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[Committed] PR middle-end/102031: Fix typo/mistake in simplify_truncation patch.

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My apologies again.  My patch to simplify truncations of SUBREGs in
simplify-rtx.c contained an error where I'd accidentally compared
against a mode instead of the precision of that mode.  Grr!  It even
survived regression testing on two platforms.  Fixed below, and
committed as obvious, after a full "make bootstrap" and "make -k check"
on x86_64-pc-linux-gnu with no new regressions.

2021-08-24  Roger Sayle  <roger@nextmovesoftware.com>

gcc/ChangeLog
	PR middle-end/102031
	* simplify-rtx.c (simplify_truncation): When comparing precisions
	use "subreg_prec" variable, not "subreg_mode".
This commit is contained in:
Roger Sayle 2021-08-24 22:07:41 +01:00
parent f95946afd1
commit 81e1894456
1 changed files with 2 additions and 2 deletions
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4
gcc/simplify-rtx.c
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@ -841,7 +841,7 @@ simplify_context::simplify_truncation (machine_mode mode, rtx op,
{
unsigned int int_op_prec = GET_MODE_PRECISION (int_op_mode);
unsigned int subreg_prec = GET_MODE_PRECISION (subreg_mode);
if (int_op_prec > subreg_mode)
if (int_op_prec > subreg_prec)
{
if (int_mode == subreg_mode)
return SUBREG_REG (op);
@ -851,7 +851,7 @@ simplify_context::simplify_truncation (machine_mode mode, rtx op,
}
/* Simplification of (truncate:A (subreg:B X:C 0)) where
A is narrower than B and B is narrower than C. */
else if (int_op_prec < subreg_mode
else if (int_op_prec < subreg_prec
&& GET_MODE_PRECISION (int_mode) < int_op_prec)
return simplify_gen_unary (TRUNCATE, int_mode,
SUBREG_REG (op), subreg_mode);