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tcg/s390x: Tighten constraints for and_i64 

Let the register allocator handle such immediates by matching
only what one insn can achieve.

Reviewed-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
master
Richard Henderson 2022-12-08 18:06:03 +00:00
parent b2509acc60
commit 4134083f80
3 changed files with 61 additions and 56 deletions
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1
tcg/s390x/tcg-target-con-set.h
View File

@ -25,6 +25,7 @@ C_O1_I2(r, 0, rJ)
C_O1_I2(r, r, ri)
C_O1_I2(r, r, rJ)
C_O1_I2(r, r, rK)
C_O1_I2(r, r, rNKR)
C_O1_I2(r, rZ, r)
C_O1_I2(v, v, r)
C_O1_I2(v, v, v)

2
tcg/s390x/tcg-target-con-str.h
View File

@ -21,4 +21,6 @@ CONST('A', TCG_CT_CONST_S33)
CONST('I', TCG_CT_CONST_S16)
CONST('J', TCG_CT_CONST_S32)
CONST('K', TCG_CT_CONST_P32)
CONST('N', TCG_CT_CONST_INV)
CONST('R', TCG_CT_CONST_INVRISBG)
CONST('Z', TCG_CT_CONST_ZERO)

114
tcg/s390x/tcg-target.c.inc
View File

@ -33,11 +33,13 @@
#include "../tcg-pool.c.inc"
#include "elf.h"
#define TCG_CT_CONST_S16 0x100
#define TCG_CT_CONST_S32 0x200
#define TCG_CT_CONST_S33 0x400
#define TCG_CT_CONST_ZERO 0x800
#define TCG_CT_CONST_P32 0x1000
#define TCG_CT_CONST_S16 (1 << 8)
#define TCG_CT_CONST_S32 (1 << 9)
#define TCG_CT_CONST_S33 (1 << 10)
#define TCG_CT_CONST_ZERO (1 << 11)
#define TCG_CT_CONST_P32 (1 << 12)
#define TCG_CT_CONST_INV (1 << 13)
#define TCG_CT_CONST_INVRISBG (1 << 14)
#define ALL_GENERAL_REGS MAKE_64BIT_MASK(0, 16)
#define ALL_VECTOR_REGS MAKE_64BIT_MASK(32, 32)
@ -530,6 +532,38 @@ static int is_const_p32(uint64_t val)
return -1;
}
/*
* Accept bit patterns like these:
* 0....01....1
* 1....10....0
* 1..10..01..1
* 0..01..10..0
* Copied from gcc sources.
*/
static bool risbg_mask(uint64_t c)
{
uint64_t lsb;
/* We don't change the number of transitions by inverting,
so make sure we start with the LSB zero. */
if (c & 1) {
c = ~c;
}
/* Reject all zeros or all ones. */
if (c == 0) {
return false;
}
/* Find the first transition. */
lsb = c & -c;
/* Invert to look for a second transition. */
c = ~c;
/* Erase the first transition. */
c &= -lsb;
/* Find the second transition, if any. */
lsb = c & -c;
/* Match if all the bits are 1's, or if c is zero. */
return c == -lsb;
}
/* Test if a constant matches the constraint. */
static bool tcg_target_const_match(int64_t val, TCGType type, int ct)
{
@ -552,6 +586,9 @@ static bool tcg_target_const_match(int64_t val, TCGType type, int ct)
return val == 0;
}
if (ct & TCG_CT_CONST_INV) {
val = ~val;
}
/*
* Note that is_const_p16 is a subset of is_const_p32,
* so we don't need both constraints.
@ -559,6 +596,9 @@ static bool tcg_target_const_match(int64_t val, TCGType type, int ct)
if ((ct & TCG_CT_CONST_P32) && is_const_p32(val) >= 0) {
return true;
}
if ((ct & TCG_CT_CONST_INVRISBG) && risbg_mask(~val)) {
return true;
}
return 0;
}
@ -1057,36 +1097,6 @@ static inline void tgen_ext32u(TCGContext *s, TCGReg dest, TCGReg src)
tcg_out_insn(s, RRE, LLGFR, dest, src);
}
/* Accept bit patterns like these:
0....01....1
1....10....0
1..10..01..1
0..01..10..0
Copied from gcc sources. */
static inline bool risbg_mask(uint64_t c)
{
uint64_t lsb;
/* We don't change the number of transitions by inverting,
so make sure we start with the LSB zero. */
if (c & 1) {
c = ~c;
}
/* Reject all zeros or all ones. */
if (c == 0) {
return false;
}
/* Find the first transition. */
lsb = c & -c;
/* Invert to look for a second transition. */
c = ~c;
/* Erase the first transition. */
c &= -lsb;
/* Find the second transition, if any. */
lsb = c & -c;
/* Match if all the bits are 1's, or if c is zero. */
return c == -lsb;
}
static void tgen_andi_risbg(TCGContext *s, TCGReg out, TCGReg in, uint64_t val)
{
int msb, lsb;
@ -1126,34 +1136,25 @@ static void tgen_andi(TCGContext *s, TCGType type, TCGReg dest, uint64_t val)
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 | ~valid) & mask) == mask) {
tcg_out_insn_RI(s, ni_insns[i], dest, val >> i * 16);
return;
}
i = is_const_p16(~val & valid);
if (i >= 0) {
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. */
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;
}
i = is_const_p32(~val & valid);
tcg_debug_assert(i == 0 || type != TCG_TYPE_I32);
if (i >= 0) {
tcg_out_insn_RIL(s, nif_insns[i], dest, val >> (i * 32));
return;
}
if (risbg_mask(val)) {
tgen_andi_risbg(s, dest, dest, val);
return;
}
tcg_out_movi(s, type, TCG_TMP0, val);
if (type == TCG_TYPE_I32) {
tcg_out_insn(s, RR, NR, dest, TCG_TMP0);
} else {
tcg_out_insn(s, RRE, NGR, dest, TCG_TMP0);
}
g_assert_not_reached();
}
static void tgen_ori(TCGContext *s, TCGReg dest, uint64_t val)
@ -2935,10 +2936,11 @@ static TCGConstraintSetIndex tcg_target_op_def(TCGOpcode op)
case INDEX_op_sub_i32:
case INDEX_op_sub_i64:
case INDEX_op_and_i32:
case INDEX_op_and_i64:
case INDEX_op_or_i32:
case INDEX_op_xor_i32:
return C_O1_I2(r, r, ri);
case INDEX_op_and_i64:
return C_O1_I2(r, r, rNKR);
case INDEX_op_or_i64:
case INDEX_op_xor_i64:
return C_O1_I2(r, r, rK);