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[Bug target/86314] [7/8/9 Regression] GCC 7.x and 8.x zero out "eax" before using "rax" in "lock bts"
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 26 Jun 2018 07:24:55 +0000
- Subject: [Bug target/86314] [7/8/9 Regression] GCC 7.x and 8.x zero out "eax" before using "rax" in "lock bts"
- Auto-submitted: auto-generated
- References: <bug-86314-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86314
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Status|UNCONFIRMED |NEW
Known to work| |6.4.1
Keywords| |wrong-code
Last reconfirmed| |2018-06-26
Ever confirmed|0 |1
Summary|GCC 7.x and 8.x zero out |[7/8/9 Regression] GCC 7.x
|"eax" before using "rax" in |and 8.x zero out "eax"
|"lock bts" |before using "rax" in "lock
| |bts"
Target Milestone|--- |7.4
Known to fail| |7.3.1, 8.1.1, 9.0
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed. GCC 6 code generation is wastly different but doesn't exhibit this
issue.