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[dev.ssa] cmd/internal/gc: convert standard IR into SSA.

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Hook into the current compiler to convert the existing
IR (after walk) into SSA.  Any function ending in "_ssa"
will take this path.  The resulting assembly is printed
and then discarded.

Use gc.Type directly in ssa instead of a wrapper for go types.
It makes the IR->SSA rewrite a lot simpler.

Only a few opcodes are implemented in this change.  It is
enough to compile simple examples like
    func f(p *int) int { return *p }
    func g(a []int, i int) int { return a[i] }

Change-Id: I5e18841b752a83ca0519aa1b2d36ef02ce1de6f9
Reviewed-on: https://go-review.googlesource.com/8971
Reviewed-by: Alan Donovan <adonovan@google.com>
This commit is contained in:
Keith Randall 2015-04-15 15:51:25 -07:00
parent 2f09b599c3
commit d2fd43aa77
28 changed files with 1472 additions and 791 deletions
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6
src/cmd/internal/ssa/deadcode_test.go
View file

@ -27,7 +27,7 @@ func TestDeadLoop(t *testing.T) {
addEdge(deadblock, exit)
// dead value in dead block
deadval := deadblock.NewValue(OpConstBool, TypeBool, true)
deadval := deadblock.NewValue(OpConst, TypeBool, true)
deadblock.Control = deadval
CheckFunc(f)
@ -55,7 +55,7 @@ func TestDeadValue(t *testing.T) {
mem := entry.NewValue(OpArg, TypeMem, ".mem")
exit.Control = mem
deadval := entry.NewValue(OpConstInt, TypeInt, 37)
deadval := entry.NewValue(OpConst, TypeInt64, int64(37))
CheckFunc(f)
Deadcode(f)
@ -84,7 +84,7 @@ func TestNeverTaken(t *testing.T) {
mem := entry.NewValue(OpArg, TypeMem, ".mem")
exit.Control = mem
cond := entry.NewValue(OpConstBool, TypeBool, false)
cond := entry.NewValue(OpConst, TypeBool, false)
entry.Control = cond
CheckFunc(f)