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tcg-ppc64: Handle long offsets better 

Previously we'd only handle 16-bit offsets from memory operand without falling
back to indexed, but it's easy to use ADDIS to handle full 32-bit offsets.

This also lets us unify code that existed inline in tcg_out_op for handling
addition of large constants.

The new R2 temporary was marked reserved for the AIX calling convention, but
the register really is call-clobbered and since tcg generated code has no use
for a TOC, it's available for use.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2013-07-31 11:36:42 -07:00
parent 5e1702b074
commit b18d5d2b80
1 changed files with 75 additions and 74 deletions
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149
tcg/ppc64/tcg-target.c
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@ -119,7 +119,6 @@ static const int tcg_target_reg_alloc_order[] = {
TCG_REG_R31,
TCG_REG_R12, /* call clobbered, non-arguments */
TCG_REG_R11,
TCG_REG_R2,
TCG_REG_R10, /* call clobbered, arguments */
TCG_REG_R9,
TCG_REG_R8,
@ -746,25 +745,55 @@ static void tcg_out_call(TCGContext *s, tcg_target_long arg, int const_arg)
#endif
}
static void tcg_out_ldst(TCGContext *s, TCGReg ret, TCGReg addr,
int offset, int op1, int op2)
static void tcg_out_mem_long(TCGContext *s, int opi, int opx, TCGReg rt,
TCGReg base, tcg_target_long offset)
{
if (offset == (int16_t) offset) {
tcg_out32(s, op1 | TAI(ret, addr, offset));
} else {
tcg_out_movi(s, TCG_TYPE_I64, TCG_REG_R0, offset);
tcg_out32(s, op2 | TAB(ret, addr, TCG_REG_R0));
}
}
tcg_target_long orig = offset, l0, l1, extra = 0, align = 0;
TCGReg rs = TCG_REG_R2;
static void tcg_out_ldsta(TCGContext *s, TCGReg ret, TCGReg addr,
int offset, int op1, int op2)
{
if (offset == (int16_t)(offset & ~3)) {
tcg_out32(s, op1 | TAI(ret, addr, offset));
} else {
tcg_out_movi(s, TCG_TYPE_I64, TCG_REG_R0, offset);
tcg_out32(s, op2 | TAB(ret, addr, TCG_REG_R0));
assert(rt != TCG_REG_R2 && base != TCG_REG_R2);
switch (opi) {
case LD: case LWA:
align = 3;
/* FALLTHRU */
default:
if (rt != TCG_REG_R0) {
rs = rt;
}
break;
case STD:
align = 3;
break;
case STB: case STH: case STW:
break;
}
/* For unaligned, or very large offsets, use the indexed form. */
if (offset & align || offset != (int32_t)offset) {
tcg_out_movi(s, TCG_TYPE_I64, TCG_REG_R2, orig);
tcg_out32(s, opx | TAB(rt, base, TCG_REG_R2));
return;
}
l0 = (int16_t)offset;
offset = (offset - l0) >> 16;
l1 = (int16_t)offset;
if (l1 < 0 && orig >= 0) {
extra = 0x4000;
l1 = (int16_t)(offset - 0x4000);
}
if (l1) {
tcg_out32(s, ADDIS | TAI(rs, base, l1));
base = rs;
}
if (extra) {
tcg_out32(s, ADDIS | TAI(rs, base, extra));
base = rs;
}
if (opi != ADDI || base != rt || l0 != 0) {
tcg_out32(s, opi | TAI(rt, base, l0));
}
}
@ -1074,24 +1103,30 @@ static void tcg_target_qemu_prologue(TCGContext *s)
tcg_out32(s, BCLR | BO_ALWAYS);
}
static void tcg_out_ld(TCGContext *s, TCGType type, TCGReg ret, TCGReg arg1,
intptr_t arg2)
static inline void tcg_out_ld(TCGContext *s, TCGType type, TCGReg ret,
TCGReg arg1, intptr_t arg2)
{
int opi, opx;
if (type == TCG_TYPE_I32) {
tcg_out_ldst(s, ret, arg1, arg2, LWZ, LWZX);
opi = LWZ, opx = LWZX;
} else {
tcg_out_ldsta(s, ret, arg1, arg2, LD, LDX);
opi = LD, opx = LDX;
}
tcg_out_mem_long(s, opi, opx, ret, arg1, arg2);
}
static void tcg_out_st(TCGContext *s, TCGType type, TCGReg arg, TCGReg arg1,
intptr_t arg2)
static inline void tcg_out_st(TCGContext *s, TCGType type, TCGReg arg,
TCGReg arg1, intptr_t arg2)
{
int opi, opx;
if (type == TCG_TYPE_I32) {
tcg_out_ldst(s, arg, arg1, arg2, STW, STWX);
opi = STW, opx = STWX;
} else {
tcg_out_ldsta(s, arg, arg1, arg2, STD, STDX);
opi = STD, opx = STDX;
}
tcg_out_mem_long(s, opi, opx, arg, arg1, arg2);
}
static void tcg_out_cmp(TCGContext *s, int cond, TCGArg arg1, TCGArg arg2,
@ -1449,61 +1484,52 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc, const TCGArg *args,
break;
case INDEX_op_ld8u_i32:
case INDEX_op_ld8u_i64:
tcg_out_ldst(s, args[0], args[1], args[2], LBZ, LBZX);
tcg_out_mem_long(s, LBZ, LBZX, args[0], args[1], args[2]);
break;
case INDEX_op_ld8s_i32:
case INDEX_op_ld8s_i64:
tcg_out_ldst(s, args[0], args[1], args[2], LBZ, LBZX);
tcg_out_mem_long(s, LBZ, LBZX, args[0], args[1], args[2]);
tcg_out32(s, EXTSB | RS(args[0]) | RA(args[0]));
break;
case INDEX_op_ld16u_i32:
case INDEX_op_ld16u_i64:
tcg_out_ldst(s, args[0], args[1], args[2], LHZ, LHZX);
tcg_out_mem_long(s, LHZ, LHZX, args[0], args[1], args[2]);
break;
case INDEX_op_ld16s_i32:
case INDEX_op_ld16s_i64:
tcg_out_ldst(s, args[0], args[1], args[2], LHA, LHAX);
tcg_out_mem_long(s, LHA, LHAX, args[0], args[1], args[2]);
break;
case INDEX_op_ld_i32:
case INDEX_op_ld32u_i64:
tcg_out_ldst(s, args[0], args[1], args[2], LWZ, LWZX);
tcg_out_mem_long(s, LWZ, LWZX, args[0], args[1], args[2]);
break;
case INDEX_op_ld32s_i64:
tcg_out_ldsta(s, args[0], args[1], args[2], LWA, LWAX);
tcg_out_mem_long(s, LWA, LWAX, args[0], args[1], args[2]);
break;
case INDEX_op_ld_i64:
tcg_out_ldsta(s, args[0], args[1], args[2], LD, LDX);
tcg_out_mem_long(s, LD, LDX, args[0], args[1], args[2]);
break;
case INDEX_op_st8_i32:
case INDEX_op_st8_i64:
tcg_out_ldst(s, args[0], args[1], args[2], STB, STBX);
tcg_out_mem_long(s, STB, STBX, args[0], args[1], args[2]);
break;
case INDEX_op_st16_i32:
case INDEX_op_st16_i64:
tcg_out_ldst(s, args[0], args[1], args[2], STH, STHX);
tcg_out_mem_long(s, STH, STHX, args[0], args[1], args[2]);
break;
case INDEX_op_st_i32:
case INDEX_op_st32_i64:
tcg_out_ldst(s, args[0], args[1], args[2], STW, STWX);
tcg_out_mem_long(s, STW, STWX, args[0], args[1], args[2]);
break;
case INDEX_op_st_i64:
tcg_out_ldsta(s, args[0], args[1], args[2], STD, STDX);
tcg_out_mem_long(s, STD, STDX, args[0], args[1], args[2]);
break;
case INDEX_op_add_i32:
a0 = args[0], a1 = args[1], a2 = args[2];
if (const_args[2]) {
int32_t l, h;
do_addi_32:
l = (int16_t)a2;
h = a2 - l;
if (h) {
tcg_out32(s, ADDIS | TAI(a0, a1, h >> 16));
a1 = a0;
}
if (l || a0 != a1) {
tcg_out32(s, ADDI | TAI(a0, a1, l));
}
tcg_out_mem_long(s, ADDI, ADD, a0, a1, (int32_t)a2);
} else {
tcg_out32(s, ADD | TAB(a0, a1, a2));
}
@ -1680,32 +1706,8 @@ static void tcg_out_op(TCGContext *s, TCGOpcode opc, const TCGArg *args,
case INDEX_op_add_i64:
a0 = args[0], a1 = args[1], a2 = args[2];
if (const_args[2]) {
int32_t l0, h1, h2;
do_addi_64:
/* We can always split any 32-bit signed constant into 3 pieces.
Note the positive 0x80000000 coming from the sub_i64 path,
handled with the same code we need for eg 0x7fff8000. */
assert(a2 == (int32_t)a2 || a2 == 0x80000000);
l0 = (int16_t)a2;
h1 = a2 - l0;
h2 = 0;
if (h1 < 0 && (int64_t)a2 > 0) {
h2 = 0x40000000;
h1 = a2 - h2 - l0;
}
assert((TCGArg)h2 + h1 + l0 == a2);
if (h2) {
tcg_out32(s, ADDIS | TAI(a0, a1, h2 >> 16));
a1 = a0;
}
if (h1) {
tcg_out32(s, ADDIS | TAI(a0, a1, h1 >> 16));
a1 = a0;
}
if (l0 || a0 != a1) {
tcg_out32(s, ADDI | TAI(a0, a1, l0));
}
tcg_out_mem_long(s, ADDI, ADD, a0, a1, a2);
} else {
tcg_out32(s, ADD | TAB(a0, a1, a2));
}
@ -2144,10 +2146,9 @@ static void tcg_target_init(TCGContext *s)
tcg_regset_clear(s->reserved_regs);
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R0); /* tcg temp */
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R1); /* stack pointer */
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R2); /* mem temp */
#ifdef __APPLE__
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R11); /* ??? */
#else
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R2); /* toc */
#endif
tcg_regset_set_reg(s->reserved_regs, TCG_REG_R13); /* thread pointer */