Dmitry Stogov

Use "offset" instead of "index" to access variables in MIR interpreter

2

```asm mov 0x20(%rsi),%rax add $0x30,%rsi shl $0x4,%rax ; this instruction may be eliminated if offset is predcalculated movsd (%rbx,%rax,1),%xmm0 mov -0x20(%rsi),%rax shl $0x4,%rax ; this instruction may be eliminated if...

MIR misses useful "developer" options

1

- built-in disassembler - ability to debug JIT-ed code with GDB (__jit_debug_register_code) - ability to monitor JIT-ed code with sampling profilers (Linux Perf, Oprofile, VTune)

Use movaps instead of movsd on X86_64

2

``movsd `` modifies only a part of %xmm register and therefore slower than ``movaps``. I made the same mistake in PHP JIT, and for years though that AVX code is...

BOLT crashes on HHVM (3.28.0-dev) and PHP (7.*) compiled with GCC 8.1.1

10

$ bin/perf2bolt -p perf.data -o perf.fdata hhvm PERF2BOLT: Starting data aggregation job for perf.data PERF2BOLT: Spawning perf-script job to read branch events PERF2BOLT: Spawning perf-script job to read mem events...