MatCat.OpenSource/8sa1-gcc
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

(record_jump_cond): Use mode of op0 or op1, not MODE,

Browse Source 
when testing for narrowing or widening subregs.

From-SVN: r4301
This commit is contained in:
Richard Stallman 1993-05-02 12:43:15 +00:00
parent 64685ffacf
commit 2e794ee866
1 changed files with 13 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
gcc/cse.c
View File

@ -5490,8 +5490,10 @@ record_jump_cond (code, mode, op0, op1, reversed_nonequality)
true for all smaller modes whether or not there is a SUBREG, but
is not worth testing for with no SUBREG. */
/* Note that GET_MODE (op0) may not equal MODE. */
if (code == EQ && GET_CODE (op0) == SUBREG
&& GET_MODE_SIZE (mode) > GET_MODE_SIZE (GET_MODE (SUBREG_REG (op0))))
&& (GET_MODE_SIZE (GET_MODE (op0))
> GET_MODE_SIZE (GET_MODE (SUBREG_REG (op0)))))
{
enum machine_mode inner_mode = GET_MODE (SUBREG_REG (op0));
rtx tem = gen_lowpart_if_possible (inner_mode, op1);
@ -5502,7 +5504,8 @@ record_jump_cond (code, mode, op0, op1, reversed_nonequality)
}
if (code == EQ && GET_CODE (op1) == SUBREG
&& GET_MODE_SIZE (mode) > GET_MODE_SIZE (GET_MODE (SUBREG_REG (op1))))
&& (GET_MODE_SIZE (GET_MODE (op1))
> GET_MODE_SIZE (GET_MODE (SUBREG_REG (op1)))))
{
enum machine_mode inner_mode = GET_MODE (SUBREG_REG (op1));
rtx tem = gen_lowpart_if_possible (inner_mode, op0);
@ -5515,9 +5518,14 @@ record_jump_cond (code, mode, op0, op1, reversed_nonequality)
/* Similarly, if this is an NE comparison, and either is a SUBREG
making a smaller mode, we know the whole thing is also NE. */
/* Note that GET_MODE (op0) may not equal MODE;
if we test MODE instead, we can get an infinite recursion
alternating between two modes each wider than MODE. */
if (code == NE && GET_CODE (op0) == SUBREG
&& subreg_lowpart_p (op0)
&& GET_MODE_SIZE (mode) < GET_MODE_SIZE (GET_MODE (SUBREG_REG (op0))))
&& (GET_MODE_SIZE (GET_MODE (op0))
< GET_MODE_SIZE (GET_MODE (SUBREG_REG (op0)))))
{
enum machine_mode inner_mode = GET_MODE (SUBREG_REG (op0));
rtx tem = gen_lowpart_if_possible (inner_mode, op1);
@ -5529,7 +5537,8 @@ record_jump_cond (code, mode, op0, op1, reversed_nonequality)
if (code == NE && GET_CODE (op1) == SUBREG
&& subreg_lowpart_p (op1)
&& GET_MODE_SIZE (mode) < GET_MODE_SIZE (GET_MODE (SUBREG_REG (op1))))
&& (GET_MODE_SIZE (GET_MODE (op1))
< GET_MODE_SIZE (GET_MODE (SUBREG_REG (op1)))))
{
enum machine_mode inner_mode = GET_MODE (SUBREG_REG (op1));
rtx tem = gen_lowpart_if_possible (inner_mode, op0);