openkylin
/
qemu
mirror of https://gitee.com/openkylin/qemu.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

tcg-s390: Remove constraint letters for and 

Since we have a free temporary and can always just load the constant, we
ought to do so, rather than spending the same effort constraining the const.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2013-03-27 11:47:54 -04:00
parent d5690ea433
commit 07ff798313
1 changed files with 33 additions and 118 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

151
tcg/s390/tcg-target.c
View File

@ -38,7 +38,6 @@
#define TCG_CT_CONST_NEG 0x0200
#define TCG_CT_CONST_ADDI 0x0400
#define TCG_CT_CONST_MULI 0x0800
#define TCG_CT_CONST_ANDI 0x1000
#define TCG_CT_CONST_ORI 0x2000
#define TCG_CT_CONST_XORI 0x4000
#define TCG_CT_CONST_CMPI 0x8000
@ -417,9 +416,6 @@ static int target_parse_constraint(TCGArgConstraint *ct, const char **pct_str)
case 'K':
ct->ct |= TCG_CT_CONST_MULI;
break;
case 'A':
ct->ct |= TCG_CT_CONST_ANDI;
break;
case 'O':
ct->ct |= TCG_CT_CONST_ORI;
break;
@ -438,63 +434,6 @@ static int target_parse_constraint(TCGArgConstraint *ct, const char **pct_str)
return 0;
}
/* Immediates to be used with logical AND. This is an optimization only,
since a full 64-bit immediate AND can always be performed with 4 sequential
NI[LH][LH] instructions. What we're looking for is immediates that we
can load efficiently, and the immediate load plus the reg-reg AND is
smaller than the sequential NI's. */
static int tcg_match_andi(int ct, tcg_target_ulong val)
{
int i;
if (facilities & FACILITY_EXT_IMM) {
if (ct & TCG_CT_CONST_32) {
/* All 32-bit ANDs can be performed with 1 48-bit insn. */
return 1;
}
/* Zero-extensions. */
if (val == 0xff || val == 0xffff || val == 0xffffffff) {
return 1;
}
} else {
if (ct & TCG_CT_CONST_32) {
val = (uint32_t)val;
} else if (val == 0xffffffff) {
return 1;
}
}
/* Try all 32-bit insns that can perform it in one go. */
for (i = 0; i < 4; i++) {
tcg_target_ulong mask = ~(0xffffull << i*16);
if ((val & mask) == mask) {
return 1;
}
}
/* Look for 16-bit values performing the mask. These are better
to load with LLI[LH][LH]. */
for (i = 0; i < 4; i++) {
tcg_target_ulong mask = 0xffffull << i*16;
if ((val & mask) == val) {
return 0;
}
}
/* Look for 32-bit values performing the 64-bit mask. These
are better to load with LLI[LH]F, or if extended immediates
not available, with a pair of LLI insns. */
if ((ct & TCG_CT_CONST_32) == 0) {
if (val <= 0xffffffff || (val & 0xffffffff) == 0) {
return 0;
}
}
return 1;
}
/* Immediates to be used with logical OR. This is an optimization only,
since a full 64-bit immediate OR can always be performed with 4 sequential
OI[LH][LH] instructions. What we're looking for is immediates that we
@ -617,8 +556,6 @@ static int tcg_target_const_match(tcg_target_long val,
} else {
return val == (int16_t)val;
}
} else if (ct & TCG_CT_CONST_ANDI) {
return tcg_match_andi(ct, val);
} else if (ct & TCG_CT_CONST_ORI) {
return tcg_match_ori(ct, val);
} else if (ct & TCG_CT_CONST_XORI) {
@ -1003,7 +940,7 @@ static inline void tgen64_addi(TCGContext *s, TCGReg dest, int64_t val)
}
static void tgen64_andi(TCGContext *s, TCGReg dest, tcg_target_ulong val)
static void tgen_andi(TCGContext *s, TCGType type, TCGReg dest, uint64_t val)
{
static const S390Opcode ni_insns[4] = {
RI_NILL, RI_NILH, RI_NIHL, RI_NIHH
@ -1011,63 +948,51 @@ static void tgen64_andi(TCGContext *s, TCGReg dest, tcg_target_ulong val)
static const S390Opcode nif_insns[2] = {
RIL_NILF, RIL_NIHF
};
uint64_t valid = (type == TCG_TYPE_I32 ? 0xffffffffull : -1ull);
int i;
/* Look for no-op. */
if (val == -1) {
return;
}
/* Look for the zero-extensions. */
if (val == 0xffffffff) {
if ((val & valid) == 0xffffffff) {
tgen_ext32u(s, dest, dest);
return;
}
if (facilities & FACILITY_EXT_IMM) {
if (val == 0xff) {
if ((val & valid) == 0xff) {
tgen_ext8u(s, TCG_TYPE_I64, dest, dest);
return;
}
if (val == 0xffff) {
if ((val & valid) == 0xffff) {
tgen_ext16u(s, TCG_TYPE_I64, dest, dest);
return;
}
}
/* Try all 32-bit insns that can perform it in one go. */
for (i = 0; i < 4; i++) {
tcg_target_ulong mask = ~(0xffffull << i*16);
if ((val & mask) == mask) {
tcg_out_insn_RI(s, ni_insns[i], dest, val >> i*16);
/* Try all 32-bit insns that can perform it in one go. */
for (i = 0; i < 4; i++) {
tcg_target_ulong mask = ~(0xffffull << i*16);
if (((val | ~valid) & mask) == mask) {
tcg_out_insn_RI(s, ni_insns[i], dest, val >> i*16);
return;
}
}
/* Try all 48-bit insns that can perform it in one go. */
if (facilities & FACILITY_EXT_IMM) {
for (i = 0; i < 2; i++) {
tcg_target_ulong mask = ~(0xffffffffull << i*32);
if (((val | ~valid) & mask) == mask) {
tcg_out_insn_RIL(s, nif_insns[i], dest, val >> i*32);
return;
}
}
}
/* Try all 48-bit insns that can perform it in one go. */
if (facilities & FACILITY_EXT_IMM) {
for (i = 0; i < 2; i++) {
tcg_target_ulong mask = ~(0xffffffffull << i*32);
if ((val & mask) == mask) {
tcg_out_insn_RIL(s, nif_insns[i], dest, val >> i*32);
return;
}
}
}
/* Perform the AND via sequential modifications to the high and low
parts. Do this via recursion to handle 16-bit vs 32-bit masks in
each half. */
tgen64_andi(s, dest, val | 0xffffffff00000000ull);
tgen64_andi(s, dest, val | 0x00000000ffffffffull);
/* Fall back to loading the constant. */
tcg_out_movi(s, type, TCG_TMP0, val);
if (type == TCG_TYPE_I32) {
tcg_out_insn(s, RR, NR, dest, TCG_TMP0);
} else {
/* With no extended-immediate facility, just emit the sequence. */
for (i = 0; i < 4; i++) {
tcg_target_ulong mask = 0xffffull << i*16;
if ((val & mask) != mask) {
tcg_out_insn_RI(s, ni_insns[i], dest, val >> i*16);
}
}
tcg_out_insn(s, RRE, NGR, dest, TCG_TMP0);
}
}
@ -1463,16 +1388,6 @@ static void tcg_out_qemu_st_direct(TCGContext *s, int opc, TCGReg data,
}
#if defined(CONFIG_SOFTMMU)
static void tgen64_andi_tmp(TCGContext *s, TCGReg dest, tcg_target_ulong val)
{
if (tcg_match_andi(0, val)) {
tcg_out_movi(s, TCG_TYPE_I64, TCG_TMP0, val);
tcg_out_insn(s, RRE, NGR, dest, TCG_TMP0);
} else {
tgen64_andi(s, dest, val);
}
}
static void tcg_prepare_qemu_ldst(TCGContext* s, TCGReg data_reg,
TCGReg addr_reg, int mem_index, int opc,
uint16_t **label2_ptr_p, int is_store)
@ -1492,8 +1407,8 @@ static void tcg_prepare_qemu_ldst(TCGContext* s, TCGReg data_reg,
tcg_out_sh64(s, RSY_SRLG, arg1, addr_reg, TCG_REG_NONE,
TARGET_PAGE_BITS - CPU_TLB_ENTRY_BITS);
tgen64_andi_tmp(s, arg0, TARGET_PAGE_MASK | ((1 << s_bits) - 1));
tgen64_andi_tmp(s, arg1, (CPU_TLB_SIZE - 1) << CPU_TLB_ENTRY_BITS);
tgen_andi(s, TCG_TYPE_I64, arg0, TARGET_PAGE_MASK | ((1 << s_bits) - 1));
tgen_andi(s, TCG_TYPE_I64, arg1, (CPU_TLB_SIZE - 1) << CPU_TLB_ENTRY_BITS);
if (is_store) {
ofs = offsetof(CPUArchState, tlb_table[mem_index][0].addr_write);
@ -1777,7 +1692,7 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
case INDEX_op_and_i32:
if (const_args[2]) {
tgen64_andi(s, args[0], args[2] | 0xffffffff00000000ull);
tgen_andi(s, TCG_TYPE_I32, args[0], args[2]);
} else {
tcg_out_insn(s, RR, NR, args[0], args[2]);
}
@ -1982,7 +1897,7 @@ static inline void tcg_out_op(TCGContext *s, TCGOpcode opc,
case INDEX_op_and_i64:
if (const_args[2]) {
tgen64_andi(s, args[0], args[2]);
tgen_andi(s, TCG_TYPE_I64, args[0], args[2]);
} else {
tcg_out_insn(s, RRE, NGR, args[0], args[2]);
}
@ -2156,7 +2071,7 @@ static const TCGTargetOpDef s390_op_defs[] = {
{ INDEX_op_div2_i32, { "b", "a", "0", "1", "r" } },
{ INDEX_op_divu2_i32, { "b", "a", "0", "1", "r" } },
{ INDEX_op_and_i32, { "r", "0", "rWA" } },
{ INDEX_op_and_i32, { "r", "0", "ri" } },
{ INDEX_op_or_i32, { "r", "0", "rWO" } },
{ INDEX_op_xor_i32, { "r", "0", "rWX" } },
@ -2221,7 +2136,7 @@ static const TCGTargetOpDef s390_op_defs[] = {
{ INDEX_op_divu2_i64, { "b", "a", "0", "1", "r" } },
{ INDEX_op_mulu2_i64, { "b", "a", "0", "r" } },
{ INDEX_op_and_i64, { "r", "0", "rA" } },
{ INDEX_op_and_i64, { "r", "0", "ri" } },
{ INDEX_op_or_i64, { "r", "0", "rO" } },
{ INDEX_op_xor_i64, { "r", "0", "rX" } },