issue66066.go

     1  // run
     2  
     3  // Copyright 2024 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  package main
     8  
     9  import "fmt"
    10  
    11  func main() {
    12  	testMod()
    13  	testMul()
    14  }
    15  
    16  //go:noinline
    17  func mod3(x uint32) uint64 {
    18  	return uint64(x % 3)
    19  }
    20  
    21  func testMod() {
    22  	got := mod3(1<<32 - 1)
    23  	want := uint64((1<<32 - 1) % 3)
    24  	if got != want {
    25  		fmt.Printf("testMod: got %x want %x\n", got, want)
    26  	}
    27  
    28  }
    29  
    30  //go:noinline
    31  func mul3(a uint32) uint64 {
    32  	return uint64(a * 3)
    33  }
    34  
    35  func testMul() {
    36  	got := mul3(1<<32 - 1)
    37  	want := uint64((1<<32-1)*3 - 2<<32)
    38  	if got != want {
    39  		fmt.Printf("testMul: got %x want %x\n", got, want)
    40  	}
    41  }
    42
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