By min, I mean max.

[oota-llvm.git] / lib / Analysis / ValueTracking.cpp

diff --git a/lib/Analysis/ValueTracking.cpp b/lib/Analysis/ValueTracking.cpp
index e35f0d0fcedd4bc98907851db8fa9f8c965bde63..3a04f5eb869c8dccee19368374fd5b52f9a82348 100644 (file)
--- a/lib/Analysis/ValueTracking.cpp
+++ b/lib/Analysis/ValueTracking.cpp
@@ -369,15 +369,13 @@ void llvm::ComputeMaskedBits(Value *V, const APInt &Mask,
         ComputeMaskedBits(I->getOperand(0), Mask2, KnownZero2, KnownOne2, TD, 
                           Depth+1);
 
-        // The sign of a remainder is equal to the sign of the first
-        // operand (zero being positive).
+        // If the sign bit of the first operand is zero, the sign bit of
+        // the result is zero. If the first operand has no one bits below
+        // the second operand's single 1 bit, its sign will be zero.
         if (KnownZero2[BitWidth-1] || ((KnownZero2 & LowBits) == LowBits))
           KnownZero2 |= ~LowBits;
-        else if (KnownOne2[BitWidth-1])
-          KnownOne2 |= ~LowBits;
 
         KnownZero |= KnownZero2 & Mask;
-        KnownOne |= KnownOne2 & Mask;
 
         assert((KnownZero & KnownOne) == 0&&"Bits known to be one AND zero?"); 
       }