// Inline the regions from the old while into the new one, and apply
    // signature conversion to inlined region.
    for (auto it : llvm::zip(op.getRegions(), converted.getRegions())) {
      Region &old_region = *std::get<0>(it);
      Region &new_region = *std::get<1>(it);

      Block &entry = old_region.front();
      // Build signature conversion for the region.

	for v.Op == OpOffPtr || v.Op == OpAddPtr {
		v = v.Args[0]
	}
	return v.Op == OpSP || v.Op == OpLocalAddr
}

// disjoint reports whether the memory region specified by [p1:p1+n1)
// does not overlap with [p2:p2+n2).
// A return value of false does not imply the regions overlap.
func disjoint(p1 *Value, n1 int64, p2 *Value, n2 int64) bool {
	if n1 == 0 || n2 == 0 {
		return true
	}
	if p1 == p2 {
		return false
	}

	}
	if err != nil {
		apiErr.Description = fmt.Sprintf("%s (%s)", apiErr.Description, err)
	}
	if region := globalSite.Region(); region != "" {
		if errCode == ErrAuthorizationHeaderMalformed {
			apiErr.Description = fmt.Sprintf("The authorization header is malformed; the region is wrong; expecting '%s'.", region)
			return apiErr
		}
	}
	return apiErr
}

	if accessKeyID == "" || secretAccessKey == "" {
		return errors.New("Presign cannot be generated without access and secret keys")
	}

	region := globalSite.Region()
	date := UTCNow()
	scope := getScope(date, region)
	credential := fmt.Sprintf("%s/%s", accessKeyID, scope)

	// Set URL query.
	query := req.URL.Query()
	query.Set("X-Amz-Algorithm", signV4Algorithm)

	// that match less (or, eventually, none) preferences.
	// For instance, with `[NETWORK, REGION, ZONE]`, we will send to:
	// 1. Endpoints matching `[NETWORK, REGION, ZONE]`
	// 2. Endpoints matching `[NETWORK, REGION]`
	// 3. Endpoints matching `[NETWORK]`
	// 4. Any endpoints
	LoadBalancing_FAILOVER LoadBalancing_Mode = 2
)

		// first non-zero-width op (for other blocks).
		for idx := 0; idx < len(b.Values); idx++ {
			v := b.Values[idx]
			if blockPrologComplete(v) {
				break
			}
			// Consider only "lifetime begins at block start" ops.
			if !mustBeFirst(v) && v.Op != OpArg {
				continue
			}
			slots := state.valueNames[v.ID]
			reg, _ := state.f.getHome(v.ID).(*Register)