[PATCH] D147406: [LoongArch] Optimize multiplication with immediates

[Ben Shi via Phabricator via llvm-commits]

benshi001 added inline comments.


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Comment at: llvm/test/CodeGen/LoongArch/ir-instruction/mul.ll:1038-1040
+; LA64-NEXT:    slli.d $a1, $a0, 1
+; LA64-NEXT:    slli.d $a0, $a0, 12
+; LA64-NEXT:    add.w $a0, $a0, $a1
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benshi001 wrote:
> xen0n wrote:
> > Kind of interesting why this didn't get optimized into the same form as LA32, but there may be a deeper reason. I don't currently have time to look into this though.
> I will take a look later, however this is still a win, since total 4 instructions are reduced to 3 ones.
Maybe we can accept current form, and I will submit another patch for this further optimization.


Repository:
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  https://reviews.llvm.org/D147406/new/

https://reviews.llvm.org/D147406