diff --git a/src/coreclr/jit/emit.cpp b/src/coreclr/jit/emit.cpp
index 9afbc4b39d2d4..f1f716d6de420 100644
--- a/src/coreclr/jit/emit.cpp
+++ b/src/coreclr/jit/emit.cpp
@@ -8361,7 +8361,7 @@ void emitter::emitDispDataSec(dataSecDsc* section, BYTE* dst)
             bool      isRelative = (data->dsType == dataSection::blockRelative32);
             size_t    blockCount = data->dsSize / (isRelative ? 4 : TARGET_POINTER_SIZE);
 
-            for (unsigned i = 0; i < blockCount; i++)
+            for (size_t i = 0; i < blockCount; i++)
             {
                 if (i > 0)
                 {
diff --git a/src/coreclr/jit/lowerxarch.cpp b/src/coreclr/jit/lowerxarch.cpp
index e2c4671974773..3adeccf516fd1 100644
--- a/src/coreclr/jit/lowerxarch.cpp
+++ b/src/coreclr/jit/lowerxarch.cpp
@@ -4845,8 +4845,6 @@ GenTree* Lowering::LowerHWIntrinsicCreate(GenTreeHWIntrinsic* node)
         case TYP_INT:
         case TYP_UINT:
         {
-            unsigned       N            = 0;
-            GenTree*       opN          = nullptr;
             NamedIntrinsic insIntrinsic = NI_Illegal;
 
             if ((simdBaseType == TYP_SHORT) || (simdBaseType == TYP_USHORT))
@@ -4861,7 +4859,7 @@ GenTree* Lowering::LowerHWIntrinsicCreate(GenTreeHWIntrinsic* node)
 
             if (insIntrinsic != NI_Illegal)
             {
-                for (N = 1; N < argCnt - 1; N++)
+                for (size_t N = 1; N < argCnt - 1; N++)
                 {
                     // We will be constructing the following parts:
                     //   ...
@@ -4877,7 +4875,7 @@ GenTree* Lowering::LowerHWIntrinsicCreate(GenTreeHWIntrinsic* node)
                     //   tmp1 = Sse?.Insert(tmp1, opN, N);
                     //   ...
 
-                    opN = node->Op(N + 1);
+                    GenTree* opN = node->Op(N + 1);
 
                     idx = comp->gtNewIconNode(N, TYP_INT);
                     // Place the insert as early as possible to avoid creating a lot of long lifetimes.
@@ -4889,26 +4887,24 @@ GenTree* Lowering::LowerHWIntrinsicCreate(GenTreeHWIntrinsic* node)
                     LowerNode(tmp1);
                 }
 
-                assert(N == (argCnt - 1));
-
                 // We will be constructing the following parts:
-                //   idx  =    CNS_INT       int    N
-                //          /--*  tmp1 simd16
-                //          +--*  opN  T
-                //          +--*  idx  int
+                //   idx  =    CNS_INT       int    (argCnt - 1)
+                //          /--*  tmp1   simd16
+                //          +--*  lastOp T
+                //          +--*  idx    int
                 //   node = *  HWINTRINSIC   simd16 T Insert
 
                 // This is roughly the following managed code:
                 //   ...
-                //   tmp1 = Sse?.Insert(tmp1, opN, N);
+                //   tmp1 = Sse?.Insert(tmp1, lastOp, (argCnt - 1));
                 //   ...
 
-                opN = node->Op(argCnt);
+                GenTree* lastOp = node->Op(argCnt);
 
-                idx = comp->gtNewIconNode(N, TYP_INT);
-                BlockRange().InsertAfter(opN, idx);
+                idx = comp->gtNewIconNode((argCnt - 1), TYP_INT);
+                BlockRange().InsertAfter(lastOp, idx);
 
-                node->ResetHWIntrinsicId(insIntrinsic, comp, tmp1, opN, idx);
+                node->ResetHWIntrinsicId(insIntrinsic, comp, tmp1, lastOp, idx);
                 break;
             }
 
@@ -4918,9 +4914,9 @@ GenTree* Lowering::LowerHWIntrinsicCreate(GenTreeHWIntrinsic* node)
             GenTree* op[16];
             op[0] = tmp1;
 
-            for (N = 1; N < argCnt; N++)
+            for (size_t N = 1; N < argCnt; N++)
             {
-                opN = node->Op(N + 1);
+                GenTree* opN = node->Op(N + 1);
 
                 op[N] = InsertNewSimdCreateScalarUnsafeNode(TYP_SIMD16, opN, simdBaseJitType, 16);
                 LowerNode(op[N]);
@@ -4928,7 +4924,7 @@ GenTree* Lowering::LowerHWIntrinsicCreate(GenTreeHWIntrinsic* node)
 
             if ((simdBaseType == TYP_BYTE) || (simdBaseType == TYP_UBYTE))
             {
-                for (N = 0; N < argCnt; N += 4)
+                for (size_t N = 0; N < argCnt; N += 4)
                 {
                     // We will be constructing the following parts:
                     //   ...
@@ -4958,9 +4954,9 @@ GenTree* Lowering::LowerHWIntrinsicCreate(GenTreeHWIntrinsic* node)
                     //   tmp3 = Sse2.UnpackLow(tmp1, tmp2);
                     //   ...
 
-                    unsigned O = N + 1;
-                    unsigned P = N + 2;
-                    unsigned Q = N + 3;
+                    size_t O = N + 1;
+                    size_t P = N + 2;
+                    size_t Q = N + 3;
 
                     tmp1 = comp->gtNewSimdHWIntrinsicNode(simdType, op[N], op[O], NI_SSE2_UnpackLow, CORINFO_TYPE_UBYTE,
                                                           simdSize);
diff --git a/src/coreclr/tools/superpmi/superpmi-shared/mclist.cpp b/src/coreclr/tools/superpmi/superpmi-shared/mclist.cpp
index bea3ef6e93706..79dca0cdc766a 100644
--- a/src/coreclr/tools/superpmi/superpmi-shared/mclist.cpp
+++ b/src/coreclr/tools/superpmi/superpmi-shared/mclist.cpp
@@ -16,7 +16,7 @@ bool MCList::processArgAsMCL(char* input, int* count, int** list)
 
     size_t len = strlen(input);
 
-    for (unsigned int i = 0; (i < len) && isRangeList; i++)
+    for (size_t i = 0; (i < len) && isRangeList; i++)
     {
         if ((input[i] != '-') && (input[i] != ',') && (!isdigit((unsigned char)input[i])))
             isRangeList = false;
diff --git a/src/coreclr/tools/superpmi/superpmi/icorjitinfo.cpp b/src/coreclr/tools/superpmi/superpmi/icorjitinfo.cpp
index 64c52f61705ae..3b9c00aba9568 100644
--- a/src/coreclr/tools/superpmi/superpmi/icorjitinfo.cpp
+++ b/src/coreclr/tools/superpmi/superpmi/icorjitinfo.cpp
@@ -1775,7 +1775,7 @@ int MyICJI::doAssert(const char* szFile, int iLine, const char* szExpr)
     sprintf_s(buff, sizeof(buff), "%s (%d) - %s", szFile, iLine, szExpr);
 
     LogIssue(ISSUE_ASSERT, "#%d %s", jitInstance->mc->index, buff);
-    jitInstance->mc->cr->recMessageLog(buff);
+    jitInstance->mc->cr->recMessageLog("%s", buff);
 
     // Under "/boa", ask the user if they want to attach a debugger. If they do, the debugger will be attached,
     // then we'll call DebugBreakorAV(), which will issue a __debugbreak() and actually cause