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i386.md (neghi2): Do not output prefixed opcode when possible. 

* i386.md (neghi2): Do not output prefixed opcode when possible.
	(ashlhi3): Likewise.

From-SVN: r26433
This commit is contained in:
Jan Hubicka 1999-04-14 01:39:22 +02:00 committed by Jeff Law
parent fb693d4449
commit c0b9be6798
2 changed files with 33 additions and 3 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
Wed Apr 14 00:18:22 1999 Jan Hubicka <hubicka@freesoft.cz>
* i386.md (neghi2): Do not output prefixed opcode when possible.
(ashlhi3): Likewise.
Wed Apr 14 00:08:46 1999 Richard Henderson <rth@cygnus.com>
* i386.c (memory_address_length): New function.

31
gcc/config/i386/i386.md
View File

@ -4721,7 +4721,13 @@ byte_xor_operation:
[(set (match_operand:HI 0 "nonimmediate_operand" "=rm")
(neg:HI (match_operand:HI 1 "nonimmediate_operand" "0")))]
""
"neg%W0 %0")
"*
if (REG_P (operands[0]) && i386_cc_probably_useless_p (insn))
{
CC_STATUS_INIT;
return AS1(neg%L0,%0);
}
return AS1(neg%W0,%0);")
(define_insn "negqi2"
[(set (match_operand:QI 0 "nonimmediate_operand" "=qm")
@ -5053,11 +5059,30 @@ byte_xor_operation:
"*
{
if (REG_P (operands[2]))
return AS2 (sal%W0,%b2,%0);
{
if (REG_P (operands[0]) && i386_cc_probably_useless_p (insn))
{
CC_STATUS_INIT;
return AS2 (sal%L0,%b2,%k0);
}
return AS2 (sal%W0,%b2,%0);
}
if (REG_P (operands[0]) && operands[2] == const1_rtx)
return AS2 (add%W0,%0,%0);
{
if (i386_cc_probably_useless_p (insn))
{
CC_STATUS_INIT;
return AS2 (add%L0,%k0,%k0);
}
return AS2 (add%W0,%0,%0);
}
if (REG_P (operands[0]) && i386_cc_probably_useless_p (insn))
{
CC_STATUS_INIT;
return AS2 (sal%L0,%2,%k0);
}
return AS2 (sal%W0,%2,%0);
}")