[llvm] [LLVM][SLSR] Add a debug counter (PR #119981)

[Justin Fargnoli via llvm-commits]

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@@ -0,0 +1,30 @@
+; REQUIRES: asserts
+; RUN: opt -passes=slsr,gvn -S -debug-counter=slsr-counter=1  < %s | FileCheck %s
+
+;; Test that, with debug counters on, we will skip the first slsr opportunity.
+
+define void @stride_is_2s(i32 %b, i32 %s) {
+; CHECK-LABEL: @stride_is_2s(
+; CHECK-NEXT:    %s2 = shl i32 %s, 1
+; CHECK-NEXT:    %t1 = add i32 %b, %s2
+; CHECK-NEXT:    call void @foo(i32 %t1)
+; CHECK-NEXT:    %t2 = add i32 %t1, %s2
+; CHECK-NEXT:    call void @foo(i32 %t2)
+; CHECK-NEXT:    %s6 = mul i32 %s, 6
+; CHECK-NEXT:    %t3 = add i32 %b, %s6
+; CHECK-NEXT:    call void @foo(i32 %t3)
+; CHECK-NEXT:    ret void
+;
+  %s2 = shl i32 %s, 1
+  %t1 = add i32 %b, %s2
+  call void @foo(i32 %t1)
+  %s4 = shl i32 %s, 2
+  %t2 = add i32 %b, %s4
+  call void @foo(i32 %t2)
+  %s6 = mul i32 %s, 6
+  %t3 = add i32 %b, %s6
+  call void @foo(i32 %t3)
+  ret void
+}
+
+declare void @foo(i32)
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justinfargnoli wrote:

Add a newline to the end of the file. 

https://github.com/llvm/llvm-project/pull/119981