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cmd/compile: add SSA backend for s390x and enable by default

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The new SSA backend modifies the ABI slightly: R0 is now a usable
general purpose register.

Fixes #16677.

Change-Id: I367435ce921e0c7e79e021c80cf8ef5d1d1466cf
Reviewed-on: https://go-review.googlesource.com/28978
Run-TryBot: Michael Munday <munday@ca.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Michael Munday 2016-09-12 14:50:10 -04:00
parent b7e53038b8
commit 6ec993adc3
18 changed files with 21271 additions and 22 deletions
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2
src/cmd/compile/internal/ssa/regalloc.go
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@ -502,6 +502,8 @@ func (s *regAllocState) init(f *Func) {
// we do need to be careful, but that carefulness is hidden
// in the rewrite rules so we always have a free register
// available for global load/stores. See gen/386.rules (search for Flag_shared).
case "s390x":
// nothing to do, R10 & R11 already reserved
default:
s.f.Config.fe.Unimplementedf(0, "arch %s not implemented", s.f.Config.arch)
}