Revert r255691 "[LoopVectorizer] Refine loop vectorizer's register usage calculator by ignoring specific instructions."

It caused PR26509.

llvm-svn: 261368

2 files changed, 1 insertions, 72 deletions

diff --git a/llvm/test/Transforms/LoopVectorize/X86/reg-usage.ll b/llvm/test/Transforms/LoopVectorize/X86/reg-usage.ll
deleted file mode 100644
index 47a6e1029ed..00000000000
--- a/llvm/test/Transforms/LoopVectorize/X86/reg-usage.ll
+++ /dev/null
@@ -1,71 +0,0 @@
-; RUN: opt < %s -debug-only=loop-vectorize -loop-vectorize -vectorizer-maximize-bandwidth -O2 -S 2>&1 | FileCheck %s
-; REQUIRES: asserts
-
-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"
-target triple = "x86_64-unknown-linux-gnu"
-
-@a = global [1024 x i8] zeroinitializer, align 16
-@b = global [1024 x i8] zeroinitializer, align 16
-
-define i32 @foo() {
-; This function has a loop of SAD pattern. Here we check when VF = 16 the
-; register usage doesn't exceed 16.
-;
-; CHECK-LABEL: foo
-; CHECK:      LV(REG): VF = 4
-; CHECK-NEXT: LV(REG): Found max usage: 4
-; CHECK:      LV(REG): VF = 8
-; CHECK-NEXT: LV(REG): Found max usage: 7
-; CHECK:      LV(REG): VF = 16
-; CHECK-NEXT: LV(REG): Found max usage: 13
-
-entry:
-  br label %for.body
-
-for.cond.cleanup:
-  %add.lcssa = phi i32 [ %add, %for.body ]
-  ret i32 %add.lcssa
-
-for.body:
-  %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
-  %s.015 = phi i32 [ 0, %entry ], [ %add, %for.body ]
-  %arrayidx = getelementptr inbounds [1024 x i8], [1024 x i8]* @a, i64 0, i64 %indvars.iv
-  %0 = load i8, i8* %arrayidx, align 1
-  %conv = zext i8 %0 to i32
-  %arrayidx2 = getelementptr inbounds [1024 x i8], [1024 x i8]* @b, i64 0, i64 %indvars.iv
-  %1 = load i8, i8* %arrayidx2, align 1
-  %conv3 = zext i8 %1 to i32
-  %sub = sub nsw i32 %conv, %conv3
-  %ispos = icmp sgt i32 %sub, -1
-  %neg = sub nsw i32 0, %sub
-  %2 = select i1 %ispos, i32 %sub, i32 %neg
-  %add = add nsw i32 %2, %s.015
-  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
-  %exitcond = icmp eq i64 %indvars.iv.next, 1024
-  br i1 %exitcond, label %for.cond.cleanup, label %for.body
-}
-
-define i64 @bar(i64* nocapture %a) {
-; CHECK-LABEL: bar
-; CHECK:       LV(REG): VF = 2
-; CHECK:       LV(REG): Found max usage: 4
-;
-entry:
-  br label %for.body
-
-for.cond.cleanup:
-  %add2.lcssa = phi i64 [ %add2, %for.body ]
-  ret i64 %add2.lcssa
-
-for.body:
-  %i.012 = phi i64 [ 0, %entry ], [ %inc, %for.body ]
-  %s.011 = phi i64 [ 0, %entry ], [ %add2, %for.body ]
-  %arrayidx = getelementptr inbounds i64, i64* %a, i64 %i.012
-  %0 = load i64, i64* %arrayidx, align 8
-  %add = add nsw i64 %0, %i.012
-  store i64 %add, i64* %arrayidx, align 8
-  %add2 = add nsw i64 %add, %s.011
-  %inc = add nuw nsw i64 %i.012, 1
-  %exitcond = icmp eq i64 %inc, 1024
-  br i1 %exitcond, label %for.cond.cleanup, label %for.body
-}
diff --git a/llvm/test/Transforms/LoopVectorize/X86/vector_max_bandwidth.ll b/llvm/test/Transforms/LoopVectorize/X86/vector_max_bandwidth.ll
index fe9d59efc8b..e6dc39c2afa 100644
--- a/llvm/test/Transforms/LoopVectorize/X86/vector_max_bandwidth.ll
+++ b/llvm/test/Transforms/LoopVectorize/X86/vector_max_bandwidth.ll
@@ -16,7 +16,7 @@ target triple = "x86_64-unknown-linux-gnu"
 ; -vectorizer-maximize-bandwidth is indicated.
 ;
 ; CHECK-label: foo
-; CHECK: LV: Selecting VF: 32.
+; CHECK: LV: Selecting VF: 16.
 define void @foo() {
 entry:
   br label %for.body