From 3f532e0524875c795d849bba69f890abf775a5b6 Mon Sep 17 00:00:00 2001
From: Philip Reames <preames@rivosinc.com>
Date: Mon, 31 Oct 2022 11:54:37 -0700
Subject: [PATCH] [test] Add coverage for sign bits and known non-zero for
 scalable vectors

---
 llvm/test/Transforms/InstCombine/select.ll | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/llvm/test/Transforms/InstCombine/select.ll b/llvm/test/Transforms/InstCombine/select.ll
index 03d3f23..cc72e35 100644
--- a/llvm/test/Transforms/InstCombine/select.ll
+++ b/llvm/test/Transforms/InstCombine/select.ll
@@ -3408,3 +3408,29 @@ define <vscale x 2 x i32> @and_constant_select_svec(<vscale x 2 x i32> %x, <vsca
   %b = select <vscale x 2 x i1> %cond, <vscale x 2 x i32> %a, <vscale x 2 x i32> %x
   ret <vscale x 2 x i32> %b
 }
+
+; TODO: shl should be nsw
+define <vscale x 2 x i32> @scalable_sign_bits(<vscale x 2 x i8> %x) {
+; CHECK-LABEL: @scalable_sign_bits(
+; CHECK-NEXT:    [[A:%.*]] = sext <vscale x 2 x i8> [[X:%.*]] to <vscale x 2 x i32>
+; CHECK-NEXT:    [[B:%.*]] = shl <vscale x 2 x i32> [[A]], shufflevector (<vscale x 2 x i32> insertelement (<vscale x 2 x i32> poison, i32 16, i32 0), <vscale x 2 x i32> poison, <vscale x 2 x i32> zeroinitializer)
+; CHECK-NEXT:    ret <vscale x 2 x i32> [[B]]
+;
+  %a = sext <vscale x 2 x i8> %x to <vscale x 2 x i32>
+  %b = shl <vscale x 2 x i32> %a, shufflevector (<vscale x 2 x i32> insertelement (<vscale x 2 x i32> poison, i32 16, i32 0), <vscale x 2 x i32> poison, <vscale x 2 x i32> zeroinitializer)
+  ret <vscale x 2 x i32> %b
+}
+
+; TODO: can use ult
+define <vscale x 2 x i1> @scalable_non_zero(<vscale x 2 x i32> %x) {
+; CHECK-LABEL: @scalable_non_zero(
+; CHECK-NEXT:    [[A:%.*]] = or <vscale x 2 x i32> [[X:%.*]], shufflevector (<vscale x 2 x i32> insertelement (<vscale x 2 x i32> poison, i32 1, i32 0), <vscale x 2 x i32> poison, <vscale x 2 x i32> zeroinitializer)
+; CHECK-NEXT:    [[B:%.*]] = add nsw <vscale x 2 x i32> [[A]], shufflevector (<vscale x 2 x i32> insertelement (<vscale x 2 x i32> poison, i32 -1, i32 0), <vscale x 2 x i32> poison, <vscale x 2 x i32> zeroinitializer)
+; CHECK-NEXT:    [[CMP:%.*]] = icmp ult <vscale x 2 x i32> [[B]], shufflevector (<vscale x 2 x i32> insertelement (<vscale x 2 x i32> poison, i32 56, i32 0), <vscale x 2 x i32> poison, <vscale x 2 x i32> zeroinitializer)
+; CHECK-NEXT:    ret <vscale x 2 x i1> [[CMP]]
+;
+  %a = or <vscale x 2 x i32> %x, shufflevector (<vscale x 2 x i32> insertelement (<vscale x 2 x i32> poison, i32 1, i32 0), <vscale x 2 x i32> poison, <vscale x 2 x i32> zeroinitializer)
+  %b = add <vscale x 2 x i32> %a, shufflevector (<vscale x 2 x i32> insertelement (<vscale x 2 x i32> poison, i32 -1, i32 0), <vscale x 2 x i32> poison, <vscale x 2 x i32> zeroinitializer)
+  %cmp = icmp ult <vscale x 2 x i32> %b, shufflevector (<vscale x 2 x i32> insertelement (<vscale x 2 x i32> poison, i32 56, i32 0), <vscale x 2 x i32> poison, <vscale x 2 x i32> zeroinitializer)
+  ret <vscale x 2 x i1> %cmp
+}
-- 
2.7.4