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re PR rtl-optimization/18942 (Do loop is not as optimized as 3.3.2) 

PR rtl-optimization/18942
	* simplify-rtx.c (simplify_relational_operation_1): Simplify
	x + cst1 == cst2 to x == cst2 - cst1.  Made static.

From-SVN: r92429
This commit is contained in:
Zdenek Dvorak 2004-12-20 21:48:53 +01:00 committed by Zdenek Dvorak
parent b482789cca
commit bc4ad38cc7
2 changed files with 24 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2004-12-20 Zdenek Dvorak <dvorakz@suse.cz>
PR rtl-optimization/18942
* simplify-rtx.c (simplify_relational_operation_1): Simplify
x + cst1 == cst2 to x == cst2 - cst1. Made static.
2004-12-20 Matt Austern <austern@apple.com>
PR c++/19044

19
gcc/simplify-rtx.c
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@ -2773,10 +2773,13 @@ simplify_relational_operation (enum rtx_code code, enum machine_mode mode,
MODE is the mode of the result, while CMP_MODE specifies in which
mode the comparison is done in, so it is the mode of the operands. */
rtx
static rtx
simplify_relational_operation_1 (enum rtx_code code, enum machine_mode mode,
enum machine_mode cmp_mode, rtx op0, rtx op1)
{
enum rtx_code op0code = GET_CODE (op0);
if (GET_CODE (op1) == CONST_INT)
{
if (INTVAL (op1) == 0 && COMPARISON_P (op0))
@ -2800,6 +2803,20 @@ simplify_relational_operation_1 (enum rtx_code code, enum machine_mode mode,
}
}
/* (eq/ne (plus x cst1) cst2) simplifies to (eq/ne x (cst2 - cst1)) */
if ((code == EQ || code == NE)
&& (op0code == PLUS || op0code == MINUS)
&& CONSTANT_P (op1)
&& CONSTANT_P (XEXP (op0, 1)))
{
rtx x = XEXP (op0, 0);
rtx c = XEXP (op0, 1);
c = simplify_gen_binary (op0code == PLUS ? MINUS : PLUS,
cmp_mode, op1, c);
return simplify_gen_relational (code, mode, cmp_mode, x, c);
}
return NULL_RTX;
}