Disassembly of section .text:

0000000000100000 <test_subf_1>:
  100000:       7c 6a 58 50     subf    r3,r10,r11
  100004:       4e 80 00 20     blr

0000000000100008 <test_subf_1_constant>:
  100008:       3d 40 00 01     lis     r10,1
  10000c:       61 4a 03 bf     ori     r10,r10,959
  100010:       3d 60 00 01     lis     r11,1
  100014:       61 6b 03 c0     ori     r11,r11,960
  100018:       7c 6a 58 50     subf    r3,r10,r11
  10001c:       4e 80 00 20     blr

0000000000100020 <test_subf_2>:
  100020:       7c 6a 58 50     subf    r3,r10,r11
  100024:       4e 80 00 20     blr

0000000000100028 <test_subf_2_constant>:
  100028:       39 40 00 00     li      r10,0
  10002c:       39 60 00 00     li      r11,0
  100030:       7c 6a 58 50     subf    r3,r10,r11
  100034:       4e 80 00 20     blr

0000000000100038 <test_subf_3>:
  100038:       7c 6a 58 50     subf    r3,r10,r11
  10003c:       4e 80 00 20     blr

0000000000100040 <test_subf_3_constant>:
  100040:       39 40 00 01     li      r10,1
  100044:       39 60 00 00     li      r11,0
  100048:       7c 6a 58 50     subf    r3,r10,r11
  10004c:       4e 80 00 20     blr

0000000000100050 <test_subf_4>:
  100050:       7c 6a 58 50     subf    r3,r10,r11
  100054:       4e 80 00 20     blr

0000000000100058 <test_subf_4_constant>:
  100058:       39 40 00 00     li      r10,0
  10005c:       39 60 00 01     li      r11,1
  100060:       7c 6a 58 50     subf    r3,r10,r11
  100064:       4e 80 00 20     blr

0000000000100068 <test_subf_5>:
  100068:       7c 6a 58 50     subf    r3,r10,r11
  10006c:       4e 80 00 20     blr

0000000000100070 <test_subf_5_constant>:
  100070:       39 40 ff ff     li      r10,-1
  100074:       39 60 ff ff     li      r11,-1
  100078:       7c 6a 58 50     subf    r3,r10,r11
  10007c:       4e 80 00 20     blr