode, operands[1]);
rtx src2hi = gen_highpart (SImode, operands[2]);
emit_insn (gen_subsi3 (dstlo, src1lo, src2lo));
emit_insn (gen_subsi3 (dsthi, src1hi, src2hi));
emit_insn (gen_subdi_carry (dsthi, src1lo, src2lo));
emit_insn (gen_subsi3 (dstlo, src1lo, src2lo));
DONE;
}")