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(tstdi): Rewrite.

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From-SVN: r9913
This commit is contained in:
Richard Kenner 1995-06-09 17:48:51 -04:00
parent 7a208c0b67
commit 17856c497f
1 changed files with 16 additions and 21 deletions
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37
gcc/config/m68k/m68k.md
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@ -281,31 +281,26 @@
;; (set (cc0) (const_int foo)) has no mode information. Such insns will
;; be folded while optimizing anyway.
(define_insn "tstdi"
(define_expand "tstdi"
[(parallel
[(set (cc0)
(match_operand:DI 0 "nonimmediate_operand" "d"))
(clobber (match_dup 1))])]
""
"
{
operands[1] = gen_reg_rtx (DImode);
}")
(define_insn ""
[(set (cc0)
(match_operand:DI 0 "nonimmediate_operand" "oa>,d"))
(clobber (match_scratch:SI 1 "=d,d"))
(clobber (match_scratch:SI 2 "=d,"))]
(match_operand:DI 1 "nonimmediate_operand" "0"))
(clobber (match_operand:DI 0 "register_operand" "=d"))]
""
"*
{
if (GET_CODE (operands[0]) == REG)
operands[3] = gen_rtx (REG, SImode, REGNO (operands[0]) + 1);
else if (GET_CODE (operands[0]) == MEM
&& GET_CODE (XEXP (operands[0], 0)) == POST_INC)
operands[3] = operands[0];
else
operands[3] = adj_offsettable_operand (operands[0], 4);
if (DATA_REG_P (operands[0]))
operands[2] = operands[0];
else
output_asm_insn (\"move%.l %0,%2\", operands);
/*
** 'sub' clears %1, and also clears the X cc bit
** 'tst' sets the Z cc bit according to the low part of the DImode operand
** 'subx %1' (i.e. subx #0) acts as a (non-existent) tstx on the high part
*/
return \"sub%.l %1,%1\;tst%.l %3\;subx%.l %1,%2\";
cc_status.flags |= CC_REVERSED;
return \"neg%.l %R0\;negx%.l %0\";
}")
(define_insn "tstsi"