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cse.c (record_jump_cond_subreg): New. 

* cse.c (record_jump_cond_subreg): New.
        (record_jump_cond): Use it instead of gen_lowpart.

From-SVN: r91119
This commit is contained in:
Richard Henderson 2004-11-23 15:28:56 -08:00 committed by Richard Henderson
parent 7a32a925c5
commit 794693c02d
2 changed files with 33 additions and 20 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2004-11-23 Richard Henderson <rth@redhat.com>
* cse.c (record_jump_cond_subreg): New.
(record_jump_cond): Use it instead of gen_lowpart.
2004-11-23 Daniel Jacobowitz <dan@codesourcery.com>
Joseph Myers <joseph@codesourcery.com>

48
gcc/cse.c
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@ -4335,6 +4335,18 @@ record_jump_equiv (rtx insn, int taken)
record_jump_cond (code, mode, op0, op1, reversed_nonequality);
}
/* Yet another form of subreg creation. In this case, we want something in
MODE, and we should assume OP has MODE iff it is naturally modeless. */
static rtx
record_jump_cond_subreg (enum machine_mode mode, rtx op)
{
enum machine_mode op_mode = GET_MODE (op);
if (op_mode == mode || op_mode == VOIDmode)
return op;
return lowpart_subreg (mode, op, op_mode);
}
/* We know that comparison CODE applied to OP0 and OP1 in MODE is true.
REVERSED_NONEQUALITY is nonzero if CODE had to be swapped.
Make any useful entries we can with that information. Called from
@ -4359,11 +4371,10 @@ record_jump_cond (enum rtx_code code, enum machine_mode mode, rtx op0,
> GET_MODE_SIZE (GET_MODE (SUBREG_REG (op0)))))
{
enum machine_mode inner_mode = GET_MODE (SUBREG_REG (op0));
rtx tem = gen_lowpart (inner_mode, op1);
record_jump_cond (code, mode, SUBREG_REG (op0),
tem ? tem : gen_rtx_SUBREG (inner_mode, op1, 0),
reversed_nonequality);
rtx tem = record_jump_cond_subreg (inner_mode, op1);
if (tem)
record_jump_cond (code, mode, SUBREG_REG (op0), tem,
reversed_nonequality);
}
if (code == EQ && GET_CODE (op1) == SUBREG
@ -4371,11 +4382,10 @@ record_jump_cond (enum rtx_code code, enum machine_mode mode, rtx op0,
> GET_MODE_SIZE (GET_MODE (SUBREG_REG (op1)))))
{
enum machine_mode inner_mode = GET_MODE (SUBREG_REG (op1));
rtx tem = gen_lowpart (inner_mode, op0);
record_jump_cond (code, mode, SUBREG_REG (op1),
tem ? tem : gen_rtx_SUBREG (inner_mode, op0, 0),
reversed_nonequality);
rtx tem = record_jump_cond_subreg (inner_mode, op0);
if (tem)
record_jump_cond (code, mode, SUBREG_REG (op1), tem,
reversed_nonequality);
}
/* Similarly, if this is an NE comparison, and either is a SUBREG
@ -4391,11 +4401,10 @@ record_jump_cond (enum rtx_code code, enum machine_mode mode, rtx op0,
< GET_MODE_SIZE (GET_MODE (SUBREG_REG (op0)))))
{
enum machine_mode inner_mode = GET_MODE (SUBREG_REG (op0));
rtx tem = gen_lowpart (inner_mode, op1);
record_jump_cond (code, mode, SUBREG_REG (op0),
tem ? tem : gen_rtx_SUBREG (inner_mode, op1, 0),
reversed_nonequality);
rtx tem = record_jump_cond_subreg (inner_mode, op1);
if (tem)
record_jump_cond (code, mode, SUBREG_REG (op0), tem,
reversed_nonequality);
}
if (code == NE && GET_CODE (op1) == SUBREG
@ -4404,11 +4413,10 @@ record_jump_cond (enum rtx_code code, enum machine_mode mode, rtx op0,
< GET_MODE_SIZE (GET_MODE (SUBREG_REG (op1)))))
{
enum machine_mode inner_mode = GET_MODE (SUBREG_REG (op1));
rtx tem = gen_lowpart (inner_mode, op0);
record_jump_cond (code, mode, SUBREG_REG (op1),
tem ? tem : gen_rtx_SUBREG (inner_mode, op0, 0),
reversed_nonequality);
rtx tem = record_jump_cond_subreg (inner_mode, op0);
if (tem)
record_jump_cond (code, mode, SUBREG_REG (op1), tem,
reversed_nonequality);
}
/* Hash both operands. */