[llvm] r210006 - Added inst combine transforms for single bit tests from Chris's note

Dinesh Dwivedi dinesh.d at samsung.com
Mon Jun 2 00:24:37 PDT 2014


Author: dinesh
Date: Mon Jun  2 02:24:36 2014
New Revision: 210006

URL: http://llvm.org/viewvc/llvm-project?rev=210006&view=rev
Log:
Added inst combine transforms for single bit tests from Chris's note

if ((x & C) == 0) x |= C becomes x |= C
if ((x & C) != 0) x ^= C becomes x &= ~C
if ((x & C) == 0) x ^= C becomes x |= C
if ((x & C) != 0) x &= ~C becomes x &= ~C
if ((x & C) == 0) x &= ~C becomes nothing

Differential Revision: http://reviews.llvm.org/D3777


Modified:
    llvm/trunk/lib/Transforms/InstCombine/InstCombineSelect.cpp
    llvm/trunk/test/Transforms/InstCombine/select.ll

Modified: llvm/trunk/lib/Transforms/InstCombine/InstCombineSelect.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/InstCombine/InstCombineSelect.cpp?rev=210006&r1=210005&r2=210006&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/InstCombine/InstCombineSelect.cpp (original)
+++ llvm/trunk/lib/Transforms/InstCombine/InstCombineSelect.cpp Mon Jun  2 02:24:36 2014
@@ -365,7 +365,15 @@ static Value *SimplifyWithOpReplaced(Val
 /// 1. The icmp predicate is inverted
 /// 2. The select operands are reversed
 /// 3. The magnitude of C2 and C1 are flipped
-static Value *foldSelectICmpAndOr(const SelectInst &SI, Value *TrueVal,
+///
+/// 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,
                                   Value *FalseVal,
                                   InstCombiner::BuilderTy *Builder) {
   const ICmpInst *IC = dyn_cast<ICmpInst>(SI.getCondition());
@@ -384,6 +392,25 @@ static Value *foldSelectICmpAndOr(const
     return nullptr;
 
   const APInt *C2;
+  if (match(TrueVal, m_Specific(X))) {
+    // if ((X & C) != 0) X ^= C becomes X &= ~C
+    if (match(FalseVal, m_Xor(m_Specific(X), m_APInt(C2))) && C1 == C2)
+      return Builder->CreateAnd(X, ~(*C1));
+    // if ((X & C) != 0) X &= ~C becomes X &= ~C
+    if (match(FalseVal, m_And(m_Specific(X), m_APInt(C2))) && *C1 == ~(*C2))
+      return FalseVal;
+  } else if (match(FalseVal, m_Specific(X))) {
+    // if ((X & C) == 0) X ^= C becomes X |= C
+    if (match(TrueVal, m_Xor(m_Specific(X), m_APInt(C2))) && C1 == C2)
+      return Builder->CreateOr(X, *C1);
+    // if ((X & C) == 0) X &= ~C becomes nothing
+    if (match(TrueVal, m_And(m_Specific(X), m_APInt(C2))) && *C1 == ~(*C2))
+      return X;
+    // if ((X & C) == 0) X |= C becomes X |= C
+    if (match(TrueVal, m_Or(m_Specific(X), m_APInt(C2))) && C1 == C2)
+      return TrueVal;
+  }
+
   bool OrOnTrueVal = false;
   bool OrOnFalseVal = match(FalseVal, m_Or(m_Specific(TrueVal), m_Power2(C2)));
   if (!OrOnFalseVal)

Modified: llvm/trunk/test/Transforms/InstCombine/select.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/select.ll?rev=210006&r1=210005&r2=210006&view=diff
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/select.ll (original)
+++ llvm/trunk/test/Transforms/InstCombine/select.ll Mon Jun  2 02:24:36 2014
@@ -996,6 +996,111 @@ define <2 x i32> @select_icmp_eq_and_1_0
   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
+}
+
+; CHECK-LABEL: @select_icmp_x_and_8_eq_0_y_xor_8(
+; CHECK: select i1 %cmp, i64 %y, i64 %xor
+define i64 @select_icmp_x_and_8_eq_0_y_xor_8(i32 %x, i64 %y) {
+  %and = and i32 %x, 8
+  %cmp = icmp eq i32 %and, 0
+  %xor = xor i64 %y, 8
+  %y.xor = select i1 %cmp, i64 %y, i64 %xor
+  ret i64 %y.xor
+}
+
+; CHECK-LABEL: @select_icmp_x_and_8_eq_0_y_and_not_8(
+; CHECK: select i1 %cmp, i64 %y, i64 %and1
+define i64 @select_icmp_x_and_8_eq_0_y_and_not_8(i32 %x, i64 %y) {
+  %and = and i32 %x, 8
+  %cmp = icmp eq i32 %and, 0
+  %and1 = and i64 %y, -9
+  %y.and1 = select i1 %cmp, i64 %y, i64 %and1
+  ret i64 %y.and1
+}
+
+; CHECK-LABEL: @select_icmp_x_and_8_ne_0_y_xor_8(
+; CHECK: select i1 %cmp, i64 %xor, i64 %y
+define i64 @select_icmp_x_and_8_ne_0_y_xor_8(i32 %x, i64 %y) {
+  %and = and i32 %x, 8
+  %cmp = icmp eq i32 %and, 0
+  %xor = xor i64 %y, 8
+  %xor.y = select i1 %cmp, i64 %xor, i64 %y
+  ret i64 %xor.y
+}
+
+; CHECK-LABEL: @select_icmp_x_and_8_ne_0_y_and_not_8(
+; CHECK: select i1 %cmp, i64 %and1, i64 %y
+define i64 @select_icmp_x_and_8_ne_0_y_and_not_8(i32 %x, i64 %y) {
+  %and = and i32 %x, 8
+  %cmp = icmp eq i32 %and, 0
+  %and1 = and i64 %y, -9
+  %and1.y = select i1 %cmp, i64 %and1, i64 %y
+  ret i64 %and1.y
+}
+
+; CHECK-LABEL: @select_icmp_x_and_8_ne_0_y_or_8(
+; CHECK: xor i64 %1, 8
+; CHECK: or i64 %2, %y
+define i64 @select_icmp_x_and_8_ne_0_y_or_8(i32 %x, i64 %y) {
+  %and = and i32 %x, 8
+  %cmp = icmp eq i32 %and, 0
+  %or = or i64 %y, 8
+  %or.y = select i1 %cmp, i64 %or, i64 %y
+  ret i64 %or.y
+}
+
 define i32 @test65(i64 %x) {
   %1 = and i64 %x, 16
   %2 = icmp ne i64 %1, 0





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