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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/113907] [14 regression] ICU miscompiled since on x86
 since r14-5109-ga291237b628f41
Date: Tue, 13 Feb 2024 15:36:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113907

--- Comment #17 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
One set of range changes in evrp is more precise ranges in return values of
uprv_swapArray{16,32,64}, those contain early return 0 if
length<0 || (length&1)!=3D0
or
length<0 || (length&3)!=3D0
or
length<0 || (length&7)!=3D0
so changing those return ranges from [0, +INF] to [0, 0][4, +INF] (for the
second, 2 or 8 instead of 4 for the first/last) seems completely reasonable.
And uprv_copyArray{16,32,64} has something very similar,
length<0 || (length&{1,3,7})!=3D0 early exit and length > 0 guarded memcpy.
So, even there it is completely reasonable to change
-  # RANGE [irange] unsigned int [1, 2147483647] MASK 0x7ffffff8 VALUE 0x0
+  # RANGE [irange] unsigned int [8, 2147483647] MASK 0x7ffffff8 VALUE 0x0
   length.37_10 =3D (unsigned int) length_25(D);
   memcpy (outData_26(D), inData_24(D), length.37_10);
for the copy and
-  # RANGE [irange] int32_t [0, +INF] MASK 0x7fffffff VALUE 0x0
+  # RANGE [irange] int32_t [0, 0][8, +INF] MASK 0x7fffffff VALUE 0x0
   # _12 =3D PHI <0(4), 0(9), length_25(D)(12)>
   return _12;
for the return, but naturally copyData16 uses 2 instead of 8 and copyData32=
 4
instead of 8.

What seems wrong is that the 8 in the ranges somehow leaks into copyData16
during IPA.
IPA-ICF?=