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optabs.c (expand_binop): Correctly handle the carry in multiword add/subtract operations. 

* optabs.c (expand_binop): Correctly handle the carry in multiword
	add/subtract operations.

From-SVN: r45210
This commit is contained in:
Geoffrey Keating 2001-08-27 20:35:37 +00:00 committed by Geoffrey Keating
parent b7a0c86f58
commit 859cb4d84e
2 changed files with 16 additions and 13 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2001-08-27 Geoffrey Keating <geoffk@redhat.com>
* optabs.c (expand_binop): Correctly handle the carry in multiword
add/subtract operations.
2001-08-27 Fred Fish <fnf@be.com>
* ginclude/stddef.h: Fix typo, __SIZE__TYPE__ should be

24
gcc/optabs.c
View File

@ -1185,7 +1185,6 @@ expand_binop (mode, binoptab, op0, op1, target, unsignedp, methods)
&& binoptab->handlers[(int) word_mode].insn_code != CODE_FOR_nothing)
{
unsigned int i;
rtx carry_tmp = gen_reg_rtx (word_mode);
optab otheroptab = binoptab == add_optab ? sub_optab : add_optab;
unsigned int nwords = GET_MODE_BITSIZE (mode) / BITS_PER_WORD;
rtx carry_in = NULL_RTX, carry_out = NULL_RTX;
@ -1241,24 +1240,22 @@ expand_binop (mode, binoptab, op0, op1, target, unsignedp, methods)
if (i > 0)
{
rtx newx;
/* Add/subtract previous carry to main result. */
x = expand_binop (word_mode,
normalizep == 1 ? binoptab : otheroptab,
x, carry_in,
target_piece, 1, next_methods);
if (x == 0)
break;
else if (target_piece != x)
emit_move_insn (target_piece, x);
newx = expand_binop (word_mode,
normalizep == 1 ? binoptab : otheroptab,
x, carry_in,
NULL_RTX, 1, next_methods);
if (i + 1 < nwords)
{
/* THIS CODE HAS NOT BEEN TESTED. */
/* Get out carry from adding/subtracting carry in. */
rtx carry_tmp = gen_reg_rtx (word_mode);
carry_tmp = emit_store_flag_force (carry_tmp,
binoptab == add_optab
? LT : GT,
x, carry_in,
(binoptab == add_optab
? LT : GT),
newx, x,
word_mode, 1, normalizep);
/* Logical-ior the two poss. carry together. */
@ -1268,6 +1265,7 @@ expand_binop (mode, binoptab, op0, op1, target, unsignedp, methods)
if (carry_out == 0)
break;
}
emit_move_insn (target_piece, newx);
}
carry_in = carry_out;