1 ; RUN: opt -loop-vectorize -force-vector-width=2 -force-vector-unroll=1 -S < %s | FileCheck %s 2 3 target 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 16 6 @B = common global [1024 x float] zeroinitializer, align 16 7 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 12 define void @hoist_cond_load() { 13 entry: 14 br label %for.body 15 for.body: 16 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %if.end9 ] 17 %arrayidx = getelementptr inbounds [1024 x float]* @A, i64 0, i64 %indvars.iv 18 %arrayidx2 = getelementptr inbounds [1024 x float]* @B, i64 0, i64 %indvars.iv 19 %0 = load float* %arrayidx2, align 4 20 %cmp3 = fcmp oeq float %0, 0.000000e+00 21 br i1 %cmp3, label %if.end9, label %if.else 22 23 if.else: 24 %1 = load float* %arrayidx, align 4 25 br label %if.end9 26 27 if.end9: 28 %tmp.0 = phi float [ %1, %if.else ], [ 0.000000e+00, %for.body ] 29 store float %tmp.0, float* %arrayidx, align 4 30 %indvars.iv.next = add i64 %indvars.iv, 1 31 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 32 %exitcond = icmp ne i32 %lftr.wideiv, 1024 33 br i1 %exitcond, label %for.body, label %for.end 34 35 for.end: 36 ret void 37 } 38 39 ; However, we can't hoist loads whose address we have not seen unconditionally 40 ; accessed. 41 ; CHECK-LABEL: @dont_hoist_cond_load( 42 ; CHECK-NOT: load <2 x float> 43 44 define void @dont_hoist_cond_load() { 45 entry: 46 br label %for.body 47 for.body: 48 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %if.end9 ] 49 %arrayidx = getelementptr inbounds [1024 x float]* @A, i64 0, i64 %indvars.iv 50 %arrayidx2 = getelementptr inbounds [1024 x float]* @B, i64 0, i64 %indvars.iv 51 %0 = load float* %arrayidx2, align 4 52 %cmp3 = fcmp oeq float %0, 0.000000e+00 53 br i1 %cmp3, label %if.end9, label %if.else 54 55 if.else: 56 %1 = load float* %arrayidx, align 4 57 br label %if.end9 58 59 if.end9: 60 %tmp.0 = phi float [ %1, %if.else ], [ 0.000000e+00, %for.body ] 61 store float %tmp.0, float* %arrayidx2, align 4 62 %indvars.iv.next = add i64 %indvars.iv, 1 63 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 64 %exitcond = icmp ne i32 %lftr.wideiv, 1024 65 br i1 %exitcond, label %for.body, label %for.end 66 67 for.end: 68 ret void 69 } 70
