[llvm] [AMDGPU] Preserve exact flag for lshr (PR #146744)

[via llvm-commits]

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@@ -0,0 +1,41 @@
+; NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 5
+; RUN: llc -mtriple=amdgcn-amd-amdhsa -mcpu=gfx900 -stop-after=finalize-isel -o - %s | FileCheck %s
+
+;; Test that reduction of:
+;;
+;;   DST = lshr i64 X, Y
+;;
+;; where Y is in the range [63-32] to:
+;;
+;;   DST = [srl i32 X, (Y & 0x1F), 0]
+;;
+;; preserves flags
+
+define i64 @srl_exact(i64 %arg0, i64 %shift_amt) {
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LU-JOHN wrote:

Test pre-committed in https://github.com/llvm/llvm-project/pull/146747

https://github.com/llvm/llvm-project/pull/146744