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From: "sjames 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 14:17:56 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113907

--- Comment #4 from Sam James <sjames at gcc dot gnu.org> ---
Created attachment 57409
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D57409&action=3Dedit
udataswp.ii.xz

It goes wrong in common/udataswp.cpp's uprv_copyArray16 and uprv_copyArray6=
4.

(Seemingly both of them need to be pragma'd but I'll check again later as i=
t's
a bit weird.)

The first differing pass is 262r.expand.

```
[...]
-(insn # # # (set (reg:CC 17 flags)
-        (compare:CC (reg:SI 133)
-            (const_int 8 [0x8]))) "udataswp.cpp":173:9#
-     (nil))
-
-(jump_insn # # # (set (pc)
-        (if_then_else (ltu (reg:CC 17 flags)
-                (const_int 0 [0]))
-            (label_ref #)
-            (pc))) "udataswp.cpp":173:9#
-     (int_list:REG_BR_PROB 644245100 (nil)))
[...]
@@ -6876,15 +6862,11 @@ Merged 2 and 3 without moving.
 Edge 7->9 redirected to 10
 Forwarding edge 8->9 to 10 failed.
 Deleted label in block 9.
-Redirecting jump 51 from 24 to 25.
-Edge 19->21 redirected to 22
-Merging block 21 into block 20...
-Merged blocks 20 and 21.
-Merged 20 and 21 without moving.
-Merging block 24 into block 23...
-Merged blocks 23 and 24.
-Merged 23 and 24 without moving.
-Removing jump 128.
+Redirecting jump 51 from 22 to 23.
+Merging block 22 into block 21...
+Merged blocks 21 and 22.
+Merged 21 and 22 without moving.
+Removing jump 123.
[...]
```=