[PATCH] D67240: [NOT FOR REVIEW][NOT FOR COMMIT] X86 machine instruction counting

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri created this revision.
Herald added subscribers: llvm-commits, hiraditya, mgorny.
Herald added a project: LLVM.

As discussed in https://reviews.llvm.org/D65148#1658556

  $ cat /tmp/test.c 
  int a();
  int b();
  int c(int d) {
      return (d < 0) ? a() : b();
  }
  $ ./bin/clang -o - -S -g0 -O3 /tmp/test.c -mllvm -print-after-all -mllvm -debug -mllvm -stats 2>&1 | tail -n 76
  # End machine code for function c.
  
  ********** COUNT MACHINE INSTRUCTIONS: c **********
  Found conditional branch instruction: JCC_1 %bb.1, 8, implicit $eflags
  
  Found unconditional branch instruction: TAILJMPd64 @b, <regmask $bh $bl $bp $bph $bpl $bx $ebp $ebx $hbp $hbx $rbp $rbx $r12 $r13 $r14 $r15 $r12b $r13b $r14b $r15b $r12bh $r13bh $r14bh $r15bh $r12d $r13d $r14d $r15d $r12w $r13w $r14w $r15w $r12wh and 3 more...>, implicit $rsp, implicit $ssp, implicit $rsp, implicit $ssp, implicit killed $al
  
  Found unconditional branch instruction: TAILJMPd64 @a, <regmask $bh $bl $bp $bph $bpl $bx $ebp $ebx $hbp $hbx $rbp $rbx $r12 $r13 $r14 $r15 $r12b $r13b $r14b $r15b $r12bh $r13bh $r14bh $r15bh $r12d $r13d $r14d $r15d $r12w $r13w $r14w $r15w $r12wh and 3 more...>, implicit $rsp, implicit $ssp, implicit $rsp, implicit $ssp, implicit killed $al
  
          discovered a new reachable node %bb.0
          discovered a new reachable node %bb.1
          discovered a new reachable node %bb.2
          .text
          .file   "test.c"
          .globl  c                       # -- Begin function c
          .p2align        4, 0x90
          .type   c, at function
  c:                                      # @c
          .cfi_startproc
  # %bb.0:                                # %entry
          xorl    %eax, %eax
          testl   %edi, %edi
          js      .LBB0_1
  # %bb.2:                                # %cond.false
          jmp     b                       # TAILCALL
  .LBB0_1:                                # %cond.true
          jmp     a                       # TAILCALL
  .Lfunc_end0:
          .size   c, .Lfunc_end0-c
          .cfi_endproc
                                          # -- End function
  
          .ident  "clang version 10.0.0 (git at github.com:LebedevRI/llvm-project.git 1cf013a6519b38fdc585e35bf241c069431be4ca)"
          .section        ".note.GNU-stack","", at progbits
          .addrsig
  ===-------------------------------------------------------------------------===
                            ... Statistics Collected ...
  ===-------------------------------------------------------------------------===
  
   5 asm-printer       - Number of machine instrs printed
   1 branch-folder     - Number of times common instructions are hoisted
   1 cgscc-passmgr     - Maximum CGSCCPassMgr iterations on one SCC
   2 codegenprepare    - Number of return instructions duplicated
   4 dagcombine        - Number of dag nodes combined
   3 globalopt         - Number of globals marked unnamed_addr
   2 instcombine       - Number of insts combined
   3 isel              - Number of blocks selected using DAG
  14 isel              - Number of times dag isel has to try another path
   1 isel              - Number of entry blocks encountered
   1 machine-scheduler - Number of instr pairs fused
   1 mem2reg           - Number of alloca's promoted with a single store
   1 prologepilog      - Number of functions seen in PEI
   1 regalloc          - Number of registers assigned
   2 regalloc          - Number of instructions deleted by DCE
   1 regalloc          - Number of identity moves eliminated after rewriting
   2 regalloc          - Number of instructions re-materialized
   2 regalloc          - Number of shrinkToUses called
   2 regalloc          - Number of cross class joins performed
   2 regalloc          - Number of interval joins performed
   1 shrink-wrap       - Number of functions
   1 sroa              - Maximum number of partitions per alloca
   2 sroa              - Maximum number of uses of a partition
   2 sroa              - Number of alloca partition uses rewritten
   1 sroa              - Number of alloca partitions formed
   1 sroa              - Number of allocas analyzed for replacement
   2 sroa              - Number of instructions deleted
   1 sroa              - Number of allocas promoted to SSA values
   1 stackmaps         - Number of functions skipped
   1 stackmaps         - Number of functions visited
   2 x86-isel          - Number of tail calls
   1 x86-mi-counting   - Number of conditional branch instructions
   3 x86-mi-counting   - Number of machine basic blocks
   1 x86-mi-counting   - Number of machine functions
   5 x86-mi-counting   - Number of machine instructions
   2 x86-mi-counting   - Number of unconditional branch instructions


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D67240

Files:
  llvm/lib/Target/X86/CMakeLists.txt
  llvm/lib/Target/X86/X86.h
  llvm/lib/Target/X86/X86CountMIAnalysis.cpp
  llvm/lib/Target/X86/X86TargetMachine.cpp

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