[SelectionDAG,GISel] Add `f16` soft promotion for `lrint`, `lround`, `llrint`, and `llround` (#152684)
On platforms that soft promote `half`, using `lrint` intrinsics crashes
with the following:
SoftPromoteHalfOperand Op #0: t5: i32 = lrint t4
LLVM ERROR: Do not know how to soft promote this operator's operand!
PLEASE submit a bug report to
https://github.com/llvm/llvm-project/issues/ and include the crash
backtrace.
Stack dump:
0. Program arguments:
/Users/tmgross/Documents/projects/llvm/llvm-build/bin/llc
-mtriple=riscv32
1. Running pass 'Function Pass Manager' on module '<stdin>'.
2. Running pass 'RISC-V DAG->DAG Pattern Instruction Selection' on
function '@test_lrint_ixx_f16'
Resolve this by adding a soft promotion. GISel is included since tests
cover both.
Fixes crash tests added in
https://github.com/llvm/llvm-project/pull/152662 for targets that use
`softPromoteHalfType`.
Co-authored-by: Folkert de Vries <folkert@folkertdev.nl>
llvm-project
c63d2953 - [SelectionDAG,GISel] Add `f16` soft promotion for `lrint`, `lround`, `llrint`, and `llround` (#152684)
