mirrors/qemu
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

tcg/arm: Tighten tlb indexing offset test

Browse Source 
We are not going to use ldrd for loading the comparator
for 32-bit guests, so don't limit cmp_off to 8 bits then.
This eliminates one insn in the tlb load for some guests.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2017-07-27 13:26:33 -07:00
parent 647ab96aaf
commit 95ede84f4d
1 changed files with 3 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
tcg/arm/tcg-target.inc.c
View File

@ -1202,7 +1202,9 @@ static TCGReg tcg_out_tlb_read(TCGContext *s, TCGReg addrlo, TCGReg addrhi,
} }
/* We checked that the offset is contained within 16 bits above. */ /* We checked that the offset is contained within 16 bits above. */
if (add_off > 0xfff || (use_armv6_instructions && cmp_off > 0xff)) { if (add_off > 0xfff
|| (use_armv6_instructions && TARGET_LONG_BITS == 64
&& cmp_off > 0xff)) {
tcg_out_dat_imm(s, COND_AL, ARITH_ADD, TCG_REG_R2, base, tcg_out_dat_imm(s, COND_AL, ARITH_ADD, TCG_REG_R2, base,
(24 << 7) | (cmp_off >> 8)); (24 << 7) | (cmp_off >> 8));
base = TCG_REG_R2; base = TCG_REG_R2;