Index: Analysis/LazyValueAnalysis/lvi-for-ashr.ll =================================================================== --- /dev/null +++ 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 +} Index: Analysis/LazyValueInfo.cpp =================================================================== --- Analysis/LazyValueInfo.cpp +++ Analysis/LazyValueInfo.cpp @@ -1003,6 +1003,7 @@ case Instruction::UDiv: case Instruction::Shl: case Instruction::LShr: + case Instruction::AShr: case Instruction::And: case Instruction::Or: // continue into the code below