config/i386/i386.c - Issue 5488054: [PATCH i386][google]With -mtune=core2, avoid generating the slow unaligned vector load/store

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Unified Diff: config/i386/i386.c

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Issue 5488054: [PATCH i386][google]With -mtune=core2, avoid generating the slow unaligned vector load/store Base URL: svn+ssh://gcc.gnu.org/svn/gcc/branches/google/main/gcc/

Patch Set: [PATCH i386][google]With -mtune=core2, avoid generating the slow unaligned vector load/store Created 13 years, 3 months ago

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Index: config/i386/i386.c

===================================================================

--- config/i386/i386.c (revision 182265)

+++ config/i386/i386.c (working copy)

@@ -26464,6 +26464,21 @@ ix86_init_mmx_sse_builtins (void)

}

+/* Detect if this unaligned vectorizable load/stores should be

+ considered slow. This is true for core2 where the movdqu insn

+ is slow, ~5x slower than the movdqa. */

+static bool

+ix86_slow_unaligned_vector_memop (void)

+ /* This is known to be slow on core2. */

+ if (ix86_tune == PROCESSOR_CORE2_64

+ || ix86_tune == PROCESSOR_CORE2_32)

+ return true;

+ return false;

/* Internal method for ix86_init_builtins. */

static void

@@ -36624,6 +36639,9 @@ ix86_loop_unroll_adjust (unsigned nunroll, struct

#undef TARGET_BUILD_BUILTIN_VA_LIST

#define TARGET_BUILD_BUILTIN_VA_LIST ix86_build_builtin_va_list

+#undef TARGET_SLOW_UNALIGNED_VECTOR_MEMOP

+#define TARGET_SLOW_UNALIGNED_VECTOR_MEMOP ix86_slow_unaligned_vector_memop

#undef TARGET_ENUM_VA_LIST_P

#define TARGET_ENUM_VA_LIST_P ix86_enum_va_list

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