Raymond Toy pushed to branch issue-185-x86-shorter-insts at cmucl / cmucl
Commits:
-
db1e9b11
by Carl S. Shapiro at 2023-04-26T22:59:49+00:00
1 changed file:
Changes:
| ... | ... | @@ -1274,12 +1274,7 @@ |
| 1274 | 1274 | #b00000100
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| 1275 | 1275 | #b00000101)))
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| 1276 | 1276 | (emit-sized-immediate segment size src))
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| 1277 | - ((and (not (eq size :byte))
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| 1278 | - (or (<= -128 src 127)
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| 1279 | - ;; Check that the top 25 bits are all ones so
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| 1280 | - ;; that sign-extending an 8-bit value produces
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| 1281 | - ;; the desired 32-bit value.
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| 1282 | - (= (ldb (byte 25 7) src) #x1ffffff)))
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| 1277 | + ((and (not (eq size :byte)) (<= -128 (sign-extend src 32) 127))
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| 1283 | 1278 | (emit-byte segment #b10000011)
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| 1284 | 1279 | (emit-ea segment dst opcode allow-constants)
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| 1285 | 1280 | (emit-byte segment (ldb (byte 8 0) src)))
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