https://bugs.llvm.org/show_bug.cgi?id=39865
Bug ID: 39865
Summary: [PowerPC] Support half/f16
Product: new-bugs
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: new bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
I was exploring adding support for half/f16 in the Julia frontend and while
testing on PPC I discovered that the backend doesn't support instructions
targeting f16.
I am in particular interested in f16 support since the codegen of the Julia
front-end does not differentiate between GPU/CPU codegen and I want to target
NVIDIAs native f16 support. It would be absolutely fine if the PPC backend
bails out early and emits library-calls.
I no longer have my particular test-case at hand, but running the fairly
generic X86 testcase yields:
➜ llvm git:(master) llc -mtriple=ppc64le-unknown-linux-gnu
test/CodeGen/X86/half.ll
LLVM ERROR: Cannot select: 0x561ac6ea0158: f32,ch = load<(load 2 from
%ir.addr), anyext from f16> 0x561ac6e408f8, 0x561ac6e9ffb8, undef:i64
0x561ac6e9ffb8: i64,ch = CopyFromReg 0x561ac6e408f8, Register:i64 %0
0x561ac6ea0290: i64 = Register %0
0x561ac6ea0088: i64 = undef
In function: test_extend32
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