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tcg/mips: Reorg tlb load within prepare_host_addr 

Compare the address vs the tlb entry with sign-extended values.
This simplifies the page+alignment mask constant, and the
generation of the last byte address for the misaligned test.

Move the tlb addend load up, and the zero-extension down.

This frees up a register, which allows us use TMP3 as the returned base
address register instead of A0, which we were using as a 5th temporary.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-04-24 04:29:40 +01:00
parent a79956219f
commit 2f2a3d1d0b
1 changed files with 18 additions and 20 deletions
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38
tcg/mips/tcg-target.c.inc
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@ -370,6 +370,8 @@ typedef enum {
ALIAS_PADDI = sizeof(void *) == 4 ? OPC_ADDIU : OPC_DADDIU,
ALIAS_TSRL = TARGET_LONG_BITS == 32 || TCG_TARGET_REG_BITS == 32
? OPC_SRL : OPC_DSRL,
ALIAS_TADDI = TARGET_LONG_BITS == 32 || TCG_TARGET_REG_BITS == 32
? OPC_ADDIU : OPC_DADDIU,
} MIPSInsn;
/*
@ -1263,14 +1265,12 @@ static TCGLabelQemuLdst *prepare_host_addr(TCGContext *s, HostAddress *h,
int add_off = offsetof(CPUTLBEntry, addend);
int cmp_off = is_ld ? offsetof(CPUTLBEntry, addr_read)
: offsetof(CPUTLBEntry, addr_write);
target_ulong tlb_mask;
ldst = new_ldst_label(s);
ldst->is_ld = is_ld;
ldst->oi = oi;
ldst->addrlo_reg = addrlo;
ldst->addrhi_reg = addrhi;
base = TCG_REG_A0;
/* Load tlb_mask[mmu_idx] and tlb_table[mmu_idx]. */
QEMU_BUILD_BUG_ON(TLB_MASK_TABLE_OFS(0) > 0);
@ -1290,15 +1290,12 @@ static TCGLabelQemuLdst *prepare_host_addr(TCGContext *s, HostAddress *h,
if (TCG_TARGET_REG_BITS < TARGET_LONG_BITS) {
tcg_out_ldst(s, OPC_LW, TCG_TMP0, TCG_TMP3, cmp_off + LO_OFF);
} else {
tcg_out_ldst(s, (TARGET_LONG_BITS == 64 ? OPC_LD
: TCG_TARGET_REG_BITS == 64 ? OPC_LWU : OPC_LW),
TCG_TMP0, TCG_TMP3, cmp_off);
tcg_out_ld(s, TCG_TYPE_TL, TCG_TMP0, TCG_TMP3, cmp_off);
}
/* Zero extend a 32-bit guest address for a 64-bit host. */
if (TCG_TARGET_REG_BITS > TARGET_LONG_BITS) {
tcg_out_ext32u(s, base, addrlo);
addrlo = base;
if (TCG_TARGET_REG_BITS >= TARGET_LONG_BITS) {
/* Load the tlb addend for the fast path. */
tcg_out_ld(s, TCG_TYPE_PTR, TCG_TMP3, TCG_TMP3, add_off);
}
/*
@ -1306,18 +1303,18 @@ static TCGLabelQemuLdst *prepare_host_addr(TCGContext *s, HostAddress *h,
* For unaligned accesses, compare against the end of the access to
* verify that it does not cross a page boundary.
*/
tlb_mask = (target_ulong)TARGET_PAGE_MASK | a_mask;
tcg_out_movi(s, TCG_TYPE_I32, TCG_TMP1, tlb_mask);
if (a_mask >= s_mask) {
tcg_out_opc_reg(s, OPC_AND, TCG_TMP1, TCG_TMP1, addrlo);
} else {
tcg_out_opc_imm(s, ALIAS_PADDI, TCG_TMP2, addrlo, s_mask - a_mask);
tcg_out_movi(s, TCG_TYPE_TL, TCG_TMP1, TARGET_PAGE_MASK | a_mask);
if (a_mask < s_mask) {
tcg_out_opc_imm(s, ALIAS_TADDI, TCG_TMP2, addrlo, s_mask - a_mask);
tcg_out_opc_reg(s, OPC_AND, TCG_TMP1, TCG_TMP1, TCG_TMP2);
} else {
tcg_out_opc_reg(s, OPC_AND, TCG_TMP1, TCG_TMP1, addrlo);
}
if (TCG_TARGET_REG_BITS >= TARGET_LONG_BITS) {
/* Load the tlb addend for the fast path. */
tcg_out_ld(s, TCG_TYPE_PTR, TCG_TMP2, TCG_TMP3, add_off);
/* Zero extend a 32-bit guest address for a 64-bit host. */
if (TCG_TARGET_REG_BITS > TARGET_LONG_BITS) {
tcg_out_ext32u(s, TCG_TMP2, addrlo);
addrlo = TCG_TMP2;
}
ldst->label_ptr[0] = s->code_ptr;
@ -1329,14 +1326,15 @@ static TCGLabelQemuLdst *prepare_host_addr(TCGContext *s, HostAddress *h,
tcg_out_ldst(s, OPC_LW, TCG_TMP0, TCG_TMP3, cmp_off + HI_OFF);
/* Load the tlb addend for the fast path. */
tcg_out_ld(s, TCG_TYPE_PTR, TCG_TMP2, TCG_TMP3, add_off);
tcg_out_ld(s, TCG_TYPE_PTR, TCG_TMP3, TCG_TMP3, add_off);
ldst->label_ptr[1] = s->code_ptr;
tcg_out_opc_br(s, OPC_BNE, addrhi, TCG_TMP0);
}
/* delay slot */
tcg_out_opc_reg(s, ALIAS_PADD, base, TCG_TMP2, addrlo);
base = TCG_TMP3;
tcg_out_opc_reg(s, ALIAS_PADD, base, TCG_TMP3, addrlo);
#else
if (a_mask && (use_mips32r6_instructions || a_bits != s_bits)) {
ldst = new_ldst_label(s);