diff options
Diffstat (limited to 'results/classifier/118/performance/1892081')
| -rw-r--r-- | results/classifier/118/performance/1892081 | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/results/classifier/118/performance/1892081 b/results/classifier/118/performance/1892081 new file mode 100644 index 00000000..86fe55d3 --- /dev/null +++ b/results/classifier/118/performance/1892081 @@ -0,0 +1,65 @@ +performance: 0.959 +graphic: 0.587 +device: 0.569 +vnc: 0.526 +kernel: 0.461 +network: 0.423 +VMM: 0.412 +risc-v: 0.407 +semantic: 0.395 +socket: 0.363 +ppc: 0.359 +architecture: 0.356 +x86: 0.327 +boot: 0.320 +files: 0.300 +i386: 0.265 +permissions: 0.261 +KVM: 0.249 +arm: 0.246 +hypervisor: 0.236 +TCG: 0.221 +PID: 0.218 +peripherals: 0.211 +mistranslation: 0.200 +assembly: 0.167 +virtual: 0.161 +register: 0.154 +debug: 0.145 +user-level: 0.108 + +Performance improvement when using "QEMU_FLATTEN" with softfloat type conversions + +Attached below is a matrix multiplication program for double data +types. The program performs the casting operation "(double)rand()" +when generating random numbers. + +This operation calls the integer to float softfloat conversion +function "int32_to_float_64". + +Adding the "QEMU_FLATTEN" attribute to the function definition +decreases the instructions per call of the function by about 63%. + +Attached are before and after performance screenshots from +KCachegrind. + + + + + + + +Confirmed, although "65% decrease" is on 0.44% of the total +execution for this test case, so the decrease isn't actually +noticeable. + +Nevertheless, it's a simple enough change. + + +This is an automated cleanup. This bug report has been moved to QEMU's +new bug tracker on gitlab.com and thus gets marked as 'expired' now. +Please continue with the discussion here: + + https://gitlab.com/qemu-project/qemu/-/issues/134 + + |