https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104458
Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |ubizjak at gmail dot com
Last reconfirmed| |2022-02-09
Ever confirmed|0 |1
--- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> ---
The testcase is quite creative with casts, creating:
(gdb) p debug_rtx ( operands[3])
(subreg:DI (reg:V2SF 96) 0)
which chokes lowpart_subreg. So, force inputs to a register, which is
preferable even when the input is from a memory.
--cut here--
diff --git a/gcc/config/i386/i386-expand.cc b/gcc/config/i386/i386-expand.cc
index eb1930ba375..ce9607e36de 100644
--- a/gcc/config/i386/i386-expand.cc
+++ b/gcc/config/i386/i386-expand.cc
@@ -1407,6 +1407,9 @@ ix86_split_idivmod (machine_mode mode, rtx operands[],
rtx scratch, tmp0, tmp1, tmp2;
rtx (*gen_divmod4_1) (rtx, rtx, rtx, rtx);
+ operands[2] = force_reg (mode, operands[2]);
+ operands[3] = force_reg (mode, operands[3]);
+
switch (mode)
{
case E_SImode:
--cut here--
