forked from OSchip/llvm-project
327fac4d75
Summary: Only IMUL16rri uses an extra P0156. IMUL32* and IMUL16rr only use P1. This was computed using https://github.com/google/EXEgesis/blob/master/exegesis/tools/compute_itineraries.cc This can easily be validated by running perf on the following code: ``` int main(int argc, char**argv) { int a = argc; int b = argc; int c = argc; int d = argc; for (int i = 0; i < LOOP_ITERATIONS; ++i) { asm volatile( R"( .rept 10000 imull $0x2, %%edx, %%eax imull $0x2, %%ecx, %%ebx imull $0x2, %%eax, %%edx imull $0x2, %%ebx, %%ecx .endr )" : "+a"(a), "+b"(b), "+c"(c), "+d"(d) : :); } return a+b+c+d; } ``` -> test.cc perf stat -x, -e cycles --pfm-events=uops_executed_port:port_0:u,uops_executed_port:port_1:u,uops_executed_port:port_2:u,uops_executed_port:port_3:u,uops_executed_port:port_4:u,uops_executed_port:port_5:u,uops_executed_port:port_6:u,uops_executed_port:port_7:u test Reviewers: craig.topper, RKSimon, gadi.haber Subscribers: llvm-commits, gchatelet, chandlerc Differential Revision: https://reviews.llvm.org/D43460 llvm-svn: 326877 |
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| .. | ||
| Analysis | ||
| AsmParser | ||
| BinaryFormat | ||
| Bitcode | ||
| CodeGen | ||
| DebugInfo | ||
| Demangle | ||
| ExecutionEngine | ||
| FuzzMutate | ||
| Fuzzer | ||
| IR | ||
| IRReader | ||
| LTO | ||
| LineEditor | ||
| Linker | ||
| MC | ||
| Object | ||
| ObjectYAML | ||
| Option | ||
| Passes | ||
| ProfileData | ||
| Support | ||
| TableGen | ||
| Target | ||
| Testing | ||
| ToolDrivers | ||
| Transforms | ||
| WindowsManifest | ||
| XRay | ||
| CMakeLists.txt | ||
| LLVMBuild.txt | ||