added more tests

Author: kshitijvp

llvm/lib/Analysis/ConstantFolding.cpp

@@ -3806,8 +3806,10 @@ bool llvm::isMathLibCallNoop(const CallBase *Call,
       case LibFunc_log10:
       case LibFunc_log10f:
         return Op.isNaN() || (!Op.isZero() && !Op.isNegative());
+
       case LibFunc_ilogb:
-        return !(Op.isNaN()) && !(Op.isZero() || Op.isInfinity());
+        return !Op.isNaN() && (!Op.isZero() && !Op.isInfinity());
+
       case LibFunc_expl:
       case LibFunc_exp:
       case LibFunc_expf:

llvm/test/Transforms/Util/libcalls-shrinkwrap-float.ll

@@ -223,6 +223,8 @@ entry:
 ; CHECK-NEXT: %call_11 = call float @log1pf(float %value)
 ; CHECK-NEXT: br label %[[END_LABEL]]
 ; CHECK: [[END_LABEL]]:
+
+  %call_12 = call i32 @ilogb(float %value)
   ret void
 }
 
@@ -351,5 +353,6 @@ declare float @log10f(float)
 declare float @log2f(float)
 declare float @logbf(float)
 declare float @log1pf(float)
+declare i32 @ilogb(float)
 
 ; CHECK: ![[BRANCH_WEIGHT]] = !{!"branch_weights", i32 1, i32 1048575}