diff options
Diffstat (limited to 'sysdeps/alpha/divq.S')
| -rw-r--r-- | sysdeps/alpha/divq.S | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/sysdeps/alpha/divq.S b/sysdeps/alpha/divq.S index cab6c34ad1..7f245ac056 100644 --- a/sysdeps/alpha/divq.S +++ b/sysdeps/alpha/divq.S @@ -33,7 +33,12 @@ When the dividend is outside the range for which we can compute exact results, we use the fp quotent as an estimate from which we begin refining an exact integral value. This reduces the number of iterations in the - shift-and-subtract loop significantly. */ + shift-and-subtract loop significantly. + + The FPCR save/restore is due to the fact that the EV6 _will_ set FPCR_INE + for cvttq/c even without /sui being set. It will not, however, properly + raise the exception, so we don't have to worry about FPCR_INED being clear + and so dying by SIGFPE. */ .text .align 4 @@ -53,10 +58,15 @@ __divq: ready -- all the time in the world to figure out how we're going to use the results. */ stt $f0, 0(sp) - stt $f1, 8(sp) + excb beq Y, DIVBYZERO + + stt $f1, 8(sp) + stt $f3, 48(sp) cfi_rel_offset ($f0, 0) cfi_rel_offset ($f1, 8) + cfi_rel_offset ($f3, 48) + mf_fpcr $f3 _ITOFT2 X, $f0, 16, Y, $f1, 24 cvtqt $f0, $f0 @@ -73,12 +83,16 @@ __divq: /* If we get here, we're expecting exact results from the division. Do nothing else besides convert and clean up. */ cvttq/c $f0, $f0 + excb + mt_fpcr $f3 _FTOIT $f0, RV, 16 ldt $f0, 0(sp) + ldt $f3, 48(sp) cfi_restore ($f1) cfi_remember_state cfi_restore ($f0) + cfi_restore ($f3) cfi_def_cfa_offset (0) lda sp, FRAME(sp) ret $31, (RA), 1 @@ -121,9 +135,9 @@ $fix_sign_in_ret2: cfi_rel_offset (t3, 0) mulq Q, Y, QY - unop + excb stq t4, 8(sp) - unop + mt_fpcr $f3 cfi_rel_offset (t4, 8) subq QY, X, R @@ -147,6 +161,7 @@ $fix_sign_out_ret: ldq t3, 0(sp) ldq t4, 8(sp) ldq t5, 40(sp) + ldt $f3, 48(sp) lda sp, FRAME(sp) cfi_remember_state cfi_restore (t0) @@ -155,6 +170,7 @@ $fix_sign_out_ret: cfi_restore (t3) cfi_restore (t4) cfi_restore (t5) + cfi_restore ($f3) cfi_def_cfa_offset (0) ret $31, (RA), 1 |