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simplify-rtx.c (simplify_binary_operation_1): Canonicalize truncated shift counts.

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gcc/
	* simplify-rtx.c (simplify_binary_operation_1): Canonicalize
	truncated shift counts.

From-SVN: r129072
This commit is contained in:
Richard Sandiford 2007-10-07 18:40:02 +00:00 committed by Richard Sandiford
parent ed540c0ab9
commit cbc9503d78
2 changed files with 14 additions and 2 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2007-10-07 Richard Sandiford <rsandifo@nildram.co.uk>
* simplify-rtx.c (simplify_binary_operation_1): Canonicalize
truncated shift counts.
2007-10-07 Kazu Hirata <kazu@codesourcery.com>
* config/m68k/m68k.c, config/m68k/m68k.md: Use the assembly

11
gcc/simplify-rtx.c
View File

@ -2562,6 +2562,13 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
&& (unsigned HOST_WIDE_INT) INTVAL (trueop0) == GET_MODE_MASK (mode)
&& ! side_effects_p (op1))
return op0;
canonicalize_shift:
if (SHIFT_COUNT_TRUNCATED && GET_CODE (op1) == CONST_INT)
{
val = INTVAL (op1) & (GET_MODE_BITSIZE (mode) - 1);
if (val != INTVAL (op1))
return simplify_gen_binary (code, mode, op0, GEN_INT (val));
}
break;
case ASHIFT:
@ -2571,7 +2578,7 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
return op0;
if (trueop0 == CONST0_RTX (mode) && ! side_effects_p (op1))
return op0;
break;
goto canonicalize_shift;
case LSHIFTRT:
if (trueop1 == CONST0_RTX (mode))
@ -2593,7 +2600,7 @@ simplify_binary_operation_1 (enum rtx_code code, enum machine_mode mode,
return simplify_gen_relational (EQ, mode, imode,
XEXP (op0, 0), const0_rtx);
}
break;
goto canonicalize_shift;
case SMIN:
if (width <= HOST_BITS_PER_WIDE_INT