Vikash Gupta fd6f8b3ce3 [AMDGPU] [GlobalIsel] Combine Fmul with Select into ldexp instruction. (#120104) ...

This combine pattern perform the below transformation.

fmul x, select(y, A, B)      -> fldexp (x, select i32 (y, a, b))
fmul x, select(y, -A, -B)   -> fldexp ((fneg x), select i32 (y, a, b))

where, A=2^a & B=2^b ; a and b are integers.

It is a follow-up PR to implement the above combine for globalIsel, as
the corresponding DAG combine has been done for SelectionDAG Isel
(#111109)

2025-01-06 17:42:38 +05:30

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