[llvm] [DAGCombiner] Attempt to fold 'add' nodes to funnel-shift or rotate (PR #125612)

[Craig Topper via llvm-commits]

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@@ -0,0 +1,118 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc < %s -march=nvptx64 -mcpu=sm_50 | FileCheck %s
+
+target triple = "nvptx64-nvidia-cuda"
+
+define i32 @test_rotl(i32 %x) {
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topperc wrote:

It looks like this test already works? Can you use 2 commits one that adds the test, and one that adds the DAGCombiner.cpp so we can see how the tests change?

https://github.com/llvm/llvm-project/pull/125612