[PATCH] D40886: [LVI] Support for ashr in LVI

[Max Kazantsev via Phabricator via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rL320983: [LVI] Support for ashr in LVI (authored by mkazantsev, committed by ).

Changed prior to commit:
  https://reviews.llvm.org/D40886?vs=127337&id=127347#toc

Repository:
  rL LLVM

https://reviews.llvm.org/D40886

Files:
  llvm/trunk/lib/Analysis/LazyValueInfo.cpp
  llvm/trunk/test/Analysis/LazyValueAnalysis/lvi-for-ashr.ll


Index: llvm/trunk/lib/Analysis/LazyValueInfo.cpp
===================================================================
--- llvm/trunk/lib/Analysis/LazyValueInfo.cpp
+++ llvm/trunk/lib/Analysis/LazyValueInfo.cpp
@@ -1002,6 +1002,7 @@
   case Instruction::UDiv:
   case Instruction::Shl:
   case Instruction::LShr:
+  case Instruction::AShr:
   case Instruction::And:
   case Instruction::Or:
     // continue into the code below
Index: llvm/trunk/test/Analysis/LazyValueAnalysis/lvi-for-ashr.ll
===================================================================
--- llvm/trunk/test/Analysis/LazyValueAnalysis/lvi-for-ashr.ll
+++ llvm/trunk/test/Analysis/LazyValueAnalysis/lvi-for-ashr.ll
@@ -0,0 +1,27 @@
+; RUN: opt -correlated-propagation -S %s | FileCheck %s
+; CHECK-LABEL: @test-ashr
+; CHECK: bb_then
+; CHECK:  %. = select i1 true, i32 3, i32 2
+define i32 @test-ashr(i32 %c) {
+chk65:
+  %cmp = icmp sgt i32 %c, 65
+  br i1 %cmp, label %return, label %chk0
+
+chk0:
+  %cmp1 = icmp slt i32 %c, 0
+  br i1 %cmp, label %return, label %bb_if
+
+bb_if:
+  %ashr.val = ashr exact i32 %c, 2
+  %cmp2 = icmp sgt i32 %ashr.val, 15
+  br i1 %cmp2, label %bb_then, label %return
+
+bb_then:
+  %cmp3 = icmp eq i32 %ashr.val, 16
+  %. = select i1 %cmp3, i32 3, i32 2
+  br label %return
+
+return:
+  %retval = phi i32 [0, %chk65], [1, %chk0], [%., %bb_then], [4, %bb_if]
+  ret i32 %retval
+}


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