https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111709
--- Comment #16 from John David Anglin <danglin at gcc dot gnu.org> --- Correct. I recently did a couple of updates to the test ulps and now only the fma tests fail when building glibc with PA 1.1 code. Don't know about PA 2.0. I noticed that some RISCV processors have problems with underflow. I adapted fdiv test to test glibc fma function: dave@atlas:~$ cat fma-repro.c #include <math.h> #include <fenv.h> #include <stdio.h> int main(void) { if (fesetround (FE_DOWNWARD)) { printf("ERROR: Failed to set rounding mode!\n"); return 1; } fma(-0x7.ffffffffffffp-1024, 0x8.0000000000008p-4, -0x4p-1076); if(fetestexcept (FE_UNDERFLOW)) { printf("Failure: Exception Underflow is set!\n"); } else { printf("Success: Exception Underflow is not set!!!\n"); } } dave@atlas:~$ gcc fma-repro.c -lm -std=c2x -o fma-repro -fno-builtin dave@atlas:~$ ./fma-repro Failure: Exception Underflow is set! Option -fno-builtin is needed to ensure fma call isn't optimized away. Test passes if it is optimized away.