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| author | Richard Henderson <rth@twiddle.net> | 2013-08-30 09:48:56 -0700 |
|---|---|---|
| committer | Richard Henderson <rth@twiddle.net> | 2013-10-01 10:20:33 -0700 |
| commit | ee06e23051251c00778edf54fb930198df0e873a (patch) | |
| tree | 3e27ed86ac618a7291f95897e4e10111c0bbeb68 /tcg/arm | |
| parent | 66c2056fb83b873df0a3a4bda3a679bf53d082a2 (diff) | |
| download | qemu-ee06e23051251c00778edf54fb930198df0e873a.zip qemu-ee06e23051251c00778edf54fb930198df0e873a.tar.gz qemu-ee06e23051251c00778edf54fb930198df0e873a.tar.bz2 | |
tcg-arm: Move the tlb addend load earlier
There are free scheduling slots between the sequence of
comparison instructions. This requires changing the
register in use to avoid conflict with those compares.
Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'tcg/arm')
| -rw-r--r-- | tcg/arm/tcg-target.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/tcg/arm/tcg-target.c b/tcg/arm/tcg-target.c index 0b09672..622cc49 100644 --- a/tcg/arm/tcg-target.c +++ b/tcg/arm/tcg-target.c @@ -1183,8 +1183,8 @@ static TCGReg tcg_out_tlb_read(TCGContext *s, TCGReg addrlo, TCGReg addrhi, * add r2, r2, r0, lsl #CPU_TLB_ENTRY_BITS (3) * ldr r0, [r2, #cmp] (4) * tst addr_reg, #s_mask - * cmpeq r0, tmp, lsl #TARGET_PAGE_BITS (5) - * ldr r1, [r2, #add] + * ldr r1, [r2, #add] (5) + * cmpeq r0, tmp, lsl #TARGET_PAGE_BITS */ tcg_out_dat_reg(s, COND_AL, ARITH_MOV, TCG_REG_TMP, 0, addrlo, SHIFT_IMM_LSR(TARGET_PAGE_BITS)); @@ -1221,6 +1221,9 @@ static TCGReg tcg_out_tlb_read(TCGContext *s, TCGReg addrlo, TCGReg addrhi, 0, addrlo, (1 << s_bits) - 1); } + /* Load the tlb addend. */ + tcg_out_ld32_12(s, COND_AL, TCG_REG_R2, TCG_REG_R2, add_off); + tcg_out_dat_reg(s, (s_bits ? COND_EQ : COND_AL), ARITH_CMP, 0, TCG_REG_R0, TCG_REG_TMP, SHIFT_IMM_LSL(TARGET_PAGE_BITS)); @@ -1229,9 +1232,7 @@ static TCGReg tcg_out_tlb_read(TCGContext *s, TCGReg addrlo, TCGReg addrhi, TCG_REG_R1, addrhi, SHIFT_IMM_LSL(0)); } - /* Load the tlb addend. */ - tcg_out_ld32_12(s, COND_AL, TCG_REG_R1, TCG_REG_R2, add_off); - return TCG_REG_R1; + return TCG_REG_R2; } /* Record the context of a call to the out of line helper code for the slow |