[llvm-commits] [llvm] r108614 - in /llvm/trunk: lib/Transforms/InstCombine/InstCombineAndOrXor.cpp test/Transforms/InstCombine/bit-checks.ll

[Owen Anderson]

Author: resistor
Date: Sat Jul 17 01:56:35 2010
New Revision: 108614

URL: http://llvm.org/viewvc/llvm-project?rev=108614&view=rev
Log:
Another attempt at getting the clang self-host to like my instcombine patch.

Added:
    llvm/trunk/test/Transforms/InstCombine/bit-checks.ll
Modified:
    llvm/trunk/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp

Modified: llvm/trunk/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp?rev=108614&r1=108613&r2=108614&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp (original)
+++ llvm/trunk/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp Sat Jul 17 01:56:35 2010
@@ -472,6 +472,22 @@
       Value *NewOr = Builder->CreateOr(Val, Val2);
       return Builder->CreateICmp(LHSCC, NewOr, LHSCst);
     }
+    
+    // (icmp ne (A & C1), 0) & (icmp ne (A & C2), 0) -->
+    // (icmp eq (A & (C1|C2)), (C1|C2)) where C1 and C2 are non-zero POT
+    if (LHSCC == ICmpInst::ICMP_NE && LHSCst->isZero()) {
+      Value *Op1 = 0, *Op2 = 0;
+      ConstantInt *CI1 = 0, *CI2 = 0;
+      if (match(LHS->getOperand(0), m_And(m_Value(Op1), m_ConstantInt(CI1))) &&
+          match(RHS->getOperand(0), m_And(m_Value(Op2), m_ConstantInt(CI2)))) {
+        if (Op1 == Op2 && !CI1->isZero() && !CI2->isZero() &&
+            CI1->getValue().isPowerOf2() && CI2->getValue().isPowerOf2()) {
+          Constant *ConstOr = ConstantExpr::getOr(CI1, CI2);
+          Value *NewAnd = Builder->CreateAnd(Op1, ConstOr);
+          return Builder->CreateICmp(ICmpInst::ICMP_EQ, NewAnd, ConstOr);
+        }
+      }
+    }
   }
   
   // From here on, we only handle:
@@ -1158,6 +1174,22 @@
     return Builder->CreateICmp(LHSCC, NewOr, LHSCst);
   }
   
+  // (icmp eq (A & C1), 0) | (icmp eq (A & C2), 0) -->
+  // (icmp ne (A & (C1|C2)), (C1|C2)) where C1 and C2 are non-zero POT
+  if (LHSCC == ICmpInst::ICMP_EQ && LHSCst->isZero()) {
+    Value *Op1 = 0, *Op2 = 0;
+    ConstantInt *CI1 = 0, *CI2 = 0;
+    if (match(LHS->getOperand(0), m_And(m_Value(Op1), m_ConstantInt(CI1))) &&
+        match(RHS->getOperand(0), m_And(m_Value(Op2), m_ConstantInt(CI2)))) {
+      if (Op1 == Op2 && !CI1->isZero() && !CI2->isZero() &&
+          CI1->getValue().isPowerOf2() && CI2->getValue().isPowerOf2()) {
+        Constant *ConstOr = ConstantExpr::getOr(CI1, CI2);
+        Value *NewAnd = Builder->CreateAnd(Op1, ConstOr);
+        return Builder->CreateICmp(ICmpInst::ICMP_NE, NewAnd, ConstOr);
+      }
+    }
+  }
+  
   // From here on, we only handle:
   //    (icmp1 A, C1) | (icmp2 A, C2) --> something simpler.
   if (Val != Val2) return 0;

Added: llvm/trunk/test/Transforms/InstCombine/bit-checks.ll
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/test/Transforms/InstCombine/bit-checks.ll?rev=108614&view=auto
==============================================================================
--- llvm/trunk/test/Transforms/InstCombine/bit-checks.ll (added)
+++ llvm/trunk/test/Transforms/InstCombine/bit-checks.ll Sat Jul 17 01:56:35 2010
@@ -0,0 +1,26 @@
+; This test makes sure that these instructions are properly eliminated.
+;
+; RUN: opt < %s -instcombine -S | \
+; RUN:    not grep {tobool}
+; END.
+define i32 @main(i32 %argc, i8** %argv) nounwind ssp {
+entry:
+  %and = and i32 %argc, 1                         ; <i32> [#uses=1]
+  %tobool = icmp ne i32 %and, 0                   ; <i1> [#uses=1]
+  %and2 = and i32 %argc, 2                        ; <i32> [#uses=1]
+  %tobool3 = icmp ne i32 %and2, 0                 ; <i1> [#uses=1]
+  %or.cond = and i1 %tobool, %tobool3             ; <i1> [#uses=1]
+  %retval.0 = select i1 %or.cond, i32 2, i32 1    ; <i32> [#uses=1]
+  ret i32 %retval.0
+}
+
+define i32 @main2(i32 %argc, i8** nocapture %argv) nounwind readnone ssp {
+entry:
+  %and = and i32 %argc, 1                         ; <i32> [#uses=1]
+  %tobool = icmp eq i32 %and, 0                   ; <i1> [#uses=1]
+  %and2 = and i32 %argc, 2                        ; <i32> [#uses=1]
+  %tobool3 = icmp eq i32 %and2, 0                 ; <i1> [#uses=1]
+  %or.cond = or i1 %tobool, %tobool3              ; <i1> [#uses=1]
+  %storemerge = select i1 %or.cond, i32 0, i32 1  ; <i32> [#uses=1]
+  ret i32 %storemerge
+}
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