Subtract instruction tests.

src/alloy/frontend/ppc/test/instr_subfze.s

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+test_subfze_one_ca_1:
+  #_ REGISTER_IN r10 0x00000000000103BF
+  xor r3, r3, r3
+  not r3, r3
+  addic r3, r3, 1
+  subfze r3, r10
+  adde r4, r0, r0
+  blr
+  #_ REGISTER_OUT r10 0x00000000000103BF
+  #_ REGISTER_OUT r3 0xfffffffffffefc41
+  #_ REGISTER_OUT r4 0
+
+test_subfze_one_ca_2:
+  #_ REGISTER_IN r10 0
+  xor r3, r3, r3
+  not r3, r3
+  addic r3, r3, 1
+  subfze r3, r10
+  adde r4, r0, r0
+  blr
+  #_ REGISTER_OUT r10 0
+  #_ REGISTER_OUT r3 0
+  #_ REGISTER_OUT r4 1
+
+test_subfze_one_ca_3:
+  #_ REGISTER_IN r10 1
+  xor r3, r3, r3
+  not r3, r3
+  addic r3, r3, 1
+  subfze r3, r10
+  adde r4, r0, r0
+  blr
+  #_ REGISTER_OUT r10 1
+  #_ REGISTER_OUT r3 -1
+  #_ REGISTER_OUT r4 0
+
+test_subfze_one_ca_4:
+  #_ REGISTER_IN r10 0xFFFFFFFFFFFFFFFF
+  xor r3, r3, r3
+  not r3, r3
+  addic r3, r3, 1
+  subfze r3, r10
+  adde r4, r0, r0
+  blr
+  #_ REGISTER_OUT r10 0xFFFFFFFFFFFFFFFF
+  #_ REGISTER_OUT r3 0x1
+  #_ REGISTER_OUT r4 0
+
+test_subfze_zero_ca_1:
+  #_ REGISTER_IN r10 0x00000000000103BF
+  xor r3, r3, r3
+  addic r3, r3, 1
+  subfze r3, r10
+  adde r4, r0, r0
+  blr
+  #_ REGISTER_OUT r10 0x00000000000103BF
+  #_ REGISTER_OUT r3 0xfffffffffffefc40
+  #_ REGISTER_OUT r4 0
+
+test_subfze_zero_ca_2:
+  #_ REGISTER_IN r10 0
+  xor r3, r3, r3
+  addic r3, r3, 1
+  subfze r3, r10
+  adde r4, r0, r0
+  blr
+  #_ REGISTER_OUT r10 0
+  #_ REGISTER_OUT r3 0xffffffffffffffff
+  #_ REGISTER_OUT r4 0
+
+test_subfze_zero_ca_3:
+  #_ REGISTER_IN r10 1
+  xor r3, r3, r3
+  addic r3, r3, 1
+  subfze r3, r10
+  adde r4, r0, r0
+  blr
+  #_ REGISTER_OUT r10 1
+  #_ REGISTER_OUT r3 0xfffffffffffffffe
+  #_ REGISTER_OUT r4 0
+
+test_subfze_zero_ca_4:
+  #_ REGISTER_IN r10 0xFFFFFFFFFFFFFFFF
+  xor r3, r3, r3
+  addic r3, r3, 1
+  subfze r3, r10
+  adde r4, r0, r0
+  blr
+  #_ REGISTER_OUT r10 0xFFFFFFFFFFFFFFFF
+  #_ REGISTER_OUT r3 0
+  #_ REGISTER_OUT r4 0