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From: "rsandifo at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/94605] New: [8/9/10 Regression] ICE in
 early-remat.c:process_block with multi-output asms
Date: Wed, 15 Apr 2020 10:32:43 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D94605

            Bug ID: 94605
           Summary: [8/9/10 Regression] ICE in early-remat.c:process_block
                    with multi-output asms
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: rsandifo at gcc dot gnu.org
  Target Milestone: ---
            Target: aarch64*-*-*

Compiling the following testcase with -O2 -march=3Darmv8.2-a+sve:

typedef int v8si __attribute__((vector_size(32)));
int g (v8si, v8si);

void
f (void)
{
  v8si x =3D {}, y =3D {};
  while (g (x, y))
    asm ("" : "+w" (x), "+w" (y));
}

triggers:

internal compiler error: in process_block, at early-remat.c:2051

This is because process_block doesn't handle insns that set
multiple candidate registers.=