* question of RTL Generation
@ 2004-09-05 14:35 Hsin-Hsien Wu
2004-09-05 18:06 ` Dale Johannesen
0 siblings, 1 reply; 2+ messages in thread
From: Hsin-Hsien Wu @ 2004-09-05 14:35 UTC (permalink / raw)
To: gcc
Hello,
Here is a RTL generated by gcc.
(insn 807 806 812 88 0x401639a0 (set (mem:DI (reg:SI 22 r22 [2]) [2 S8 A32])
(reg/v:DI 16 r16 [65])) 107 {*target_movdi} (nil)
(nil))
I don't want the register allocator to allocate the regs (regs >15) as a
memory index or base register.
(insn 807 806 812 88 0x401639a0 (set (mem:DI (reg:SI 22 r22 [2]) [2 S8 A32])
^____ I don't want r22 to be allocated here.
Does any one have the idea ?
Thanks
Mike Wu
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: question of RTL Generation
2004-09-05 14:35 question of RTL Generation Hsin-Hsien Wu
@ 2004-09-05 18:06 ` Dale Johannesen
0 siblings, 0 replies; 2+ messages in thread
From: Dale Johannesen @ 2004-09-05 18:06 UTC (permalink / raw)
To: Hsin-Hsien Wu; +Cc: gcc, Dale Johannesen
On Sep 5, 2004, at 7:35 AM, Hsin-Hsien Wu wrote:
> Hello,
>
> Here is a RTL generated by gcc.
> (insn 807 806 812 88 0x401639a0 (set (mem:DI (reg:SI 22 r22 [2]) [2 S8
> A32])
> (reg/v:DI 16 r16 [65])) 107 {*target_movdi} (nil)
> (nil))
>
> I don't want the register allocator to allocate the regs (regs >15) as
> a
> memory index or base register.
> (insn 807 806 812 88 0x401639a0 (set (mem:DI (reg:SI 22 r22 [2]) [2 S8
> A32])
>
> ^____ I don't want r22 to be allocated here.
>
> Does any one have the idea ?
This is done with register classes. See the BASE_REGS class ('b'
constraint)
in the powerpc port.
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2004-09-05 14:35 question of RTL Generation Hsin-Hsien Wu
2004-09-05 18:06 ` Dale Johannesen
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