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re PR rtl-optimization/87361 (gcc.target/sparc/20161111-1.c FAILs)

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PR rtl-optimization/87361
	* rtlanal.c (nonzero_bits1): Revert accidental change.

From-SVN: r264420
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Eric Botcazou 2018-09-19 10:12:04 +00:00 • committed by Eric Botcazou
parent d4eb08fe02
commit 574f5885f7
2 changed files with 8 additions and 3 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2018-09-19 Eric Botcazou <ebotcazou@adacore.com>
PR rtl-optimization/87361
* rtlanal.c (nonzero_bits1): Revert accidental change.
2018-09-19 Richard Biener <rguenther@suse.de>
PR tree-optimization/87349

6
gcc/rtlanal.c
View file

@ -4758,17 +4758,17 @@ nonzero_bits1 (const_rtx x, scalar_int_mode mode, const_rtx known_x,
nonzero &= cached_nonzero_bits (SUBREG_REG (x), mode,
known_x, known_mode, known_ret);
/* On many CISC machines, accessing an object in a wider mode
/* On many CISC machines, accessing an object in a wider mode
causes the high-order bits to become undefined. So they are
not known to be zero. */
rtx_code extend_op;
if ((!WORD_REGISTER_OPERATIONS
/* If this is a typical RISC machine, we only have to worry
about the way loads are extended. */
|| !MEM_P (SUBREG_REG (x))
|| ((extend_op = load_extend_op (inner_mode)) == SIGN_EXTEND
? val_signbit_known_set_p (inner_mode, nonzero)
: extend_op != ZERO_EXTEND))
: extend_op != ZERO_EXTEND)
|| (!MEM_P (SUBREG_REG (x)) && !REG_P (SUBREG_REG (x))))
&& xmode_width > inner_width)
nonzero
|= (GET_MODE_MASK (GET_MODE (x)) & ~GET_MODE_MASK (inner_mode));