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; RUN: opt -loop-vectorize -force-vector-width=2 -force-vector-unroll=1 -S < %s | FileCheck %s
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"
@A = common global [1024 x float] zeroinitializer, align 16
@B = common global [1024 x float] zeroinitializer, align 16
; Make sure we can vectorize in the presence of hoistable conditional loads.
; CHECK: hoist_cond_load
; CHECK: load <2 x float>
define void @hoist_cond_load() {
entry:
br label %for.body
for.body:
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %if.end9 ]
%arrayidx = getelementptr inbounds [1024 x float]* @A, i64 0, i64 %indvars.iv
%arrayidx2 = getelementptr inbounds [1024 x float]* @B, i64 0, i64 %indvars.iv
%0 = load float* %arrayidx2, align 4
%cmp3 = fcmp oeq float %0, 0.000000e+00
br i1 %cmp3, label %if.end9, label %if.else
if.else:
%1 = load float* %arrayidx, align 4
br label %if.end9
if.end9:
%tmp.0 = phi float [ %1, %if.else ], [ 0.000000e+00, %for.body ]
store float %tmp.0, float* %arrayidx, align 4
%indvars.iv.next = add i64 %indvars.iv, 1
%lftr.wideiv = trunc i64 %indvars.iv.next to i32
%exitcond = icmp ne i32 %lftr.wideiv, 1024
br i1 %exitcond, label %for.body, label %for.end
for.end:
ret void
}
; However, we can't hoist loads whose address we have not seen unconditionally
; accessed.
; CHECK: dont_hoist_cond_load
; CHECK-NOT: load <2 x float>
define void @dont_hoist_cond_load() {
entry:
br label %for.body
for.body:
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %if.end9 ]
%arrayidx = getelementptr inbounds [1024 x float]* @A, i64 0, i64 %indvars.iv
%arrayidx2 = getelementptr inbounds [1024 x float]* @B, i64 0, i64 %indvars.iv
%0 = load float* %arrayidx2, align 4
%cmp3 = fcmp oeq float %0, 0.000000e+00
br i1 %cmp3, label %if.end9, label %if.else
if.else:
%1 = load float* %arrayidx, align 4
br label %if.end9
if.end9:
%tmp.0 = phi float [ %1, %if.else ], [ 0.000000e+00, %for.body ]
store float %tmp.0, float* %arrayidx2, align 4
%indvars.iv.next = add i64 %indvars.iv, 1
%lftr.wideiv = trunc i64 %indvars.iv.next to i32
%exitcond = icmp ne i32 %lftr.wideiv, 1024
br i1 %exitcond, label %for.body, label %for.end
for.end:
ret void
}
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