From 1107465f31f59dd73dfdfcca764d1a0bccdbe306 Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Mon, 13 Jan 2025 22:22:45 +0100
Subject: [PATCH] Avoid clang warning in -fsanitize=undefined -O mode (master
 only)

Fixes #11645
---
 gcore/rasterio.cpp       | 16 ++++++++++++++++
 gcore/rasterio_ssse3.cpp |  8 ++++++++
 2 files changed, 24 insertions(+)

diff --git a/gcore/rasterio.cpp b/gcore/rasterio.cpp
index fed171e9c8e1..bc06c11a8d7c 100644
--- a/gcore/rasterio.cpp
+++ b/gcore/rasterio.cpp
@@ -5944,6 +5944,11 @@ __attribute__((optimize("tree-vectorize")))
 #if defined(__GNUC__)
 __attribute__((noinline))
 #endif
+#if defined(__clang__) && !defined(__INTEL_CLANG_COMPILER)
+// clang++ -O2 -fsanitize=undefined fails to vectorize, ignore that warning
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wpass-failed"
+#endif
 static void
 GDALInterleave2Byte(const uint8_t *CPL_RESTRICT pSrc,
                     uint8_t *CPL_RESTRICT pDst, size_t nIters)
@@ -5957,6 +5962,9 @@ GDALInterleave2Byte(const uint8_t *CPL_RESTRICT pSrc,
         pDst[2 * i + 1] = pSrc[i + 1 * nIters];
     }
 }
+#if defined(__clang__) && !defined(__INTEL_CLANG_COMPILER)
+#pragma clang diagnostic pop
+#endif
 
 #endif
 
@@ -6039,6 +6047,11 @@ __attribute__((optimize("tree-vectorize")))
 #if defined(__GNUC__)
 __attribute__((noinline))
 #endif
+#if defined(__clang__) && !defined(__INTEL_CLANG_COMPILER)
+// clang++ -O2 -fsanitize=undefined fails to vectorize, ignore that warning
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wpass-failed"
+#endif
 static void
 GDALInterleave4Byte(const uint8_t *CPL_RESTRICT pSrc,
                     uint8_t *CPL_RESTRICT pDst, size_t nIters)
@@ -6054,6 +6067,9 @@ GDALInterleave4Byte(const uint8_t *CPL_RESTRICT pSrc,
         pDst[4 * i + 3] = pSrc[i + 3 * nIters];
     }
 }
+#if defined(__clang__) && !defined(__INTEL_CLANG_COMPILER)
+#pragma clang diagnostic pop
+#endif
 
 #endif
 
diff --git a/gcore/rasterio_ssse3.cpp b/gcore/rasterio_ssse3.cpp
index 9bf80e34096a..8bbfdab4a134 100644
--- a/gcore/rasterio_ssse3.cpp
+++ b/gcore/rasterio_ssse3.cpp
@@ -420,6 +420,11 @@ __attribute__((optimize("tree-vectorize")))
 #if defined(__GNUC__)
 __attribute__((noinline))
 #endif
+#if defined(__clang__) && !defined(__INTEL_CLANG_COMPILER)
+// clang++ -O2 -fsanitize=undefined fails to vectorize, ignore that warning
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wpass-failed"
+#endif
 static void
 GDALInterleave3Byte_SSSE3(const uint8_t *CPL_RESTRICT pSrc,
                           uint8_t *CPL_RESTRICT pDst, size_t nIters)
@@ -434,6 +439,9 @@ GDALInterleave3Byte_SSSE3(const uint8_t *CPL_RESTRICT pSrc,
         pDst[3 * i + 2] = pSrc[i + 2 * nIters];
     }
 }
+#if defined(__clang__) && !defined(__INTEL_CLANG_COMPILER)
+#pragma clang diagnostic pop
+#endif
 
 #endif