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simplify-rtx.c (simplify_binary_operation): Constant fold DIV, MOD, UDIV and UMOD using div_and_round_double.

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* simplify-rtx.c (simplify_binary_operation): Constant fold
	DIV, MOD, UDIV and UMOD using div_and_round_double.

From-SVN: r80420
This commit is contained in:
Roger Sayle 2004-04-05 03:14:13 +00:00 • committed by Roger Sayle
parent e1c6f28deb
commit 9d3172516d
2 changed files with 30 additions and 6 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2004-04-04 Roger Sayle <roger@eyesopen.com>
* simplify-rtx.c (simplify_binary_operation): Constant fold
DIV, MOD, UDIV and UMOD using div_and_round_double.
2004-04-04 Mark Mitchell <mark@codesourcery.com>
PR c++/14804

31
gcc/simplify-rtx.c
View file

@ -1285,8 +1285,8 @@ simplify_binary_operation (enum rtx_code code, enum machine_mode mode,
&& (GET_CODE (trueop1) == CONST_DOUBLE
|| GET_CODE (trueop1) == CONST_INT))
{
unsigned HOST_WIDE_INT l1, l2, lv;
HOST_WIDE_INT h1, h2, hv;
unsigned HOST_WIDE_INT l1, l2, lv, lt;
HOST_WIDE_INT h1, h2, hv, ht;
if (GET_CODE (trueop0) == CONST_DOUBLE)
l1 = CONST_DOUBLE_LOW (trueop0), h1 = CONST_DOUBLE_HIGH (trueop0);
@ -1315,10 +1315,29 @@ simplify_binary_operation (enum rtx_code code, enum machine_mode mode,
mul_double (l1, h1, l2, h2, &lv, &hv);
break;
case DIV: case MOD: case UDIV: case UMOD:
/* We'd need to include tree.h to do this and it doesn't seem worth
it. */
return 0;
case DIV:
if (div_and_round_double (TRUNC_DIV_EXPR, 0, l1, h1, l2, h2,
&lv, &hv, &lt, &ht))
return 0;
break;
case MOD:
if (div_and_round_double (TRUNC_DIV_EXPR, 0, l1, h1, l2, h2,
&lt, &ht, &lv, &hv))
return 0;
break;
case UDIV:
if (div_and_round_double (TRUNC_DIV_EXPR, 1, l1, h1, l2, h2,
&lv, &hv, &lt, &ht))
return 0;
break;
case UMOD:
if (div_and_round_double (TRUNC_DIV_EXPR, 1, l1, h1, l2, h2,
&lt, &ht, &lv, &hv))
return 0;
break;
case AND:
lv = l1 & l2, hv = h1 & h2;