Inputs to crnor can come from operands with chains so
if it is being used simply to negate such an operand,
the repeated input cannot be CSE'd. This patch just
adds a code-gen only instruction for this that takes
a single input and duplicates it in the encoding of
the underlying crnor.
Differential revision: https://reviews.llvm.org/D133577
This patch implements the following floating point negative absolute value
builtins that required for compatibility with the XL compiler:
```
double __fnabs(double);
float __fnabss(float);
```
These builtins will emit :
- fnabs on PWR6 and below, or if VSX is disabled.
- xsnabsdp on PWR7 and above, if VSX is enabled.
Differential Revision: https://reviews.llvm.org/D125506
Implement 'back-to-back' FX fusion according to Power10 User Manual
'19.1.5.4 Fusion', not enabled by default.
Reviewed By: nemanjai
Differential Revision: https://reviews.llvm.org/D114345
