diff options
Diffstat (limited to 'erts/emulator/beam')
-rw-r--r-- | erts/emulator/beam/macros.tab | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/erts/emulator/beam/macros.tab b/erts/emulator/beam/macros.tab index 6f9b78af6f..0d175a7ec6 100644 --- a/erts/emulator/beam/macros.tab +++ b/erts/emulator/beam/macros.tab @@ -28,9 +28,18 @@ REFRESH_GEN_DEST() { dst_ptr = REG_TARGET_PTR(dst); } +// $Offset is relative to the start of the instruction (not to the +// location of the failure label reference). Since combined +// instructions may increment the instruction pointer (e.g. in +// 'increment') for some of the instructions in the group, we actually +// use a virtual start position common to all instructions in the +// group. To calculate the correct virtual position, we will need to +// add $IP_ADJUSTMENT to the offset. ($IP_ADJUSTMENT will usually be +// zero, except in a few bit syntax instructions.) + SET_I_REL(Offset) { ASSERT(VALID_INSTR(*(I + ($Offset)))); - I += $Offset; + I += $Offset + $IP_ADJUSTMENT; } SET_CP_I_ABS(Target) { |