[all-commits] [llvm/llvm-project] 45b149: [PowerPC] Respect endianness when bitcasting to fp...

[Tim Gymnich via All-commits]

  Branch: refs/heads/release/19.x
  Home:   https://github.com/llvm/llvm-project
  Commit: 45b149d2531948d2cc0e9d699a8e5371360a3bdf
      https://github.com/llvm/llvm-project/commit/45b149d2531948d2cc0e9d699a8e5371360a3bdf
  Author: Tim Gymnich <tgymnich at icloud.com>
  Date:   2024-09-01 (Sun, 01 Sep 2024)

  Changed paths:
    M llvm/lib/Target/PowerPC/PPCISelLowering.cpp
    M llvm/test/CodeGen/PowerPC/f128-aggregates.ll

  Log Message:
  -----------
  [PowerPC] Respect endianness when bitcasting to fp128 (#95931)

Fixes #92246

Match the behaviour of `bitcast v2i64 (BUILD_PAIR %lo %hi)` when
encountering `bitcast fp128 (BUILD_PAIR %lo $hi)`.
by inserting a missing swap of the arguments based on endianness.

### Current behaviour:
**fp128**
bitcast fp128 (BUILD_PAIR %lo $hi) => BUILD_FP128 %lo %hi
BUILD_FP128 %lo %hi => MTVSRDD %hi %lo

**v2i64**
bitcast v2i64 (BUILD_PAIR %lo %hi) => BUILD_VECTOR %hi %lo
BUILD_VECTOR %hi %lo => MTVSRDD %lo %hi

(cherry picked from commit 408d82d352eb98e2d0a804c66d359cd7a49228fe)



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