[llvm] [AMDGPU] Price only the fmul that fuses into an fadd/fsub as free (PR #226009)

[Gheorghe-Teodor Bercea via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
+; RUN: opt -passes=slp-vectorizer -S -mtriple=amdgcn-amd-amdhsa -mcpu=gfx90a -slp-threshold=1 < %s | FileCheck %s
+; RUN: opt -passes=slp-vectorizer -S -mtriple=amdgcn-amd-amdhsa -mcpu=gfx942 -slp-threshold=1 < %s | FileCheck %s
+; RUN: opt -passes=slp-vectorizer -S -mtriple=amdgcn-amd-amdhsa -mcpu=gfx950 -slp-threshold=1 < %s | FileCheck %s
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doru1004 wrote:

Rewrote the test without the need of a threshold.

https://github.com/llvm/llvm-project/pull/226009