Revert "Temporarily Revert "Add basic loop fusion pass.""
The reversion apparently deleted the test/Transforms directory.
Will be re-reverting again.
llvm-svn: 358552
diff --git a/llvm/test/Transforms/LoopVectorize/hoist-loads.ll b/llvm/test/Transforms/LoopVectorize/hoist-loads.ll
new file mode 100644
index 0000000..db4774d
--- /dev/null
+++ b/llvm/test/Transforms/LoopVectorize/hoist-loads.ll
@@ -0,0 +1,70 @@
+; RUN: opt -loop-vectorize -force-vector-width=2 -force-vector-interleave=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-LABEL: @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], [1024 x float]* @A, i64 0, i64 %indvars.iv
+ %arrayidx2 = getelementptr inbounds [1024 x float], [1024 x float]* @B, i64 0, i64 %indvars.iv
+ %0 = load float, 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, 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. One wide load is fine, but not the second.
+; CHECK-LABEL: @dont_hoist_cond_load(
+; CHECK: load <2 x float>
+; 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], [1024 x float]* @A, i64 0, i64 %indvars.iv
+ %arrayidx2 = getelementptr inbounds [1024 x float], [1024 x float]* @B, i64 0, i64 %indvars.iv
+ %0 = load float, 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, 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
+}