It is mentioned as move some instructions to make bundle compact.
I understand. Seems reasonable.
On Thu, Mar 27, 2008 at 02:40:52PM +0900, Isaku Yamahata wrote:
> On Thu, Mar 27, 2008 at 12:20:37PM +0800, Dong, Eddie wrote:
>
> > > - shuffle instructions of XEN_BSW_1 and xen DO_XEN_MIN().
> > > Is this for producing better bundles? Please ellaborate on this.
> > > If so, I'll take as another patch.
> >
> > ??? Which code are u talking for?
>
> The following hunks. The instruction order was changed.
> What's the purpose?
>
> diff --git a/include/asm-ia64/xen/inst.h b/include/asm-ia64/xen/inst.h
> index a8fb2ac..1e92d02 100644
> --- a/include/asm-ia64/xen/inst.h
> +++ b/include/asm-ia64/xen/inst.h
> @@ -414,10 +414,10 @@
> movl r30 = XSI_B1NAT; \
> ;; \
> ld8 r30 = [r30]; \
> + mov r31 = 1; \
> ;; \
> mov ar.unat = r30; \
> movl r30 = XSI_BANKNUM; \
> - mov r31 = 1; \
> ;; \
> st4 [r30] = r31; \
> movl r30 = XSI_BANK1_R16; \
> diff --git a/include/asm-ia64/xen/minstate.h b/include/asm-ia64/xen/minstate.h
> index 67bbf79..7cdebc2 100644
> --- a/include/asm-ia64/xen/minstate.h
> +++ b/include/asm-ia64/xen/minstate.h
> @@ -25,17 +25,16 @@
> * Note that psr.ic is NOT turned on by this macro. This is so that
> * we can pass interruption state as arguments to a handler.
> */
> -#define DO_SAVE_MIN(__COVER,SAVE_IFS,EXTRA)
> \
> +#define DO_SAVE_MIN(COVER,SAVE_IFS,EXTRA)
> \
> mov r16=IA64_KR(CURRENT); /* M */
> \
> mov r27=ar.rsc; /* M */
> \
> mov r20=r1; /* A */
> \
> mov r25=ar.unat; /* M */
> \
> MOV_FROM_IPSR(r29); /* M */
> \
> - mov r26=ar.pfs; /* I */
> \
> MOV_FROM_IIP(r28); /* M */
> \
> mov r21=ar.fpsr; /* M */
> \
> - __COVER; /* B;; (or nothing) */
> \
> - ;;
> \
> + mov r26=ar.pfs; /* I */
> \
> + COVER; /* B;; (or nothing) */
> \
> adds r16=IA64_TASK_THREAD_ON_USTACK_OFFSET,r16;
> \
> ;;
> \
> ld1 r17=[r16]; /* load
> current->thread.on_ustack flag */ \
> @@ -80,17 +79,17 @@
> .mem.offset 8,0; st8.spill [r17]=r9,16;
> \
> ;;
> \
> .mem.offset 0,0; st8.spill [r16]=r10,24;
> \
> + movl r8=XSI_PRECOVER_IFS;
> \
> .mem.offset 8,0; st8.spill [r17]=r11,24;
> \
> ;;
> \
> /* xen special handling for possibly lazy cover */
> \
> /* XXX: SAVE_MIN case in dispatch_ia32_handler: mov r30=r0 */
> \
> - movl r8=XSI_PRECOVER_IFS;
> \
> ;;
> \
> ld8 r30=[r8];
> \
> - ;;
> \
> +(pUStk) sub r18=r18,r22; /* r18=RSE.ndirty*8 */
> \
> st8 [r16]=r28,16; /* save cr.iip */
> \
> + ;; \
> st8 [r17]=r30,16; /* save cr.ifs */
> \
> -(pUStk) sub r18=r18,r22; /* r18=RSE.ndirty*8 */
> \
> mov r8=ar.ccv;
> \
> mov r9=ar.csd;
> \
> mov r10=ar.ssd;
> \
> @@ -131,7 +130,5 @@
> adds r2=IA64_PT_REGS_R16_OFFSET,r1;
> \
> ;;
> \
> movl r1=__gp; /* establish kernel global pointer */
> \
> - ;;
> \
> - /*bsw.1;*/ /* switch back to bank 1 (must be last in insn
> group) */ \
> ;;
> #endif /* __IA64_ASM_PARAVIRTUALIZED_XEN */
>
>
--
yamahata
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