• Matthew Dempsky's avatar
    cmd/compile, runtime: simplify multiway select implementation · c310c688
    Matthew Dempsky authored
    This commit reworks multiway select statements to use normal control
    flow primitives instead of the previous setjmp/longjmp-like behavior.
    This simplifies liveness analysis and should prevent issues around
    "returns twice" function calls within SSA passes.
    
    test/live.go is updated because liveness analysis's CFG is more
    representative of actual control flow. The case bodies are the only
    real successors of the selectgo call, but previously the selectsend,
    selectrecv, etc. calls were included in the successors list too.
    
    Updates #19331.
    
    Change-Id: I7f879b103a4b85e62fc36a270d812f54c0aa3e83
    Reviewed-on: https://go-review.googlesource.com/37661
    Run-TryBot: Matthew Dempsky <mdempsky@google.com>
    TryBot-Result: Gobot Gobot <gobot@golang.org>
    Reviewed-by: 's avatarKeith Randall <khr@golang.org>
    c310c688
asm_amd64.s 47.8 KB