From 0d5742fc595012a306c3a46a95c9600008c14dff Mon Sep 17 00:00:00 2001
From: Dinesh Dwivedi <dinesh.d@samsung.com>
Date: Thu, 15 May 2014 08:22:55 +0000
Subject: [PATCH] Reverting r208848, reason: build failure:
 sanitizer-x86_64-linux-bootstrap/builds/3399

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208852 91177308-0d34-0410-b5e6-96231b3b80d8
---
 .../InstCombine/InstCombineSelect.cpp         | 42 ++-------------
 test/Transforms/InstCombine/select.ll         | 54 -------------------
 2 files changed, 5 insertions(+), 91 deletions(-)

diff --git a/lib/Transforms/InstCombine/InstCombineSelect.cpp b/lib/Transforms/InstCombine/InstCombineSelect.cpp
index 90525950ea6..98260b05992 100644
--- a/lib/Transforms/InstCombine/InstCombineSelect.cpp
+++ b/lib/Transforms/InstCombine/InstCombineSelect.cpp
@@ -365,15 +365,7 @@ static Value *SimplifyWithOpReplaced(Value *V, Value *Op, Value *RepOp,
 /// 1. The icmp predicate is inverted
 /// 2. The select operands are reversed
 /// 3. The magnitude of C2 and C1 are flipped
-///
-/// This also tries to turn
-/// --- Single bit tests:
-/// if ((x & C) == 0) x |= C	to  x |= C
-/// if ((x & C) != 0) x ^= C	to  x &= ~C
-/// if ((x & C) == 0) x ^= C	to  x |= C
-/// if ((x & C) != 0) x &= ~C	to  x &= ~C
-/// if ((x & C) == 0) x &= ~C	to  nothing
-static Value *foldSelectICmpAndOr(SelectInst &SI, Value *TrueVal,
+static Value *foldSelectICmpAndOr(const SelectInst &SI, Value *TrueVal,
                                   Value *FalseVal,
                                   InstCombiner::BuilderTy *Builder) {
   const ICmpInst *IC = dyn_cast<ICmpInst>(SI.getCondition());
@@ -392,34 +384,10 @@ static Value *foldSelectICmpAndOr(SelectInst &SI, Value *TrueVal,
     return nullptr;
 
   const APInt *C2;
-
-  // if ((x & C) != 0) x ^= C becomes x &= ~C
-  if (match(FalseVal, m_Xor(m_Specific(TrueVal), m_APInt(C2))) && C1 == C2) {
-    return Builder->CreateAnd(TrueVal, ~(*C1));
-  }
-
-  // if ((x & C) == 0) x ^= C becomes x |= C
-  if (match(TrueVal, m_Xor(m_Specific(FalseVal), m_APInt(C2))) && C1 == C2) {
-    return Builder->CreateOr(FalseVal, *C1);
-  }
-
-  // if ((x & C) != 0) x &= ~C	becomes x &= ~C
-  // if ((x & C) == 0) x &= ~C	becomes	nothing
-  if ((match(FalseVal, m_And(m_Specific(TrueVal), m_APInt(C2))) ||
-       match(TrueVal, m_And(m_Specific(FalseVal), m_APInt(C2)))) &&
-      *C1 == ~(*C2)) {
-    return FalseVal;
-  }
-
-  bool OrOnFalseVal = false;
-  bool OrOnTrueVal = match(TrueVal, m_Or(m_Specific(FalseVal), m_Power2(C2)));
-
-  // if ((x & C) == 0) x |= C becomes x |= C
-  if (OrOnTrueVal && C1 == C2)
-    return TrueVal;
-
-  if (!OrOnTrueVal)
-    OrOnFalseVal = match(FalseVal, m_Or(m_Specific(TrueVal), m_Power2(C2)));
+  bool OrOnTrueVal = false;
+  bool OrOnFalseVal = match(FalseVal, m_Or(m_Specific(TrueVal), m_Power2(C2)));
+  if (!OrOnFalseVal)
+    OrOnTrueVal = match(TrueVal, m_Or(m_Specific(FalseVal), m_Power2(C2)));
 
   if (!OrOnFalseVal && !OrOnTrueVal)
     return nullptr;
diff --git a/test/Transforms/InstCombine/select.ll b/test/Transforms/InstCombine/select.ll
index b236c525a8f..bbb2792eef9 100644
--- a/test/Transforms/InstCombine/select.ll
+++ b/test/Transforms/InstCombine/select.ll
@@ -996,60 +996,6 @@ define <2 x i32> @select_icmp_eq_and_1_0_or_vector_of_2s(i32 %x, <2 x i32> %y) {
   ret <2 x i32> %select
 }
 
-; CHECK-LABEL: @select_icmp_and_8_eq_0_or_8(
-; CHECK-NEXT: [[OR:%[a-z0-9]+]] = or i32 %x, 8
-; CHECK-NEXT: ret i32 [[OR]]
-define i32 @select_icmp_and_8_eq_0_or_8(i32 %x) {
-  %and = and i32 %x, 8
-  %cmp = icmp eq i32 %and, 0
-  %or = or i32 %x, 8
-  %or.x = select i1 %cmp, i32 %or, i32 %x
-  ret i32 %or.x
-}
-
-; CHECK-LABEL: @select_icmp_and_8_ne_0_xor_8(
-; CHECK-NEXT: [[AND:%[a-z0-9]+]] = and i32 %x, -9
-; CHECK-NEXT: ret i32 [[AND]]
-define i32 @select_icmp_and_8_ne_0_xor_8(i32 %x) {
-  %and = and i32 %x, 8
-  %cmp = icmp eq i32 %and, 0
-  %xor = xor i32 %x, 8
-  %x.xor = select i1 %cmp, i32 %x, i32 %xor
-  ret i32 %x.xor
-}
-
-; CHECK-LABEL: @select_icmp_and_8_eq_0_xor_8(
-; CHECK-NEXT: [[OR:%[a-z0-9]+]] = or i32 %x, 8
-; CHECK-NEXT: ret i32 [[OR]]
-define i32 @select_icmp_and_8_eq_0_xor_8(i32 %x) {
-  %and = and i32 %x, 8
-  %cmp = icmp eq i32 %and, 0
-  %xor = xor i32 %x, 8
-  %xor.x = select i1 %cmp, i32 %xor, i32 %x
-  ret i32 %xor.x
-}
-
-; CHECK-LABEL: @select_icmp_and_8_ne_0_and_not_8(
-; CHECK-NEXT: [[AND:%[a-z0-9]+]] = and i32 %x, -9
-; CHECK-NEXT: ret i32 [[AND]]
-define i32 @select_icmp_and_8_ne_0_and_not_8(i32 %x) {
-  %and = and i32 %x, 8
-  %cmp = icmp eq i32 %and, 0
-  %and1 = and i32 %x, -9
-  %x.and1 = select i1 %cmp, i32 %x, i32 %and1
-  ret i32 %x.and1
-}
-
-; CHECK-LABEL: @select_icmp_and_8_eq_0_and_not_8(
-; CHECK-NEXT: ret i32 %x
-define i32 @select_icmp_and_8_eq_0_and_not_8(i32 %x) {
-  %and = and i32 %x, 8
-  %cmp = icmp eq i32 %and, 0
-  %and1 = and i32 %x, -9
-  %and1.x = select i1 %cmp, i32 %and1, i32 %x
-  ret i32 %and1.x
-}
-
 define i32 @test65(i64 %x) {
   %1 = and i64 %x, 16
   %2 = icmp ne i64 %1, 0