cmd/internal/gc: simplify some indexing

Change-Id: I7d289c7f250e4db551192d52535a90974685f0b3
Reviewed-on: https://go-review.googlesource.com/6891
Reviewed-by: Minux Ma <minux@golang.org>

diff --git a/src/cmd/internal/gc/reg.go b/src/cmd/internal/gc/reg.go
index b4e8cb8e3f60c904bc0465f8b79fe41dc6d6a5a5..9b4645223c55adce01a7f4f86855a5371565c922 100644 (file)
--- a/src/cmd/internal/gc/reg.go
+++ b/src/cmd/internal/gc/reg.go
@@ -81,7 +81,7 @@ func setaddrs(bit Bits) {
 
                // disable all pieces of that variable
                for i = 0; i < nvar; i++ {
-                       v = &var_[i:][0]
+                       v = &var_[i]
                        if v.node == node && int(v.name) == n {
                                v.addr = 2
                        }
@@ -135,7 +135,7 @@ func addmove(r *Flow, bn int, rn int, f int) {
        p.Link = p1
        p1.Lineno = p.Lineno
 
-       v := &var_[bn:][0]
+       v := &var_[bn]
 
        a := &p1.To
        a.Offset = v.offset
@@ -265,7 +265,7 @@ func mkvar(f *Flow, a *obj.Addr) Bits {
        flag := 0
        var v *Var
        for i := 0; i < nvar; i++ {
-               v = &var_[i:][0]
+               v = &var_[i]
                if v.node == node && int(v.name) == n {
                        if v.offset == o {
                                if int(v.etype) == et {
@@ -305,7 +305,7 @@ func mkvar(f *Flow, a *obj.Addr) Bits {
                // a variable but not all of it.
                var v *Var
                for i := 0; i < nvar; i++ {
-                       v = &var_[i:][0]
+                       v = &var_[i]
                        if v.node == node {
                                v.addr = 1
                        }
@@ -316,7 +316,7 @@ func mkvar(f *Flow, a *obj.Addr) Bits {
 
        i := nvar
        nvar++
-       v = &var_[i:][0]
+       v = &var_[i]
        v.id = i
        v.offset = o
        v.name = int8(n)
@@ -457,7 +457,7 @@ func prop(f *Flow, ref Bits, cal Bits) {
                                        if z*64+i >= nvar || (cal.b[z]>>uint(i))&1 == 0 {
                                                continue
                                        }
-                                       v = &var_[z*64+i:][0]
+                                       v = &var_[z*64+i]
                                        if v.node.Opt == nil { // v represents fixed register, not Go variable
                                                continue
                                        }
@@ -546,7 +546,7 @@ func synch(f *Flow, dif Bits) {
 }
 
 func allreg(b uint64, r *Rgn) uint64 {
-       v := &var_[r.varno:][0]
+       v := &var_[r.varno]
        r.regno = 0
        switch v.etype {
        default:
@@ -1043,7 +1043,7 @@ func regopt(firstp *obj.Prog) {
        }
 
        for i := 0; i < nvar; i++ {
-               v := &var_[i:][0]
+               v := &var_[i]
                if v.addr != 0 {
                        bit = blsh(uint(i))
                        for z = 0; z < BITS; z++ {
@@ -1271,7 +1271,7 @@ brk:
                vreg = allreg(usedreg, rgp)
                if rgp.regno != 0 {
                        if Debug['R'] != 0 && Debug['v'] != 0 {
-                               v := &var_[rgp.varno:][0]
+                               v := &var_[rgp.varno]
                                fmt.Printf("registerize %v+%d (bit=%2d et=%v) in %v usedreg=%#x vreg=%#x\n", Nconv(v.node, 0), v.offset, rgp.varno, Econv(int(v.etype), 0), obj.Rconv(int(rgp.regno)), usedreg, vreg)
                        }