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re PR rtl-optimization/66706 (Redundant bitmask instruction on x >> (n & 32)) 

PR rtl-optimization/66706
	* combine.c (make_compound_operation): If an AND of SUBREG of
	LSHIFTRT does not simplify, see if just the AND of SUBREG does.

From-SVN: r225344
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Segher Boessenkool 2015-07-02 18:27:11 +02:00 committed by Segher Boessenkool
parent 54e378516d
commit e62bb796ef
2 changed files with 15 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2015-07-02 Segher Boessenkool <segher@kernel.crashing.org>
PR rtl-optimization/66706
* combine.c (make_compound_operation): If an AND of SUBREG of
LSHIFTRT does not simplify, see if just the AND of SUBREG does.
2015-07-02 Alan Lawrence <alan.lawrence@arm.com>
* tree-pass.h (make_pass_ch_vect): New.

9
gcc/combine.c
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@ -7893,6 +7893,15 @@ make_compound_operation (rtx x, enum rtx_code in_code)
new_rtx = make_extraction (GET_MODE (SUBREG_REG (XEXP (x, 0))), new_rtx, 0,
XEXP (SUBREG_REG (XEXP (x, 0)), 1), i, 1,
0, in_code == COMPARE);
/* If that didn't give anything, see if the AND simplifies on
its own. */
if (!new_rtx && i >= 0)
{
new_rtx = make_compound_operation (XEXP (x, 0), next_code);
new_rtx = make_extraction (mode, new_rtx, 0, NULL_RTX, i, 1,
0, in_code == COMPARE);
}
}
/* Same as previous, but for (xor/ior (lshiftrt...) (lshiftrt...)). */
else if ((GET_CODE (XEXP (x, 0)) == XOR