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authorChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:07 +0200
committerChristian Krinitsin <mail@krinitsin.com>2025-05-30 16:52:17 +0200
commit9260319e7411ff8281700a532caa436f40120ec4 (patch)
tree2f6bfe5f3458dd49d328d3a9eb508595450adec0 /gitlab/issues/target_sparc/host_missing/accel_missing/2319.toml
parent225caa38269323af1bfc2daadff5ec8bd930747f (diff)
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-id = 2319
-title = "SPARC32-bit SDIV of negative divisor gives wrong result"
-state = "closed"
-created_at = "2024-04-30T01:02:36.888Z"
-closed_at = "2024-06-23T12:33:26.420Z"
-labels = ["target: sparc", "workflow::Patch available"]
-url = "https://gitlab.com/qemu-project/qemu/-/issues/2319"
-host-os = "- any -"
-host-arch = "- QEMU flavor:"
-qemu-version = "9.0.00"
-guest-os = "- OS/kernel version:"
-guest-arch = "SPARC"
-description = """SDIV of negative divisor gives wrong result because of typo in helper_sdiv(). This is true for QEMU 9.0.0 and earlier.
-
-Place -1 in the Y register and -128 in another reg, then -120 in another register and do SDIV into a result register, instead of the proper value of 1 for the result, the incorrect value of 0 is produced.
-
-There is a typo in target/sparc/helper.c that causes the divisor to be consider unsigned, this patch fixes it:
-
-\\*\\*\\* helper.c.ori Tue Apr 23 16:23:45 2024 --- helper.c Mon Apr 29 20:14:07 2024
-
----
-
-\\*\\*\\* 121,127 \\*\\*\\*\\* return (uint32_t)(b32 \\< 0 ? INT32_MAX : INT32_MIN) | (-1ull \\<\\< 32); }
-
-! a64 /= b; r = a64; if (unlikely(r != a64)) { return (uint32_t)(a64 \\< 0 ? INT32_MIN : INT32_MAX) | (-1ull \\<\\< 32); --- 121,127 ---- return (uint32_t)(b32 \\< 0 ? INT32_MAX : INT32_MIN) | (-1ull \\<\\< 32); }
-
-! a64 /= b32; r = a64; if (unlikely(r != a64)) { return (uint32_t)(a64 \\< 0 ? INT32_MIN : INT32_MAX) | (-1ull \\<\\< 32);"""
-reproduce = "n/a"
-additional = "n/a"