566e72d0ce
Constant evaluation provides some rudimentary knowledge of dead code at inlining decision time. Use it. This CL addresses only dead code inside if statements. For statements are never inlined anyway, and dead code inside for statements is rare. Analyzing switch statements is worth doing, but it is more complicated, since we would have to evaluate each case; leave it for later. Fixes #9274 After this CL, the following functions in std+cmd can be newly inlined: cmd/internal/obj/x86/asm6.go:3122: can inline subreg cmd/vendor/golang.org/x/arch/x86/x86asm/decode.go:172: can inline instPrefix cmd/vendor/golang.org/x/arch/x86/x86asm/decode.go:202: can inline truncated go/constant/value.go:234: can inline makeFloat go/types/labels.go:52: can inline (*block).insert math/big/float.go:231: can inline (*Float).Sign math/bits/bits.go:57: can inline OnesCount net/http/server.go:597: can inline (*Server).newConn runtime/hashmap.go:1165: can inline reflect_maplen runtime/proc.go:207: can inline os_beforeExit runtime/signal_unix.go:55: can inline init.5 runtime/stack.go:1081: can inline gostartcallfn Change-Id: I4c92fb96aa0c3d33df7b3f2da548612e79b56b5b Reviewed-on: https://go-review.googlesource.com/37499 Reviewed-by: Matthew Dempsky <mdempsky@google.com> |
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