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re PR rtl-optimization/81443 (build/genrecog.o: virtual memory exhausted: Cannot allocate memory)

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PR rtl-optimization/81443
	* rtlanal.c (num_sign_bit_copies1) <SUBREG>: Do not propagate results
	from inner REGs to paradoxical SUBREGs.

From-SVN: r257724
This commit is contained in:
Eric Botcazou 2018-02-16 08:20:32 +00:00 committed by Eric Botcazou
parent 4cf55739fd
commit c9b34e397c
2 changed files with 7 additions and 1 deletions
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gcc/ChangeLog
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@ -1,3 +1,9 @@
2018-02-16 Eric Botcazou <ebotcazou@adacore.com>
PR rtl-optimization/81443
* rtlanal.c (num_sign_bit_copies1) <SUBREG>: Do not propagate results
from inner REGs to paradoxical SUBREGs.
2018-02-16 Richard Biener <rguenther@suse.de>
PR tree-optimization/84399

2
gcc/rtlanal.c
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@ -5101,7 +5101,7 @@ num_sign_bit_copies1 (const_rtx x, scalar_int_mode mode, const_rtx known_x,
if (WORD_REGISTER_OPERATIONS
&& load_extend_op (inner_mode) == SIGN_EXTEND
&& paradoxical_subreg_p (x)
&& (MEM_P (SUBREG_REG (x)) || REG_P (SUBREG_REG (x))))
&& MEM_P (SUBREG_REG (x)))
return cached_num_sign_bit_copies (SUBREG_REG (x), mode,
known_x, known_mode, known_ret);
}