https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112860

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |101057
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2023-12-05
             Target|                            |x86_64-*-*
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot 
gnu.org

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
vect_iftmp_12_158 = VEC_COND_EXPR <_151, vect__1_8_154, { 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0 }>;

this shows startwith("slp") and -O0 don't play together and the ISEL pass
is skipped.

Don't mix startwith with an optimization level that doesn't enable the pass
or with a name that doesn't exist.

For ISEL specifically we should possibly provide a property as we lower
VEC_COND_EXPR there.  Or always execute it.

diff --git a/gcc/passes.cc b/gcc/passes.cc
index 6f894a41d22..cfdfe77e122 100644
--- a/gcc/passes.cc
+++ b/gcc/passes.cc
@@ -2514,6 +2514,10 @@ should_skip_pass_p (opt_pass *pass)
   if (strstr (pass->name, "build_cgraph_edges") != NULL)
     return false;

+  /* We need to run ISEL.  */
+  if (strstr (pass->name, "isel") != NULL)
+    return false;
+
   /* Don't skip df init; later RTL passes need it.  */
   if (strstr (pass->name, "dfinit") != NULL
       || strstr (pass->name, "dfinish") != NULL)


"Confirmed."


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101057
[Bug 101057] [gimplefe] GIMPLE frontend issues

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