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target/sparc: Remove the constant pool 

Partially reverts ab20bdc116.  The 14-bit displacement that we
allowed to reach the constant pool is not always sufficient.
Retain the tb-relative addressing, as that is how most return
values from the tb are computed.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2018-12-17 00:30:21 +03:00
parent 58b1f0f21e
commit f6823cbe37
1 changed files with 9 additions and 38 deletions
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47
tcg/sparc/tcg-target.inc.c
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@ -311,24 +311,6 @@ static void patch_reloc(tcg_insn_unit *code_ptr, int type,
insn &= ~INSN_OFF19(-1);
insn |= INSN_OFF19(pcrel);
break;
case R_SPARC_13:
/* Note that we're abusing this reloc type for our own needs. */
if (!check_fit_ptr(value, 13)) {
int adj = (value > 0 ? 0xff8 : -0x1000);
value -= adj;
assert(check_fit_ptr(value, 13));
*code_ptr++ = (ARITH_ADD | INSN_RD(TCG_REG_T2)
| INSN_RS1(TCG_REG_TB) | INSN_IMM13(adj));
insn ^= INSN_RS1(TCG_REG_TB) ^ INSN_RS1(TCG_REG_T2);
}
insn &= ~INSN_IMM13(-1);
insn |= INSN_IMM13(value);
break;
case R_SPARC_32:
/* Note that we're abusing this reloc type for our own needs. */
code_ptr[0] = deposit32(code_ptr[0], 0, 22, value >> 10);
code_ptr[1] = deposit32(code_ptr[1], 0, 10, value);
return;
default:
g_assert_not_reached();
}
@ -459,6 +441,15 @@ static void tcg_out_movi_int(TCGContext *s, TCGType type, TCGReg ret,
return;
}
/* A 13-bit constant relative to the TB. */
if (!in_prologue && USE_REG_TB) {
test = arg - (uintptr_t)s->code_gen_ptr;
if (check_fit_ptr(test, 13)) {
tcg_out_arithi(s, ret, TCG_REG_TB, test, ARITH_ADD);
return;
}
}
/* A 32-bit constant, or 32-bit zero-extended to 64-bits. */
if (type == TCG_TYPE_I32 || arg == (uint32_t)arg) {
tcg_out_sethi(s, ret, arg);
@ -488,26 +479,6 @@ static void tcg_out_movi_int(TCGContext *s, TCGType type, TCGReg ret,
return;
}
if (!in_prologue) {
if (USE_REG_TB) {
intptr_t diff = arg - (uintptr_t)s->code_gen_ptr;
if (check_fit_ptr(diff, 13)) {
tcg_out_arithi(s, ret, TCG_REG_TB, diff, ARITH_ADD);
} else {
new_pool_label(s, arg, R_SPARC_13, s->code_ptr,
-(intptr_t)s->code_gen_ptr);
tcg_out32(s, LDX | INSN_RD(ret) | INSN_RS1(TCG_REG_TB));
/* May be used to extend the 13-bit range in patch_reloc. */
tcg_out32(s, NOP);
}
} else {
new_pool_label(s, arg, R_SPARC_32, s->code_ptr, 0);
tcg_out_sethi(s, ret, 0);
tcg_out32(s, LDX | INSN_RD(ret) | INSN_RS1(ret) | INSN_IMM13(0));
}
return;
}
/* A 64-bit constant decomposed into 2 32-bit pieces. */
if (check_fit_i32(lo, 13)) {
hi = (arg - lo) >> 32;