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riscv locore.S: load constant prior to loop

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A very minor micro-optimization; t0 is not clobbered between the loop top and
bottom and there appear to be no other branches to this label.

Submitted by:	Nathaniel Filardo <nwf20@cl.cam.ac.uk>
Reviewed by:	mhorne
Differential Revision:	https://reviews.freebsd.org/D25524
This commit is contained in:
Kristof Provost 2020-07-01 19:12:47 +00:00
parent d53a2816c7
commit 6f11e59d72
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=362852
1 changed files with 1 additions and 1 deletions
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2
sys/riscv/riscv/locore.S
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@ -139,8 +139,8 @@ pagetables:
li t2, 512 /* Build 512 entries */
add t3, t4, t2
li t5, 0
1:
li t0, (PTE_KERN | PTE_X)
1:
slli t2, t4, PTE_PPN1_S /* << PTE_PPN1_S */
or t5, t0, t2
sd t5, (s1) /* Store PTE entry to position */