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riscv-gcc-1
Commit cbc9503d by Richard Sandiford Committed by Richard Sandiford
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simplify-rtx.c (simplify_binary_operation_1): Canonicalize truncated shift counts. 

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

From-SVN: r129072
parent ed540c0a
Showing with 14 additions and 2 deletions
gcc/ChangeLog
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
gcc/simplify-rtx.c
......@@ -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
......
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