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(expand_divmod): Don't make REG_NOTE if last insn's destination isn't

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QUOTIENT.

From-SVN: r7798
This commit is contained in:
Richard Kenner 1994-07-27 14:06:24 -04:00
parent ad2e7dd004
commit 4e430df869
1 changed files with 24 additions and 18 deletions
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42
gcc/expmed.c
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@ -2568,7 +2568,7 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp)
rtx quotient = 0, remainder = 0; rtx quotient = 0, remainder = 0;
rtx last; rtx last;
int size; int size;
rtx insn; rtx insn, set;
optab optab1, optab2; optab optab1, optab2;
int op1_is_constant, op1_is_pow2; int op1_is_constant, op1_is_pow2;
@ -2813,10 +2813,13 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp)
} }
insn = get_last_insn (); insn = get_last_insn ();
REG_NOTES (insn) if (insn != last
= gen_rtx (EXPR_LIST, REG_EQUAL, && (set = single_set (insn)) != 0
gen_rtx (UDIV, compute_mode, op0, op1), && SET_DEST (set) == quotient)
REG_NOTES (insn)); REG_NOTES (insn)
= gen_rtx (EXPR_LIST, REG_EQUAL,
gen_rtx (UDIV, compute_mode, op0, op1),
REG_NOTES (insn));
} }
else /* TRUNC_DIV, signed */ else /* TRUNC_DIV, signed */
{ {
@ -2878,11 +2881,14 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp)
if (d < 0) if (d < 0)
{ {
insn = get_last_insn (); insn = get_last_insn ();
REG_NOTES (insn) if (insn != last
= gen_rtx (EXPR_LIST, REG_EQUAL, && (set = single_set (insn)) != 0
gen_rtx (DIV, compute_mode, op0, && SET_DEST (set) == quotient)
GEN_INT (abs_d)), REG_NOTES (insn)
REG_NOTES (insn)); = gen_rtx (EXPR_LIST, REG_EQUAL,
gen_rtx (DIV, compute_mode, op0,
GEN_INT (abs_d)),
REG_NOTES (insn));
quotient = expand_unop (compute_mode, neg_optab, quotient = expand_unop (compute_mode, neg_optab,
quotient, quotient, 0); quotient, quotient, 0);
@ -2935,14 +2941,14 @@ expand_divmod (rem_flag, code, mode, op0, op1, target, unsignedp)
} }
} }
if (quotient != 0) insn = get_last_insn ();
{ if (insn != last
insn = get_last_insn (); && (set = single_set (insn)) != 0
REG_NOTES (insn) && SET_DEST (set) == quotient)
= gen_rtx (EXPR_LIST, REG_EQUAL, REG_NOTES (insn)
gen_rtx (DIV, compute_mode, op0, op1), = gen_rtx (EXPR_LIST, REG_EQUAL,
REG_NOTES (insn)); gen_rtx (DIV, compute_mode, op0, op1),
} REG_NOTES (insn));
} }
break; break;
} }