diff options
Diffstat (limited to 'llvm/lib/Target/ARM/README.txt')
| -rw-r--r-- | llvm/lib/Target/ARM/README.txt | 16 |
1 files changed, 0 insertions, 16 deletions
diff --git a/llvm/lib/Target/ARM/README.txt b/llvm/lib/Target/ARM/README.txt index def67cfae727..ff84e07fa084 100644 --- a/llvm/lib/Target/ARM/README.txt +++ b/llvm/lib/Target/ARM/README.txt @@ -697,22 +697,6 @@ target-neutral one. //===---------------------------------------------------------------------===// -Optimize unnecessary checks for zero with __builtin_clz/ctz. Those builtins -are specified to be undefined at zero, so portable code must check for zero -and handle it as a special case. That is unnecessary on ARM where those -operations are implemented in a way that is well-defined for zero. For -example: - -int f(int x) { return x ? __builtin_clz(x) : sizeof(int)*8; } - -should just be implemented with a CLZ instruction. Since there are other -targets, e.g., PPC, that share this behavior, it would be best to implement -this in a target-independent way: we should probably fold that (when using -"undefined at zero" semantics) to set the "defined at zero" bit and have -the code generator expand out the right code. - -//===---------------------------------------------------------------------===// - Clean up the test/MC/ARM files to have more robust register choices. R0 should not be used as a register operand in the assembler tests as it's then |