[Bug target/100217] New: [11/12 Regression] ICE when building valgrind testsuite with -march=z14 since r11-7552

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100217

            Bug ID: 100217
           Summary: [11/12 Regression] ICE when building valgrind
                    testsuite with -march=z14 since r11-7552
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jakub at gcc dot gnu.org
  Target Milestone: ---

The following testcase reduced from valgrind ICEs on s390x with
-mlong-double-128 -march=z14 (with -O2 too):
void
foo (void)
{
  register long double f0 asm ("f0");
  f0 = 1.0L;
  asm("" : : "f" (f0));
}
starting with r11-7552-g3cb8aab390ccf31e4581863b080db30c6735e51e
fpext.i: In function ‘foo’:
fpext.i:6:3: internal compiler error: in gen_rtx_SUBREG, at emit-rtl.c:1023
    6 |   asm("" : : "f" (f0));
      |   ^~~
0xcbf9c2 gen_rtx_SUBREG(machine_mode, rtx_def*, poly_int<1u, unsigned long>)
        ../../gcc/emit-rtl.c:1023
0x1c0a54f gen_tf_to_fprx2(rtx_def*, rtx_def*)
        /usr/src/gcc-test/objz2/gcc/insn-emit.c:4851
0x1725bcb s390_md_asm_adjust
        ../../gcc/config/s390/s390.c:16786
0xb88cf4 expand_asm_stmt
        ../../gcc/cfgexpand.c:3424
0xb8a308 expand_gimple_stmt_1
        ../../gcc/cfgexpand.c:3841
0xb8a9af expand_gimple_stmt
        ../../gcc/cfgexpand.c:4008
0xb92fad expand_gimple_basic_block
        ../../gcc/cfgexpand.c:6045
0xb94da2 execute
        ../../gcc/cfgexpand.c:6729