diff options
Diffstat (limited to 'lib/Target/ARM/README.txt')
| -rw-r--r-- | lib/Target/ARM/README.txt | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/lib/Target/ARM/README.txt b/lib/Target/ARM/README.txt index 3db8f54..f05ae1c 100644 --- a/lib/Target/ARM/README.txt +++ b/lib/Target/ARM/README.txt @@ -528,3 +528,48 @@ _foo: This apparently occurs in real code. //===---------------------------------------------------------------------===// + +This: + #include <algorithm> + std::pair<unsigned, bool> full_add(unsigned a, unsigned b) + { return std::make_pair(a + b, a + b < a); } + bool no_overflow(unsigned a, unsigned b) + { return !full_add(a, b).second; } + +Should compile to: + +_Z8full_addjj: + adds r2, r1, r2 + movcc r1, #0 + movcs r1, #1 + str r2, [r0, #0] + strb r1, [r0, #4] + mov pc, lr + +_Z11no_overflowjj: + cmn r0, r1 + movcs r0, #0 + movcc r0, #1 + mov pc, lr + +not: + +__Z8full_addjj: + add r3, r2, r1 + str r3, [r0] + mov r2, #1 + mov r12, #0 + cmp r3, r1 + movlo r12, r2 + str r12, [r0, #+4] + bx lr +__Z11no_overflowjj: + add r3, r1, r0 + mov r2, #1 + mov r1, #0 + cmp r3, r0 + movhs r1, r2 + mov r0, r1 + bx lr + +//===---------------------------------------------------------------------===// |