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[Qemu-devel] [PATCH v3 10/26] tcg: don't explicitly save globals and tem
From: |
Aurelien Jarno |
Subject: |
[Qemu-devel] [PATCH v3 10/26] tcg: don't explicitly save globals and temps |
Date: |
Fri, 19 Oct 2012 23:38:59 +0200 |
The liveness analysis ensures that globals and temps are at the correct
state at a basic block end or with an op with side effects. Avoid
looping on all temps, this can be time consuming on targets with a lot
of globals. Keep an assert in debug mode.
Reviewed-by: Richard Henderson <address@hidden>
Signed-off-by: Aurelien Jarno <address@hidden>
---
tcg/tcg.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/tcg/tcg.c b/tcg/tcg.c
index 8333667..840e252 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -1648,8 +1648,14 @@ static inline void temp_sync(TCGContext *s, int temp,
TCGRegSet allocated_regs)
temporary registers needs to be allocated to store a constant. */
static inline void temp_save(TCGContext *s, int temp, TCGRegSet allocated_regs)
{
+#ifdef USE_LIVENESS_ANALYSIS
+ /* The liveness analysis already ensures that globals are back
+ in memory. Keep an assert for safety. */
+ assert(s->temps[temp].val_type == TEMP_VAL_MEM ||
s->temps[temp].fixed_reg);
+#else
temp_sync(s, temp, allocated_regs);
temp_dead(s, temp);
+#endif
}
/* save globals to their canonical location and assume they can be
@@ -1676,7 +1682,13 @@ static void tcg_reg_alloc_bb_end(TCGContext *s,
TCGRegSet allocated_regs)
if (ts->temp_local) {
temp_save(s, i, allocated_regs);
} else {
+#ifdef USE_LIVENESS_ANALYSIS
+ /* The liveness analysis already ensures that temps are dead.
+ Keep an assert for safety. */
+ assert(ts->val_type == TEMP_VAL_DEAD);
+#else
temp_dead(s, i);
+#endif
}
}
--
1.7.10.4
- [Qemu-devel] [PATCH 07/26] tcg: rewrite tcg_reg_alloc_mov(), (continued)
- [Qemu-devel] [PATCH 07/26] tcg: rewrite tcg_reg_alloc_mov(), Aurelien Jarno, 2012/10/19
- [Qemu-devel] [PATCH v3 20/26] target-mips: rename helper flags, Aurelien Jarno, 2012/10/19
- [Qemu-devel] [PATCH v3 26/26] tcg: remove compatiblity call flags, Aurelien Jarno, 2012/10/19
- [Qemu-devel] [PATCH v3 19/26] target-microblaze: rename helper flags, Aurelien Jarno, 2012/10/19
- [Qemu-devel] [PATCH v3 14/26] tcg: rework TCG helper flags, Aurelien Jarno, 2012/10/19
- [Qemu-devel] [PATCH v3 04/26] tcg: sync output arguments on liveness request, Aurelien Jarno, 2012/10/19
- [Qemu-devel] [PATCH v3 03/26] tcg: add temp_sync(), Aurelien Jarno, 2012/10/19
- [Qemu-devel] [PATCH v3 08/26] tcg: always mark dead input arguments as dead, Aurelien Jarno, 2012/10/19
- [Qemu-devel] [PATCH v3 12/26] tcg: forbid ld/st function to modify globals, Aurelien Jarno, 2012/10/19
- [Qemu-devel] [PATCH v3 13/26] tcg: synchronize globals for ops with side effects, Aurelien Jarno, 2012/10/19
- [Qemu-devel] [PATCH v3 10/26] tcg: don't explicitly save globals and temps,
Aurelien Jarno <=
- [Qemu-devel] [PATCH v3 16/26] target-arm: rename helper flags, Aurelien Jarno, 2012/10/19
- [Qemu-devel] [PATCH v3 22/26] target-s390x: rename helper flags, Aurelien Jarno, 2012/10/19
- Re: [Qemu-devel] [PATCH v3 00/26] tcg: rework liveness analysis and register allocator, Richard Henderson, 2012/10/21