procyberian/gcc
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

[ARM] Allow any register for DImode values in Thumb2

Browse source 
Ramana commented in the submission email:

    I noticed that for T32 we don't allow any old register for DImode
    values. The restriction of an even register is true only for ARM state
    because the ISA doesn't allow any old register in this place. In a few
    large .i files that I had knocking about, noticed a nice drop in stack
    usage and a generally improved register allocation strategy.

From-SVN: r209615
This commit is contained in:
Ramana Radhakrishnan 2014-04-22 10:05:48 +00:00 • committed by Marcus Shawcroft
parent a01be1aeb2
commit 9d8b4d1ce9
2 changed files with 17 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
gcc/ChangeLog
View file

@ -1,3 +1,8 @@
2014-04-22 Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>
* config/arm/arm.c (arm_hard_regno_mode_ok): Loosen
restrictions on core registers for DImode values in Thumb2.
2014-04-22 Ian Bolton <ian.bolton@arm.com>
* config/arm/arm.md (*anddi_notdi_zesidi): New pattern.

17
gcc/config/arm/arm.c
View file

@ -22646,12 +22646,19 @@ arm_hard_regno_mode_ok (unsigned int regno, enum machine_mode mode)
}
/* We allow almost any value to be stored in the general registers.
Restrict doubleword quantities to even register pairs so that we can
use ldrd. Do not allow very large Neon structure opaque modes in
general registers; they would use too many. */
Restrict doubleword quantities to even register pairs in ARM state
so that we can use ldrd. Do not allow very large Neon structure
opaque modes in general registers; they would use too many. */
if (regno <= LAST_ARM_REGNUM)
return !(TARGET_LDRD && GET_MODE_SIZE (mode) > 4 && (regno & 1) != 0)
&& ARM_NUM_REGS (mode) <= 4;
{
if (ARM_NUM_REGS (mode) > 4)
return FALSE;
if (TARGET_THUMB2)
return TRUE;
return !(TARGET_LDRD && GET_MODE_SIZE (mode) > 4 && (regno & 1) != 0);
}
if (regno == FRAME_POINTER_REGNUM
|| regno == ARG_POINTER_REGNUM)