Hi,
When I try '-ftime-report' the numbers differ from 'time', either higher or lower, e.g:
> time clang -cc1 lib/VMCore/Dominators.cpp -Iinclude -Ilib/VMCore -D_DEBUG -D_GNU_SOURCE -D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS -ftime-report -emit-llvm-bc -o t.o
[LLVM pass timers]
===-------------------------------------------------------------------------===
Miscellaneous Ungrouped Timers
===-------------------------------------------------------------------------===
---User Time--- --System Time-- --User+System-- ---Wall Time--- --- Name ---
0.8070 ( 87.2%) 0.0550 ( 73.7%) 0.8620 ( 86.2%) 0.8620 ( 86.2%) Clang front-end timer
0.0747 ( 8.1%) 0.0090 ( 12.0%) 0.0837 ( 8.4%) 0.0840 ( 8.4%) LLVM IR Generation Time
0.0435 ( 4.7%) 0.0106 ( 14.3%) 0.0541 ( 5.4%) 0.0541 ( 5.4%) Code Generation Time
0.9251 (100.0%) 0.0746 (100.0%) 0.9998 (100.0%) 1.0001 (100.0%) Total
real 0m0.903s
user 0m0.827s
sys 0m0.074s
> time clang -cc1 lib/VMCore/Dominators.cpp -Iinclude -Ilib/VMCore -D_DEBUG -D_GNU_SOURCE -D__STDC_LIMIT_MACROS -D__STDC_CONSTANT_MACROS -ftime-report -fsyntax-only
===-------------------------------------------------------------------------===
Miscellaneous Ungrouped Timers
===-------------------------------------------------------------------------===
---User Time--- --System Time-- --User+System-- ---Wall Time--- --- Name ---
0.6823 (100.0%) 0.0317 (100.0%) 0.7139 (100.0%) 0.7139 (100.0%) Clang front-end timer
0.6823 (100.0%) 0.0317 (100.0%) 0.7139 (100.0%) 0.7139 (100.0%) Total
real 0m0.736s
user 0m0.690s
sys 0m0.043s
Why the difference, am I doing something wrong ?
-Argiris
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