http://llvm.org/bugs/show_bug.cgi?id=10584
Summary: Extremely slow compilation spending time in Greedy
Register Allocator
Product: libraries
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: Register Allocator
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=7015)
--> (http://llvm.org/bugs/attachment.cgi?id=7015)
Test case for slow register allocator
Attached is the test input. Compiling with "clang -O2" takes over 1h here (on a
i7) and peaks at 8GB RES. According to -ftime-report, the majority of the time
is spend in the following passes:
---User Time--- --System Time-- --User+System-- ---Wall Time--- ---
Name ---
2717.0700 ( 51.0%) 3.1400 ( 36.3%) 2720.2100 ( 51.0%) 2725.2743 ( 51.0%)
Greedy Register Allocator
1458.3400 ( 27.4%) 3.7500 ( 43.4%) 1462.0900 ( 27.4%) 1465.1049 ( 27.4%)
Value Propagation
316.5900 ( 5.9%) 0.4300 ( 5.0%) 317.0200 ( 5.9%) 317.5998 ( 5.9%)
Simple Register Coalescing
Report for the register allocator:
---User Time--- --System Time-- --User+System-- ---Wall Time--- ---
Name ---
2512.5500 ( 92.5%) 2.9600 ( 94.9%) 2515.5100 ( 92.5%) 2520.2120 ( 92.5%)
Spiller
200.5100 ( 7.4%) 0.1400 ( 4.5%) 200.6500 ( 7.4%) 200.9533 ( 7.4%)
Global Splitting
1.9700 ( 0.1%) 0.0200 ( 0.6%) 1.9900 ( 0.1%) 1.9189 ( 0.1%) Evict
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