1; RUN: opt -indvars -S < %s | FileCheck %s 2 3define void @test0(i32* %x) { 4entry: 5 br label %for.inc 6 7for.inc: ; preds = %for.inc, %entry 8 %i.01 = phi i32 [ 0, %entry ], [ %add, %for.inc ] 9 %and = and i32 %i.01, 3 10 %cmp1 = icmp eq i32 %and, 0 11 %cond = select i1 %cmp1, i32 0, i32 1 12 store i32 %cond, i32* %x, align 4 13 %add = add i32 %i.01, 4 14 %cmp = icmp ult i32 %add, 8 15 br i1 %cmp, label %for.inc, label %for.end 16 17for.end: ; preds = %for.inc 18 ret void 19} 20 21; Should fold the condition of the select into constant 22; CHECK-LABEL: void @test0( 23; CHECK: icmp eq i32 0, 0 24 25define void @test1(i32* %a) { 26entry: 27 br label %for.body 28 29for.body: ; preds = %entry, %for.body 30 %i.01 = phi i32 [ 0, %entry ], [ %inc, %for.body ] 31 %mul = mul nsw i32 %i.01, 64 32 %rem = srem i32 %mul, 8 33 %idxprom = sext i32 %rem to i64 34 %arrayidx = getelementptr inbounds i32, i32* %a, i64 %idxprom 35 store i32 %i.01, i32* %arrayidx, align 4 36 %inc = add nsw i32 %i.01, 1 37 %cmp = icmp slt i32 %inc, 64 38 br i1 %cmp, label %for.body, label %for.end 39 40for.end: ; preds = %for.body 41 ret void 42} 43 44; Should fold the rem since %mul is multiple of 8 45; CHECK-LABEL: @test1( 46; CHECK-NOT: rem 47; CHECK: sext i32 0 to i64 48