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Keith Randall 9088c691da cmd/compile: ensure temp register mask isn't empty
We need to avoid nospill registers at this point in regalloc.
Make sure that we don't restrict our register set to avoid registers
desired by other instructions, if the resulting set includes only
nospill registers.

Fixes #57846

Change-Id: I05478e4513c484755dc2e8621d73dac868e45a27
Reviewed-on: https://go-review.googlesource.com/c/go/+/461685
Reviewed-by: Keith Randall <khr@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
2023-01-17 18:21:06 +00:00
.github .github: suggest using private browsing in pkgsite template 2023-01-03 18:52:47 +00:00
api api: promote next to go1.20 2022-12-07 16:56:12 +00:00
doc doc/go1.20: update cryptography release notes 2023-01-17 18:01:38 +00:00
lib/time lib/time: update to 2022g/2022g 2022-12-07 00:25:27 +00:00
misc misc/cgo/testsanitizers: run libfuzzer tests in temp directory 2022-12-28 15:34:23 +00:00
src cmd/compile: ensure temp register mask isn't empty 2023-01-17 18:21:06 +00:00
test cmd/compile: ensure temp register mask isn't empty 2023-01-17 18:21:06 +00:00
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.gitignore internal/buildcfg: move build configuration out of cmd/internal/objabi 2021-04-16 19:20:53 +00:00
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CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
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