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cmd/compile: start on ARM port

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Start working on arm port.  Gets close to correct
code for fibonacci:
    func fib(n int) int {
        if n < 2 {
            return n
        }
        return fib(n-1) + fib(n-2)
    }

Still a lot to do, but this is a good starting point.

Cleaned up some arch-specific dependencies in regalloc.

Change-Id: I4301c6c31a8402168e50dcfee8bcf7aee73ea9d5
Reviewed-on: https://go-review.googlesource.com/21000
Reviewed-by: David Chase <drchase@google.com>
This commit is contained in:
Keith Randall 2016-03-21 22:57:26 -07:00
parent 44d3f89e99
commit 4c9a470d46
13 changed files with 807 additions and 73 deletions
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8
src/cmd/compile/internal/ssa/config.go
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@ -18,6 +18,7 @@ type Config struct {
PtrSize int64 // 4 or 8
lowerBlock func(*Block) bool // lowering function
lowerValue func(*Value, *Config) bool // lowering function
registers []Register // machine registers
fe Frontend // callbacks into compiler frontend
HTML *HTMLWriter // html writer, for debugging
ctxt *obj.Link // Generic arch information
@ -112,11 +113,18 @@ func NewConfig(arch string, fe Frontend, ctxt *obj.Link, optimize bool) *Config
c.PtrSize = 8
c.lowerBlock = rewriteBlockAMD64
c.lowerValue = rewriteValueAMD64
c.registers = registersAMD64[:]
case "386":
c.IntSize = 4
c.PtrSize = 4
c.lowerBlock = rewriteBlockAMD64
c.lowerValue = rewriteValueAMD64 // TODO(khr): full 32-bit support
case "arm":
c.IntSize = 4
c.PtrSize = 4
c.lowerBlock = rewriteBlockARM
c.lowerValue = rewriteValueARM
c.registers = registersARM[:]
default:
fe.Unimplementedf(0, "arch %s not implemented", arch)
}