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Patches to fix minor optimizer bugs

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Patches to fix minor optimizer bugs
	* expmed.c (extract_bit_field): Don't make flag_force_mem disable
	extzv for memory operands.
	* cse.c (simplify_ternary_operation, case IF_THEN_ELSE): Collapse
	redundant conditional moves to single operand.

From-SVN: r16129
This commit is contained in:
Jim Wilson 1997-10-20 23:49:48 +00:00 committed by Jim Wilson
parent ded17aad24
commit 3bf1b08254
3 changed files with 20 additions and 3 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
Mon Oct 20 16:47:08 1997 Jim Wilson <wilson@cygnus.com>
* expmed.c (extract_bit_field): Don't make flag_force_mem disable
extzv for memory operands.
* cse.c (simplify_ternary_operation, case IF_THEN_ELSE): Collapse
redundant conditional moves to single operand.
Mon Oct 20 15:30:26 1997 Nick Clifton <nickc@cygnus.com>
* v850.h: Move define of __v850__ from CPP_PREDEFINES

10
gcc/cse.c
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@ -4669,6 +4669,16 @@ simplify_ternary_operation (code, mode, op0_mode, op0, op1, op2)
case IF_THEN_ELSE:
if (GET_CODE (op0) == CONST_INT)
return op0 != const0_rtx ? op1 : op2;
/* Convert a == b ? b : a to "a". */
if (GET_CODE (op0) == NE && ! side_effects_p (op0)
&& rtx_equal_p (XEXP (op0, 0), op1)
&& rtx_equal_p (XEXP (op0, 1), op2))
return op1;
else if (GET_CODE (op0) == EQ && ! side_effects_p (op0)
&& rtx_equal_p (XEXP (op0, 1), op1)
&& rtx_equal_p (XEXP (op0, 0), op2))
return op2;
break;
default:

5
gcc/expmed.c
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@ -1084,9 +1084,8 @@ extract_bit_field (str_rtx, bitsize, bitnum, unsignedp,
volatile_ok = 1;
/* Is the memory operand acceptable? */
if (flag_force_mem
|| ! ((*insn_operand_predicate[(int) CODE_FOR_extzv][1])
(xop0, GET_MODE (xop0))))
if (! ((*insn_operand_predicate[(int) CODE_FOR_extzv][1])
(xop0, GET_MODE (xop0))))
{
/* No, load into a reg and extract from there. */
enum machine_mode bestmode;