[Bug rtl-optimization/40838] gcc shouldn't assume that the stack is aligned

[hjl dot tools at gmail dot com]

------- Comment #65 from hjl dot tools at gmail dot com  2009-10-31 16:47 -------
Here are the differences of "-m32 -O3 -msse2 -mfpmath=sse -ffast-math
-funroll-loops" vs. "-m32 -O3 -msse2 -mfpmath=sse -ffast-math -funroll-loops
-mstackrealign" using ix86/gcc-4_4-branch on Intel Core i7:

164.gzip                         -0.604595%
175.vpr                          -0.0831255%
176.gcc                          -0.567698%
181.mcf                          0.142653%
186.crafty                       0.0783699%
197.parser                       -0.355714%
252.eon                          -2.32775%
253.perlbmk                      0.943693%
254.gap                          0.553825%
255.vortex                       0.226978%
256.bzip2                        0.291971%
300.twolf                        0.183936%
SPECint_base2000                 -0.126734%
168.wupwise                      -0.345871%
171.swim                         -1.42753%
172.mgrid                        0.496166%
173.applu                        0.467758%
177.mesa                         0.151791%
178.galgel                       -0.227652%
179.art                          0.338073%
183.equake                       -0.308569%
187.facerec                      0.189798%
188.ammp                         1.00536%
189.lucas                        -2.18097%
191.fma3d                        -1.0162%
200.sixtrack                     0.237906%
301.apsi                         1.00138%
SPECfp_base2000                 -0.121114%
400.perlbench                    0.4%
401.bzip2                        0%
403.gcc                          0%
429.mcf                          0%
445.gobmk                        -0.478469%
456.hmmer                        0%
458.sjeng                        0.452489%
462.libquantum                   -0.689655%
464.h264ref                      -0.331126%
471.omnetpp                      0.483092%
473.astar                        0.666667%
483.xalancbmk                    -0.358423%
SPECint(R)_base2006              0%
410.bwaves                       11.2108%
416.gamess                       -0.543478%
433.milc                         1.37615%
434.zeusmp                       -0.497512%
435.gromacs                      0%
436.cactusADM                    -0.763359%
437.leslie3d                     0.625%
444.namd                         0%
447.dealII                       -0.689655%
450.soplex                       -1.2987%
453.povray                       -0.904977%
454.calculix                     0.621118%
459.GemsFDTD                     -0.625%
465.tonto                        0%
470.lbm                          0.925926%
481.wrf                          -0.588235%
482.sphinx3                      -0.96463%
SPECfp(R)_base2006               0%


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40838