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From: "acoplan at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/98766] New: SVE: ICE in tree_to_shwi with -O3
 --param=avoid-fma-max-bits
Date: Wed, 20 Jan 2021 12:02:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98766

            Bug ID: 98766
           Summary: SVE: ICE in tree_to_shwi with -O3
                    --param=3Davoid-fma-max-bits
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: acoplan at gcc dot gnu.org
  Target Milestone: ---

The following fails:

$ cat test.c
extern int a[];
void c(short *d) {
  for (int e =3D 0; e < 9; e++)
    a[e] =3D d[e] * 2;
}
$ aarch64-elf-gcc -c test.c -march=3Darmv8.2-a+sve -O3
--param=3Davoid-fma-max-bits=3D8
during GIMPLE pass: widening_mul
test.c: In function 'c':
test.c:2:6: internal compiler error: in tree_to_shwi, at tree.c:7448
    2 | void c(short *d) {
      |      ^
0x11684f0 tree_to_shwi(tree_node const*)
        /home/alecop01/toolchain/src/gcc/gcc/tree.c:7448
0xfd97c1 convert_mult_to_fma
        /home/alecop01/toolchain/src/gcc/gcc/tree-ssa-math-opts.c:3255
0xfda040 after_dom_children
        /home/alecop01/toolchain/src/gcc/gcc/tree-ssa-math-opts.c:4619
0x19d3d80 dom_walker::walk(basic_block_def*)
        /home/alecop01/toolchain/src/gcc/gcc/domwalk.c:352
0xfd3731 execute
        /home/alecop01/toolchain/src/gcc/gcc/tree-ssa-math-opts.c:4718
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.

Removing any one of the options makes the ICE go away. It appears to ICE at=
 any
nonzero valid value of the param (although I've not checked this exhaustive=
ly).=