From 95ede84f4de18747d03d79c148013cff99acd60b Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Thu, 27 Jul 2017 13:26:33 -0700 Subject: [PATCH] tcg/arm: Tighten tlb indexing offset test 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 --- tcg/arm/tcg-target.inc.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/tcg/arm/tcg-target.inc.c b/tcg/arm/tcg-target.inc.c index 66c369c239..6c12b169ce 100644 --- a/tcg/arm/tcg-target.inc.c +++ b/tcg/arm/tcg-target.inc.c @@ -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. */ - 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, (24 << 7) | (cmp_off >> 8)); base = TCG_REG_R2;