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      1 // Copyright 2017 The Go Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 package main
      6 
      7 import (
      8 	"globallib"
      9 )
     10 
     11 //go:noinline
     12 func testLoop() {
     13 	for i, s := range globallib.Data {
     14 		if s != int64(i) {
     15 			panic("testLoop: mismatch")
     16 		}
     17 	}
     18 }
     19 
     20 //go:noinline
     21 func ptrData() *[1<<20 + 10]int64 {
     22 	return &globallib.Data
     23 }
     24 
     25 //go:noinline
     26 func testMediumOffset() {
     27 	for i, s := range globallib.Data[1<<16-2:] {
     28 		if s != int64(i)+1<<16-2 {
     29 			panic("testMediumOffset: index mismatch")
     30 		}
     31 	}
     32 
     33 	x := globallib.Data[1<<16-1]
     34 	if x != 1<<16-1 {
     35 		panic("testMediumOffset: direct mismatch")
     36 	}
     37 
     38 	y := &globallib.Data[1<<16-3]
     39 	if y != &ptrData()[1<<16-3] {
     40 		panic("testMediumOffset: address mismatch")
     41 	}
     42 }
     43 
     44 //go:noinline
     45 func testLargeOffset() {
     46 	for i, s := range globallib.Data[1<<20:] {
     47 		if s != int64(i)+1<<20 {
     48 			panic("testLargeOffset: index mismatch")
     49 		}
     50 	}
     51 
     52 	x := globallib.Data[1<<20+1]
     53 	if x != 1<<20+1 {
     54 		panic("testLargeOffset: direct mismatch")
     55 	}
     56 
     57 	y := &globallib.Data[1<<20+2]
     58 	if y != &ptrData()[1<<20+2] {
     59 		panic("testLargeOffset: address mismatch")
     60 	}
     61 }
     62 
     63 func main() {
     64 	testLoop()
     65 
     66 	// SSA rules commonly merge offsets into addresses. These
     67 	// tests access global data in different ways to try
     68 	// and exercise different SSA rules.
     69 	testMediumOffset()
     70 	testLargeOffset()
     71 }
     72