search for: frontendratio

Displaying 3 results from an estimated 3 matches for "frontendratio".

2016 Mar 08
4
llvm and clang are getting slower
...icity, let's use a simple linear model for the distribution of slowdown between the frontend and backend: a constant factor slowdown for the backend, and an independent constant factor slowdown for the frontend. This gives the following linear system: debugRatio = .1 * backendRatio + (1 - .1) * frontendRatio releaseRatio = .33 * backendRatio + (1 - .33) * frontendRatio Solving this linear system we find that under this simple model, the expected slowdown factors are: backendRatio = 1.77783 frontendRatio = 1.05547 Intuitively, backendRatio comes out larger in this comparison because we see the biggest...
2016 Mar 09
2
llvm and clang are getting slower
...a simple linear model for the distribution of > slowdown between the frontend and backend: a constant factor slowdown for > the backend, and an independent constant factor slowdown for the frontend. > This gives the following linear system: > debugRatio = .1 * backendRatio + (1 - .1) * frontendRatio > releaseRatio = .33 * backendRatio + (1 - .33) * frontendRatio > > Solving this linear system we find that under this simple model, the > expected slowdown factors are: > backendRatio = 1.77783 > frontendRatio = 1.05547 > > Intuitively, backendRatio comes out larger in this...
2016 Mar 08
9
llvm and clang are getting slower
I have just benchmarked building trunk llvm and clang in Debug, Release and LTO modes (see the attached scrip for the cmake lines). The compilers used were clang 3.5, 3.6, 3.7, 3.8 and trunk. In all cases I used the system libgcc and libstdc++. For release builds there is a monotonic increase in each version. From 163 minutes with 3.5 to 212 minutes with trunk. For comparison, gcc 5.3.2 takes