gh-106529: Implement POP_JUMP_IF_XXX uops#106551
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This adds: - Hand-written uops JUMP_IF_{TRUE,FALSE,NONE,NOT_NONE}. These peek at the top of the stack. The jump target (in superblock space) is absolute. - Hand-written translation for POP_JUMP_IF_TRUE, assuming the jump is unlikely. This can serve as an example for the rest. (Probably adding the others will cause a little refactoring.) Once we implement jump-likelihood profiling, we can implement the jump-unlikely case. Note that the stubs are placed at the end of the trace array. There is a gap between the main superblock and the stubs. We could close the gap, we'd just have to patch up the JUMP uops.
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gvanrossum commented Jul 10, 2023
Since we discussed this extensively off-line, I'm going to just merge this once all tests pass. |
This required improving len(ex) and ex[i] a bit. There is now a sentinel opcode (0) at the end, *unless* the trace array is full.
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This adds:
Hand-written uops
_POP_JUMP_IF_{TRUE,FALSE}. These pop the top of the stack. The jump target (in superblock space) is absolute.Hand-written translation for
POP_JUMP_IF_{TRUE,FALSE}, assuming the jump is unlikely. Once we implement jump-likelihood profiling, we can implement the jump-unlikely case.Note that the stubs are placed at the end of the trace array (and not counted in the return value of translate_bytecode_to_trace(), which is a bid dodgy). There is a gap between the main superblock and the stubs. We could close the gap, we'd just have to patch up the JUMP uops.
TODO in this PR:
TODO in a follow-up PR: