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2011-07-15 Michael Hope <michael.hope@linaro.org>
gcc/
Backport from mainline:
2011-03-22 Eric Botcazou <ebotcazou@adacore.com>
* combine.c (simplify_set): Try harder to find the best CC mode when
simplifying a nested COMPARE on the RHS.
=== modified file 'gcc/combine.c'
--- old/gcc/combine.c 2011-05-27 14:31:18 +0000
+++ new/gcc/combine.c 2011-07-11 03:52:31 +0000
@@ -6287,10 +6287,18 @@
enum rtx_code new_code;
rtx op0, op1, tmp;
int other_changed = 0;
+ rtx inner_compare = NULL_RTX;
enum machine_mode compare_mode = GET_MODE (dest);
if (GET_CODE (src) == COMPARE)
- op0 = XEXP (src, 0), op1 = XEXP (src, 1);
+ {
+ op0 = XEXP (src, 0), op1 = XEXP (src, 1);
+ if (GET_CODE (op0) == COMPARE && op1 == const0_rtx)
+ {
+ inner_compare = op0;
+ op0 = XEXP (inner_compare, 0), op1 = XEXP (inner_compare, 1);
+ }
+ }
else
op0 = src, op1 = CONST0_RTX (GET_MODE (src));
@@ -6332,6 +6340,12 @@
need to use a different CC mode here. */
if (GET_MODE_CLASS (GET_MODE (op0)) == MODE_CC)
compare_mode = GET_MODE (op0);
+ else if (inner_compare
+ && GET_MODE_CLASS (GET_MODE (inner_compare)) == MODE_CC
+ && new_code == old_code
+ && op0 == XEXP (inner_compare, 0)
+ && op1 == XEXP (inner_compare, 1))
+ compare_mode = GET_MODE (inner_compare);
else
compare_mode = SELECT_CC_MODE (new_code, op0, op1);
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