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[Qemu-devel] [PATCH 02/38] tcg: Assert fixed_reg is read-only
From: |
Richard Henderson |
Subject: |
[Qemu-devel] [PATCH 02/38] tcg: Assert fixed_reg is read-only |
Date: |
Fri, 19 Apr 2019 21:34:06 -1000 |
The only fixed_reg is cpu_env, and it should not be modified
during any TB. Therefore code that tries to special-case moves
into a fixed_reg is dead. Remove it.
Signed-off-by: Richard Henderson <address@hidden>
---
tcg/tcg.c | 85 +++++++++++++++++++++++++------------------------------
1 file changed, 38 insertions(+), 47 deletions(-)
diff --git a/tcg/tcg.c b/tcg/tcg.c
index ade6050982..4f77a957b0 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -3279,11 +3279,8 @@ static void tcg_reg_alloc_do_movi(TCGContext *s, TCGTemp
*ots,
tcg_target_ulong val, TCGLifeData arg_life,
TCGRegSet preferred_regs)
{
- if (ots->fixed_reg) {
- /* For fixed registers, we do not do any constant propagation. */
- tcg_out_movi(s, ots->type, ots->reg, val);
- return;
- }
+ /* ENV should not be modified. */
+ tcg_debug_assert(!ots->fixed_reg);
/* The movi is not explicitly generated here. */
if (ots->val_type == TEMP_VAL_REG) {
@@ -3319,6 +3316,9 @@ static void tcg_reg_alloc_mov(TCGContext *s, const TCGOp
*op)
ots = arg_temp(op->args[0]);
ts = arg_temp(op->args[1]);
+ /* ENV should not be modified. */
+ tcg_debug_assert(!ots->fixed_reg);
+
/* Note that otype != itype for no-op truncation. */
otype = ots->type;
itype = ts->type;
@@ -3343,7 +3343,7 @@ static void tcg_reg_alloc_mov(TCGContext *s, const TCGOp
*op)
}
tcg_debug_assert(ts->val_type == TEMP_VAL_REG);
- if (IS_DEAD_ARG(0) && !ots->fixed_reg) {
+ if (IS_DEAD_ARG(0)) {
/* mov to a non-saved dead register makes no sense (even with
liveness analysis disabled). */
tcg_debug_assert(NEED_SYNC_ARG(0));
@@ -3356,7 +3356,7 @@ static void tcg_reg_alloc_mov(TCGContext *s, const TCGOp
*op)
}
temp_dead(s, ots);
} else {
- if (IS_DEAD_ARG(1) && !ts->fixed_reg && !ots->fixed_reg) {
+ if (IS_DEAD_ARG(1) && !ts->fixed_reg) {
/* the mov can be suppressed */
if (ots->val_type == TEMP_VAL_REG) {
s->reg_to_temp[ots->reg] = NULL;
@@ -3509,6 +3509,10 @@ static void tcg_reg_alloc_op(TCGContext *s, const TCGOp
*op)
arg = op->args[i];
arg_ct = &def->args_ct[i];
ts = arg_temp(arg);
+
+ /* ENV should not be modified. */
+ tcg_debug_assert(!ts->fixed_reg);
+
if ((arg_ct->ct & TCG_CT_ALIAS)
&& !const_args[arg_ct->alias_index]) {
reg = new_args[arg_ct->alias_index];
@@ -3517,29 +3521,19 @@ static void tcg_reg_alloc_op(TCGContext *s, const TCGOp
*op)
i_allocated_regs | o_allocated_regs,
op->output_pref[k], ts->indirect_base);
} else {
- /* if fixed register, we try to use it */
- reg = ts->reg;
- if (ts->fixed_reg &&
- tcg_regset_test_reg(arg_ct->u.regs, reg)) {
- goto oarg_end;
- }
reg = tcg_reg_alloc(s, arg_ct->u.regs, o_allocated_regs,
op->output_pref[k], ts->indirect_base);
}
tcg_regset_set_reg(o_allocated_regs, reg);
- /* if a fixed register is used, then a move will be done
afterwards */
- if (!ts->fixed_reg) {
- if (ts->val_type == TEMP_VAL_REG) {
- s->reg_to_temp[ts->reg] = NULL;
- }
- ts->val_type = TEMP_VAL_REG;
- ts->reg = reg;
- /* temp value is modified, so the value kept in memory is
- potentially not the same */
- ts->mem_coherent = 0;
- s->reg_to_temp[reg] = ts;
+ if (ts->val_type == TEMP_VAL_REG) {
+ s->reg_to_temp[ts->reg] = NULL;
}
- oarg_end:
+ ts->val_type = TEMP_VAL_REG;
+ ts->reg = reg;
+ /* temp value is modified, so the value kept in memory is
+ potentially not the same */
+ ts->mem_coherent = 0;
+ s->reg_to_temp[reg] = ts;
new_args[i] = reg;
}
}
@@ -3555,10 +3549,10 @@ static void tcg_reg_alloc_op(TCGContext *s, const TCGOp
*op)
/* move the outputs in the correct register if needed */
for(i = 0; i < nb_oargs; i++) {
ts = arg_temp(op->args[i]);
- reg = new_args[i];
- if (ts->fixed_reg && ts->reg != reg) {
- tcg_out_mov(s, ts->type, ts->reg, reg);
- }
+
+ /* ENV should not be modified. */
+ tcg_debug_assert(!ts->fixed_reg);
+
if (NEED_SYNC_ARG(i)) {
temp_sync(s, ts, o_allocated_regs, 0, IS_DEAD_ARG(i));
} else if (IS_DEAD_ARG(i)) {
@@ -3679,26 +3673,23 @@ static void tcg_reg_alloc_call(TCGContext *s, TCGOp *op)
for(i = 0; i < nb_oargs; i++) {
arg = op->args[i];
ts = arg_temp(arg);
+
+ /* ENV should not be modified. */
+ tcg_debug_assert(!ts->fixed_reg);
+
reg = tcg_target_call_oarg_regs[i];
tcg_debug_assert(s->reg_to_temp[reg] == NULL);
-
- if (ts->fixed_reg) {
- if (ts->reg != reg) {
- tcg_out_mov(s, ts->type, ts->reg, reg);
- }
- } else {
- if (ts->val_type == TEMP_VAL_REG) {
- s->reg_to_temp[ts->reg] = NULL;
- }
- ts->val_type = TEMP_VAL_REG;
- ts->reg = reg;
- ts->mem_coherent = 0;
- s->reg_to_temp[reg] = ts;
- if (NEED_SYNC_ARG(i)) {
- temp_sync(s, ts, allocated_regs, 0, IS_DEAD_ARG(i));
- } else if (IS_DEAD_ARG(i)) {
- temp_dead(s, ts);
- }
+ if (ts->val_type == TEMP_VAL_REG) {
+ s->reg_to_temp[ts->reg] = NULL;
+ }
+ ts->val_type = TEMP_VAL_REG;
+ ts->reg = reg;
+ ts->mem_coherent = 0;
+ s->reg_to_temp[reg] = ts;
+ if (NEED_SYNC_ARG(i)) {
+ temp_sync(s, ts, allocated_regs, 0, IS_DEAD_ARG(i));
+ } else if (IS_DEAD_ARG(i)) {
+ temp_dead(s, ts);
}
}
}
--
2.17.1
- [Qemu-devel] [PATCH 00/38] tcg vector improvements, Richard Henderson, 2019/04/20
- [Qemu-devel] [PATCH 01/38] target/arm: Fill in .opc for cmtst_op, Richard Henderson, 2019/04/20
- [Qemu-devel] [PATCH 02/38] tcg: Assert fixed_reg is read-only,
Richard Henderson <=
- [Qemu-devel] [PATCH 04/38] tcg: Support cross-class moves without instruction support, Richard Henderson, 2019/04/20
- [Qemu-devel] [PATCH 03/38] tcg: Return bool success from tcg_out_mov, Richard Henderson, 2019/04/20
- [Qemu-devel] [PATCH 05/38] tcg: Allow add_vec, sub_vec, neg_vec, not_vec to be expanded, Richard Henderson, 2019/04/20
- [Qemu-devel] [PATCH 06/38] tcg: Promote tcg_out_{dup, dupi}_vec to backend interface, Richard Henderson, 2019/04/20
- [Qemu-devel] [PATCH 08/38] tcg: Add tcg_out_dupm_vec to the backend interface, Richard Henderson, 2019/04/20