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

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

From-SVN: r256998
This commit is contained in:
Eric Botcazou 2018-01-23 20:54:32 +00:00 committed by Eric Botcazou
parent 2ea7b3f38a
commit 2a1709a3ba
2 changed files with 7 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2018-01-23 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.
2018-01-21 Bill Schmidt <wschmidt@linux.vnet.ibm.com>
Backport from mainline

2
gcc/rtlanal.c
View File

@ -4976,7 +4976,7 @@ num_sign_bit_copies1 (const_rtx x, machine_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);
break;