[Bug tree-optimization/116409] New: [15 Regression] Recent phiopt change causing ICE on riscv64

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116409

            Bug ID: 116409
           Summary: [15 Regression] Recent phiopt change causing ICE on
                    riscv64
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: law at gcc dot gnu.org
  Target Milestone: ---

riscv64 is failing to build glibc after the recent phiopt changes.



Using a riscv64-elf cross compiler:

./cc1 -O2 j.c -march=rv64gc -mabi=lp64d -frounding-math -fno-math-errno

j.c:8:1: internal compiler error: in factor_out_conditional_operation, at
tree-ssa-phiopt.cc:407

Naturally the recent phiopt change is suspect.

Reduced testcase:

double kernel_ax;
double sqrt();
double fma();
double kernel() {
  if (kernel_ax)
    return sqrt(fma());
  return sqrt(fma());
}