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