diff options
Diffstat (limited to 'sysdeps')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/k_rem_pio2.c | 14 |
1 files changed, 5 insertions, 9 deletions
diff --git a/sysdeps/ieee754/dbl-64/k_rem_pio2.c b/sysdeps/ieee754/dbl-64/k_rem_pio2.c index 6e2ef5d07b..f75392525c 100644 --- a/sysdeps/ieee754/dbl-64/k_rem_pio2.c +++ b/sysdeps/ieee754/dbl-64/k_rem_pio2.c @@ -300,6 +300,11 @@ recompute: iq[jz] = (int32_t) z; } + /* jz is always nonnegative here, because the result is never zero to + full precision (this function is not called for zero arguments). + Help the compiler to know it. */ + if (jz < 0) __builtin_unreachable (); + /* convert integer "bit" chunk to floating-point value */ fw = __scalbn (one, q0); for (i = jz; i >= 0; i--) @@ -330,16 +335,7 @@ recompute: for (i = jz; i >= 0; i--) fv = math_narrow_eval (fv + fq[i]); y[0] = (ih == 0) ? fv : -fv; - /* GCC mainline (to be GCC 9), as of 2018-05-22 on i686, warns - that fq[0] may be used uninitialized. This is not possible - because jz is always nonnegative when the above loop - initializing fq is executed, because the result is never zero - to full precision (this function is not called for zero - arguments). */ - DIAG_PUSH_NEEDS_COMMENT; - DIAG_IGNORE_NEEDS_COMMENT (9, "-Wmaybe-uninitialized"); fv = math_narrow_eval (fq[0] - fv); - DIAG_POP_NEEDS_COMMENT; for (i = 1; i <= jz; i++) fv = math_narrow_eval (fv + fq[i]); y[1] = (ih == 0) ? fv : -fv; |