From: Keith Randall <khr@golang.org>
Date: Mon, 4 Jan 2016 21:34:54 +0000 (-0800)
Subject: [dev.ssa] cmd/compile: zero register masks for each edge
X-Git-Tag: go1.7beta1~1623^2^2~100
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=d7ad7b9efecf034e2d95fe48b455a8dbb2204f2e;p=gostls13.git

[dev.ssa] cmd/compile: zero register masks for each edge

Forgot to reset these masks before each merge edge is processed.

Change-Id: I2f593189b63f50a1cd12b2dd4645ca7b9614f1f3
Reviewed-on: https://go-review.googlesource.com/18223
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
---

diff --git a/src/cmd/compile/internal/ssa/regalloc.go b/src/cmd/compile/internal/ssa/regalloc.go
index 0f1068a337..d7c4674cfd 100644
--- a/src/cmd/compile/internal/ssa/regalloc.go
+++ b/src/cmd/compile/internal/ssa/regalloc.go
@@ -1052,6 +1052,9 @@ func (e *edgeState) setup(idx int, srcReg []endReg, dstReg []startReg, stacklive
 	for k := range e.contents {
 		delete(e.contents, k)
 	}
+	e.usedRegs = 0
+	e.uniqueRegs = 0
+	e.finalRegs = 0
 
 	// Live registers can be sources.
 	for _, x := range srcReg {
@@ -1384,6 +1387,12 @@ func (e *edgeState) findRegFor(typ Type) Location {
 		}
 	}
 
+	fmt.Printf("m:%d unique:%d final:%d\n", m, e.uniqueRegs, e.finalRegs)
+	for vid, a := range e.cache {
+		for _, c := range a {
+			fmt.Printf("v%d: %s %s\n", vid, c, e.s.f.getHome(c.ID).Name())
+		}
+	}
 	e.s.f.Fatalf("can't find empty register on edge %s->%s", e.p, e.b)
 	return nil
 }