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Diffstat (limited to 'src/devices/cpu/alpha/common.h')
-rw-r--r--src/devices/cpu/alpha/common.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/devices/cpu/alpha/common.h b/src/devices/cpu/alpha/common.h
index 0c9668f304a..61daeccdcbc 100644
--- a/src/devices/cpu/alpha/common.h
+++ b/src/devices/cpu/alpha/common.h
@@ -13,7 +13,7 @@
#define Im(x) (u64(u8(x >> 13))) // literal immediate field
#define Disp_M(x) (s64(s16(x))) // memory instruction 16-bit signed offset
-#define Disp_P(x) (s64(s16(x << 4)) >> 4) // hardware load/store 12-bit signed offset
-#define Disp_B(x) (s64(s32(x << 11)) >> 9) // branch instruction offset
+#define Disp_P(x) (s64(util::sext(x, 12))) // hardware load/store 12-bit signed offset
+#define Disp_B(x) (s64(util::sext(x << 2, 23))) // branch instruction offset
#endif // MAME_CPU_ALPHA_COMMON_H