diff options
Diffstat (limited to 'sysdeps/alpha/divqu.S')
| -rw-r--r-- | sysdeps/alpha/divqu.S | 32 |
1 files changed, 25 insertions, 7 deletions
diff --git a/sysdeps/alpha/divqu.S b/sysdeps/alpha/divqu.S index 63b575faa7..fc00fa133c 100644 --- a/sysdeps/alpha/divqu.S +++ b/sysdeps/alpha/divqu.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 @@ __divqu: 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 @@ -65,10 +75,7 @@ __divqu: divt/c $f0, $f1, $f0 /* Check to see if Y was mis-converted as signed value. */ - .align 4 ldt $f1, 8(sp) - unop - nop blt Y, $y_is_neg /* Check to see if X fit in the double as an exact value. */ @@ -78,11 +85,16 @@ __divqu: /* 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 $f3, 48(sp) cfi_remember_state cfi_restore ($f0) cfi_restore ($f1) + cfi_restore ($f3) cfi_def_cfa_offset (0) lda sp, FRAME(sp) ret $31, (RA), 1 @@ -140,9 +152,9 @@ $x_big: .align 4 stq t4, 8(sp) - unop + excb ldt $f0, 0(sp) - unop + mt_fpcr $f3 cfi_rel_offset (t4, 8) cfi_restore ($f0) @@ -164,6 +176,7 @@ $q_low_ret: ldq t2, 32(sp) ldq t3, 40(sp) + ldt $f3, 48(sp) lda sp, FRAME(sp) cfi_remember_state cfi_restore (t0) @@ -171,6 +184,7 @@ $q_low_ret: cfi_restore (t2) cfi_restore (t3) cfi_restore (t4) + cfi_restore ($f3) cfi_def_cfa_offset (0) ret $31, (RA), 1 @@ -227,9 +241,13 @@ $y_is_neg: from the divide will be completely wrong. Fortunately, the quotient must be either 0 or 1, so just compute it directly. */ cmpult Y, X, RV + excb + mt_fpcr $f3 ldt $f0, 0(sp) + ldt $f3, 48(sp) lda sp, FRAME(sp) cfi_restore ($f0) + cfi_restore ($f3) cfi_def_cfa_offset (0) ret $31, (RA), 1 |