| Issue |
139274
|
| Summary |
548.exchange2_r has 30% performance regression between LLVM 18/19 and LLVM 20 on amd64
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
jiegec
|
548.exchange2_r built using flang-new-18:
```shell
548.exchange2_r: time (ms) = 181666
548.exchange2_r: clock freq (MHz) = 5701.6834
548.exchange2_r: instructions = 4.05239e+12
548.exchange2_r: branch instructions = 5.80567e+11
548.exchange2_r: ipc = 3.9123
548.exchange2_r: misprediction rate (%) = 0.8200
548.exchange2_r: mpki = 1.1747
```
548.exchange2_r built using flang-new-19:
```shell
548.exchange2_r: time (ms) = 182113
548.exchange2_r: clock freq (MHz) = 5701.3884
548.exchange2_r: instructions = 4.03508e+12
548.exchange2_r: branch instructions = 5.50304e+11
548.exchange2_r: ipc = 3.8863
548.exchange2_r: misprediction rate (%) = 0.7708
548.exchange2_r: mpki = 1.0513
```
548.exchange2_r built using flang-new-20:
```shell
548.exchange2_r: time (ms) = 240537
548.exchange2_r: clock freq (MHz) = 5700.9669
548.exchange2_r: instructions = 5.15502e+12
548.exchange2_r: branch instructions = 5.42299e+11
548.exchange2_r: ipc = 3.7592
548.exchange2_r: misprediction rate (%) = 0.7719
548.exchange2_r: mpki = 0.8121
```
A performance regression of ~30% is observed.
Hardware: Intel Core i9-14900K 5.7 GHz
Full results and compilation flags are available at https://jia.je/benchmark/ (in chinese).
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