diff --git a/lib/common/bits.h b/lib/common/bits.h
index def56c474..992cc6925 100644
--- a/lib/common/bits.h
+++ b/lib/common/bits.h
@@ -43,6 +43,8 @@ MEM_STATIC unsigned ZSTD_countTrailingZeros32(U32 val)
 #       endif
 #   elif defined(__GNUC__) && (__GNUC__ >= 4)
         return (unsigned)__builtin_ctz(val);
+#   elif defined(__ICCARM__)
+        return (unsigned)__builtin_ctz(val);
 #   else
         return ZSTD_countTrailingZeros32_fallback(val);
 #   endif
@@ -82,6 +84,8 @@ MEM_STATIC unsigned ZSTD_countLeadingZeros32(U32 val)
 #       endif
 #   elif defined(__GNUC__) && (__GNUC__ >= 4)
         return (unsigned)__builtin_clz(val);
+#   elif defined(__ICCARM__)
+        return (unsigned)__builtin_clz(val);
 #   else
         return ZSTD_countLeadingZeros32_fallback(val);
 #   endif
@@ -105,6 +109,8 @@ MEM_STATIC unsigned ZSTD_countTrailingZeros64(U64 val)
 #       endif
 #   elif defined(__GNUC__) && (__GNUC__ >= 4) && defined(__LP64__)
         return (unsigned)__builtin_ctzll(val);
+#   elif defined(__ICCARM__)
+        return (unsigned)__builtin_ctzll(val);
 #   else
         {
             U32 mostSignificantWord = (U32)(val >> 32);
@@ -136,6 +142,8 @@ MEM_STATIC unsigned ZSTD_countLeadingZeros64(U64 val)
 #       endif
 #   elif defined(__GNUC__) && (__GNUC__ >= 4)
         return (unsigned)(__builtin_clzll(val));
+#   elif defined(__ICCARM__)
+        return (unsigned)(__builtin_clzll(val));
 #   else
         {
             U32 mostSignificantWord = (U32)(val >> 32);
diff --git a/lib/common/compiler.h b/lib/common/compiler.h
index 31880ecbe..1371212ef 100644
--- a/lib/common/compiler.h
+++ b/lib/common/compiler.h
@@ -27,7 +27,7 @@
 #  define INLINE_KEYWORD
 #endif
 
-#if defined(__GNUC__) || defined(__ICCARM__)
+#if defined(__GNUC__) || defined(__IAR_SYSTEMS_ICC__)
 #  define FORCE_INLINE_ATTR __attribute__((always_inline))
 #elif defined(_MSC_VER)
 #  define FORCE_INLINE_ATTR __forceinline
@@ -54,7 +54,7 @@
 #endif
 
 /* UNUSED_ATTR tells the compiler it is okay if the function is unused. */
-#if defined(__GNUC__)
+#if defined(__GNUC__) || defined(__IAR_SYSTEMS_ICC__)
 #  define UNUSED_ATTR __attribute__((unused))
 #else
 #  define UNUSED_ATTR
@@ -95,6 +95,8 @@
 #ifndef MEM_STATIC  /* already defined in Linux Kernel mem.h */
 #if defined(__GNUC__)
 #  define MEM_STATIC static __inline UNUSED_ATTR
+#elif defined(__IAR_SYSTEMS_ICC__)
+#  define MEM_STATIC static inline UNUSED_ATTR
 #elif defined (__cplusplus) || (defined (__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) /* C99 */)
 #  define MEM_STATIC static inline
 #elif defined(_MSC_VER)
@@ -108,7 +110,7 @@
 #ifdef _MSC_VER
 #  define FORCE_NOINLINE static __declspec(noinline)
 #else
-#  if defined(__GNUC__) || defined(__ICCARM__)
+#  if defined(__GNUC__) || defined(__IAR_SYSTEMS_ICC__)
 #    define FORCE_NOINLINE static __attribute__((__noinline__))
 #  else
 #    define FORCE_NOINLINE static
@@ -117,7 +119,7 @@
 
 
 /* target attribute */
-#if defined(__GNUC__) || defined(__ICCARM__)
+#if defined(__GNUC__) || defined(__IAR_SYSTEMS_ICC__)
 #  define TARGET_ATTRIBUTE(target) __attribute__((__target__(target)))
 #else
 #  define TARGET_ATTRIBUTE(target)
diff --git a/lib/common/mem.h b/lib/common/mem.h
index 096f4be51..a02141c9d 100644
--- a/lib/common/mem.h
+++ b/lib/common/mem.h
@@ -30,6 +30,8 @@ extern "C" {
 #if defined(_MSC_VER)   /* Visual Studio */
 #   include <stdlib.h>  /* _byteswap_ulong */
 #   include <intrin.h>  /* _byteswap_* */
+#elif defined(__ICCARM__)
+#   include <intrinsics.h>
 #endif
 
 /*-**************************************************************
@@ -154,6 +156,8 @@ MEM_STATIC unsigned MEM_isLittleEndian(void)
     return 1;
 #elif defined(__DMC__) && defined(_M_IX86)
     return 1;
+#elif defined(__IAR_SYSTEMS_ICC__) && __LITTLE_ENDIAN__
+    return 1;
 #else
     const union { U32 u; BYTE c[4]; } one = { 1 };   /* don't use static : performance detrimental  */
     return one.c[0];
@@ -246,6 +250,8 @@ MEM_STATIC U32 MEM_swap32(U32 in)
 #elif (defined (__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ >= 403)) \
   || (defined(__clang__) && __has_builtin(__builtin_bswap32))
     return __builtin_bswap32(in);
+#elif defined(__ICCARM__)
+    return __REV(in);
 #else
     return MEM_swap32_fallback(in);
 #endif
diff --git a/lib/zstd.h b/lib/zstd.h
index aa4ea23af..338bdb7ed 100644
--- a/lib/zstd.h
+++ b/lib/zstd.h
@@ -57,7 +57,7 @@ extern "C" {
 #else
 #  if defined (__cplusplus) && (__cplusplus >= 201402) /* C++14 or greater */
 #    define ZSTD_DEPRECATED(message) [[deprecated(message)]]
-#  elif (defined(GNUC) && (GNUC > 4 || (GNUC == 4 && GNUC_MINOR >= 5))) || defined(__clang__)
+#  elif (defined(GNUC) && (GNUC > 4 || (GNUC == 4 && GNUC_MINOR >= 5))) || defined(__clang__) || defined(__IAR_SYSTEMS_ICC__)
 #    define ZSTD_DEPRECATED(message) __attribute__((deprecated(message)))
 #  elif defined(__GNUC__) && (__GNUC__ >= 3)
 #    define ZSTD_DEPRECATED(message) __attribute__((deprecated))