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-rw-r--r--src/block/idea_sse2/idea_sse2.cpp4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/block/idea_sse2/idea_sse2.cpp b/src/block/idea_sse2/idea_sse2.cpp
index 81b0fd9c1..70698560d 100644
--- a/src/block/idea_sse2/idea_sse2.cpp
+++ b/src/block/idea_sse2/idea_sse2.cpp
@@ -28,7 +28,9 @@ inline __m128i mul(__m128i X, u16bit K_16)
__m128i T = _mm_sub_epi16(mul_lo, mul_hi);
// Unsigned compare; cmp = 1 if mul_lo < mul_hi else 0
- const __m128i cmp = _mm_min_epu8(ones, _mm_subs_epu16(mul_hi, mul_lo));
+ const __m128i subs = _mm_subs_epu16(mul_hi, mul_lo);
+ const __m128i cmp = _mm_min_epu8(
+ _mm_or_si128(subs, _mm_srli_epi16(subs, 8)), ones);
T = _mm_add_epi16(T, cmp);