[edk2-devel] [PATCH v2 2/4] ArmPkg/CompilerIntrinsicsLib: Add memcmp, memmove intrinsics for MSFT

[Pete Batard]

We could have reused memmove.asm for ARM, but we would still need to add
an implemention for ARM64, so we use the same source for both archs.

Cc: Ard Biesheuvel <ard.biesheuvel at linaro.org>
Cc: Leif Lindholm <leif.lindholm at linaro.org>
Signed-off-by: Pete Batard <pete at akeo.ie>
---
 ArmPkg/Library/CompilerIntrinsicsLib/CompilerIntrinsicsLib.inf |  2 ++
 ArmPkg/Library/CompilerIntrinsicsLib/memcmp_ms.c               | 31 ++++++++++++++++++
 ArmPkg/Library/CompilerIntrinsicsLib/memmove_ms.c              | 34 ++++++++++++++++++++
 3 files changed, 67 insertions(+)

diff --git a/ArmPkg/Library/CompilerIntrinsicsLib/CompilerIntrinsicsLib.inf b/ArmPkg/Library/CompilerIntrinsicsLib/CompilerIntrinsicsLib.inf
index 0203ecb4870f..d6cc63db75c7 100644
--- a/ArmPkg/Library/CompilerIntrinsicsLib/CompilerIntrinsicsLib.inf
+++ b/ArmPkg/Library/CompilerIntrinsicsLib/CompilerIntrinsicsLib.inf
@@ -26,6 +26,8 @@ [Sources]
 
   memcpy_ms.c          | MSFT
   memset_ms.c          | MSFT
+  memcmp_ms.c          | MSFT
+  memmove_ms.c         | MSFT
 
 [Sources.ARM]
   Arm/mullu.asm        | RVCT
diff --git a/ArmPkg/Library/CompilerIntrinsicsLib/memcmp_ms.c b/ArmPkg/Library/CompilerIntrinsicsLib/memcmp_ms.c
new file mode 100644
index 000000000000..551f8e77c12f
--- /dev/null
+++ b/ArmPkg/Library/CompilerIntrinsicsLib/memcmp_ms.c
@@ -0,0 +1,31 @@
+//------------------------------------------------------------------------------
+//
+// Copyright (c) 2019, Pete Batard. All rights reserved.
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+//------------------------------------------------------------------------------
+
+#if defined(_M_ARM64)
+typedef unsigned __int64  size_t;
+#else
+typedef unsigned __int32  size_t;
+#endif
+
+int memcmp(void *, void *, size_t);
+#pragma intrinsic(memcmp)
+#pragma function(memcmp)
+int memcmp(const void *s1, const void *s2, size_t n)
+{
+  unsigned char const *t1 = s1;
+  unsigned char const *t2 = s2;
+
+  while (n--) {
+    if (*t1 != *t2)
+      return (int)*t1 - (int)*t2;
+    t1++;
+    t2++;
+  }
+
+  return 0;
+}
diff --git a/ArmPkg/Library/CompilerIntrinsicsLib/memmove_ms.c b/ArmPkg/Library/CompilerIntrinsicsLib/memmove_ms.c
new file mode 100644
index 000000000000..5b261ef8b948
--- /dev/null
+++ b/ArmPkg/Library/CompilerIntrinsicsLib/memmove_ms.c
@@ -0,0 +1,34 @@
+//------------------------------------------------------------------------------
+//
+// Copyright (c) 2019, Pete Batard. All rights reserved.
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+//------------------------------------------------------------------------------
+
+#if defined(_M_ARM64)
+typedef unsigned __int64  size_t;
+#else
+typedef unsigned __int32  size_t;
+#endif
+
+void* memmove(void *, const void *, size_t);
+#pragma intrinsic(memmove)
+#pragma function(memmove)
+void* memmove(void *dest, const void *src, size_t n)
+{
+  unsigned char *d = dest;
+  unsigned char const *s = src;
+
+  if (d < s) {
+    while (n--)
+      *d++ = *s++;
+  } else {
+    d += n;
+    s += n;
+    while (n--)
+      *--d = *--s;
+  }
+
+  return dest;
+}
-- 
2.21.0.windows.1


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