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1; RUN: opt -passes=loop-vectorize -force-vector-width=2 -force-vector-interleave=1 -S < %s | FileCheck %s2 3target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"4 5@A = common global [1024 x float] zeroinitializer, align 166@B = common global [1024 x float] zeroinitializer, align 167 8; Make sure we can vectorize in the presence of hoistable conditional loads.9; CHECK-LABEL: @hoist_cond_load(10; CHECK: load <2 x float>11 12define void @hoist_cond_load() {13entry:14 br label %for.body15for.body:16 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %if.end9 ]17 %arrayidx = getelementptr inbounds [1024 x float], ptr @A, i64 0, i64 %indvars.iv18 %arrayidx2 = getelementptr inbounds [1024 x float], ptr @B, i64 0, i64 %indvars.iv19 %0 = load float, ptr %arrayidx2, align 420 %cmp3 = fcmp oeq float %0, 0.000000e+0021 br i1 %cmp3, label %if.end9, label %if.else22 23if.else:24 %1 = load float, ptr %arrayidx, align 425 br label %if.end926 27if.end9:28 %tmp.0 = phi float [ %1, %if.else ], [ 0.000000e+00, %for.body ]29 store float %tmp.0, ptr %arrayidx, align 430 %indvars.iv.next = add i64 %indvars.iv, 131 %lftr.wideiv = trunc i64 %indvars.iv.next to i3232 %exitcond = icmp ne i32 %lftr.wideiv, 102433 br i1 %exitcond, label %for.body, label %for.end34 35for.end:36 ret void37}38 39; However, we can't hoist loads whose address we have not seen unconditionally40; accessed. One wide load is fine, but not the second.41; CHECK-LABEL: @dont_hoist_cond_load(42; CHECK: load <2 x float>43; CHECK-NOT: load <2 x float>44 45define void @dont_hoist_cond_load(ptr %a) {46entry:47 br label %for.body48for.body:49 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %if.end9 ]50 %arrayidx = getelementptr inbounds [1024 x float], ptr %a, i64 0, i64 %indvars.iv51 %arrayidx2 = getelementptr inbounds [1024 x float], ptr @B, i64 0, i64 %indvars.iv52 %0 = load float, ptr %arrayidx2, align 453 %cmp3 = fcmp oeq float %0, 0.000000e+0054 br i1 %cmp3, label %if.end9, label %if.else55 56if.else:57 %1 = load float, ptr %arrayidx, align 458 br label %if.end959 60if.end9:61 %tmp.0 = phi float [ %1, %if.else ], [ 0.000000e+00, %for.body ]62 store float %tmp.0, ptr %arrayidx2, align 463 %indvars.iv.next = add i64 %indvars.iv, 164 %lftr.wideiv = trunc i64 %indvars.iv.next to i3265 %exitcond = icmp ne i32 %lftr.wideiv, 102466 br i1 %exitcond, label %for.body, label %for.end67 68for.end:69 ret void70}71