cmd/compile: output stack map index everywhere it changes
Currently, the code generator only considers outputting stack map
indexes at CALL instructions. Raise this into the code generator loop
itself so that changes in the stack map index at any instruction emit
a PCDATA Prog before the actual instruction.
We'll optimize this in later CLs:
name old time/op new time/op delta
Template 190ms ± 2% 191ms ± 2% ~ (p=0.529 n=10+10)
Unicode 96.4ms ± 1% 98.5ms ± 3% +2.18% (p=0.001 n=9+10)
GoTypes 669ms ± 1% 673ms ± 1% +0.62% (p=0.004 n=9+9)
Compiler 3.18s ± 1% 3.22s ± 1% +1.06% (p=0.000 n=10+9)
SSA 7.59s ± 1% 7.64s ± 1% +0.66% (p=0.023 n=10+10)
Flate 128ms ± 1% 130ms ± 2% +1.07% (p=0.043 n=10+10)
GoParser 157ms ± 2% 158ms ± 3% ~ (p=0.123 n=10+10)
Reflect 442ms ± 1% 445ms ± 1% +0.73% (p=0.017 n=10+9)
Tar 179ms ± 1% 180ms ± 1% +0.58% (p=0.019 n=9+9)
XML 229ms ± 1% 232ms ± 2% +1.27% (p=0.009 n=10+10)
[Geo mean] 401ms 405ms +0.94%
name old exe-bytes new exe-bytes delta
HelloSize 1.46M ± 0% 1.47M ± 0% +0.84% (p=0.000 n=10+10)
[Geo mean] 1.46M 1.47M +0.84%
For #24543.
Change-Id: I4bfe45b767c9d9db47308a27763b303fa75bfa54
Reviewed-on: https://go-review.googlesource.com/109350
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>