Hi Tomek,
Looking at this commit:
commit c0fdecf6c5a5eda9753c63dd039993bd82d4be09
Author: Tomek Grabiec <tgrab...@gmail.com>
Date: Sun Aug 30 21:45:41 2009 +0200
jit: implement precise live range calculation
For each variable its live range is calculated precisely as described
in Wimmer's master thesis "Linear Scan Register Allocator" in 5.6.3
"Build Intervals".
This patch reduces register allocator stress by generating shorter,
more precise live ranges and therefore reduces number of interval spills.
This patch also introduces distinction between even and odd use
positions. Even use positions represent input to instruction and odd
positions represent output. This allows for better register
utilization. Example:
mov r1, r2
add r2, r3
after allocation:
mov ebx, ebx ; this can be optimized out in the future
add ebx, ebx
Signed-off-by: Tomek Grabiec <tgrab...@gmail.com>
Signed-off-by: Pekka Enberg <penb...@cs.helsinki.fi>
there's a pretty strange change:
@@ -198,11 +229,11 @@ static int __insert_spill_reload_insn(struct
live_interval *interval, struct com
* can't insert a reload instruction in the middle of
* instruction.
*/
- assert((interval_start(interval) & 1) == 0);
+ if ((interval_start(interval) & 1) == 0);
Hmm?
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