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[Base] Add workaround for GCC bug 

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100801
This commit is contained in:
Joel Linn 2021-05-28 21:41:33 +02:00 committed by Rick Gibbed
parent 856d23a150
commit 10ff77a24f
1 changed files with 18 additions and 0 deletions
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18
src/xenia/base/memory.cc
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@ -43,6 +43,16 @@ void copy_128_aligned(void* dest, const void* src, size_t count) {
} }
#if XE_ARCH_AMD64 #if XE_ARCH_AMD64
// This works around a GCC bug
// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100801
// TODO(Joel Linn): Remove this when fixed GCC versions are common place.
#if XE_COMPILER_GNUC
#define XE_WORKAROUND_LOOP_KILL_MOD(x) \
if ((count % (x)) == 0) __builtin_unreachable();
#else
#define XE_WORKAROUND_LOOP_KILL_MOD(x)
#endif
void copy_and_swap_16_aligned(void* dest_ptr, const void* src_ptr, void copy_and_swap_16_aligned(void* dest_ptr, const void* src_ptr,
size_t count) { size_t count) {
assert_zero(reinterpret_cast<uintptr_t>(dest_ptr) & 0xF); assert_zero(reinterpret_cast<uintptr_t>(dest_ptr) & 0xF);
@ -61,6 +71,7 @@ void copy_and_swap_16_aligned(void* dest_ptr, const void* src_ptr,
_mm_store_si128(reinterpret_cast<__m128i*>(&dest[i]), output); _mm_store_si128(reinterpret_cast<__m128i*>(&dest[i]), output);
} }
for (; i < count; ++i) { // handle residual elements for (; i < count; ++i) { // handle residual elements
XE_WORKAROUND_LOOP_KILL_MOD(8);
dest[i] = byte_swap(src[i]); dest[i] = byte_swap(src[i]);
} }
} }
@ -80,6 +91,7 @@ void copy_and_swap_16_unaligned(void* dest_ptr, const void* src_ptr,
_mm_storeu_si128(reinterpret_cast<__m128i*>(&dest[i]), output); _mm_storeu_si128(reinterpret_cast<__m128i*>(&dest[i]), output);
} }
for (; i < count; ++i) { // handle residual elements for (; i < count; ++i) { // handle residual elements
XE_WORKAROUND_LOOP_KILL_MOD(8);
dest[i] = byte_swap(src[i]); dest[i] = byte_swap(src[i]);
} }
} }
@ -102,6 +114,7 @@ void copy_and_swap_32_aligned(void* dest_ptr, const void* src_ptr,
_mm_store_si128(reinterpret_cast<__m128i*>(&dest[i]), output); _mm_store_si128(reinterpret_cast<__m128i*>(&dest[i]), output);
} }
for (; i < count; ++i) { // handle residual elements for (; i < count; ++i) { // handle residual elements
XE_WORKAROUND_LOOP_KILL_MOD(4);
dest[i] = byte_swap(src[i]); dest[i] = byte_swap(src[i]);
} }
} }
@ -121,6 +134,7 @@ void copy_and_swap_32_unaligned(void* dest_ptr, const void* src_ptr,
_mm_storeu_si128(reinterpret_cast<__m128i*>(&dest[i]), output); _mm_storeu_si128(reinterpret_cast<__m128i*>(&dest[i]), output);
} }
for (; i < count; ++i) { // handle residual elements for (; i < count; ++i) { // handle residual elements
XE_WORKAROUND_LOOP_KILL_MOD(4);
dest[i] = byte_swap(src[i]); dest[i] = byte_swap(src[i]);
} }
} }
@ -143,6 +157,7 @@ void copy_and_swap_64_aligned(void* dest_ptr, const void* src_ptr,
_mm_store_si128(reinterpret_cast<__m128i*>(&dest[i]), output); _mm_store_si128(reinterpret_cast<__m128i*>(&dest[i]), output);
} }
for (; i < count; ++i) { // handle residual elements for (; i < count; ++i) { // handle residual elements
XE_WORKAROUND_LOOP_KILL_MOD(2);
dest[i] = byte_swap(src[i]); dest[i] = byte_swap(src[i]);
} }
} }
@ -162,6 +177,7 @@ void copy_and_swap_64_unaligned(void* dest_ptr, const void* src_ptr,
_mm_storeu_si128(reinterpret_cast<__m128i*>(&dest[i]), output); _mm_storeu_si128(reinterpret_cast<__m128i*>(&dest[i]), output);
} }
for (; i < count; ++i) { // handle residual elements for (; i < count; ++i) { // handle residual elements
XE_WORKAROUND_LOOP_KILL_MOD(2);
dest[i] = byte_swap(src[i]); dest[i] = byte_swap(src[i]);
} }
} }
@ -178,6 +194,7 @@ void copy_and_swap_16_in_32_aligned(void* dest_ptr, const void* src_ptr,
_mm_store_si128(reinterpret_cast<__m128i*>(&dest[i]), output); _mm_store_si128(reinterpret_cast<__m128i*>(&dest[i]), output);
} }
for (; i < count; ++i) { // handle residual elements for (; i < count; ++i) { // handle residual elements
XE_WORKAROUND_LOOP_KILL_MOD(4);
dest[i] = (src[i] >> 16) | (src[i] << 16); dest[i] = (src[i] >> 16) | (src[i] << 16);
} }
} }
@ -194,6 +211,7 @@ void copy_and_swap_16_in_32_unaligned(void* dest_ptr, const void* src_ptr,
_mm_storeu_si128(reinterpret_cast<__m128i*>(&dest[i]), output); _mm_storeu_si128(reinterpret_cast<__m128i*>(&dest[i]), output);
} }
for (; i < count; ++i) { // handle residual elements for (; i < count; ++i) { // handle residual elements
XE_WORKAROUND_LOOP_KILL_MOD(4);
dest[i] = (src[i] >> 16) | (src[i] << 16); dest[i] = (src[i] >> 16) | (src[i] << 16);
} }
} }