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master efb5115 1/2: Omit timestamp optimization invalid on 387 FPU
From: |
Paul Eggert |
Subject: |
master efb5115 1/2: Omit timestamp optimization invalid on 387 FPU |
Date: |
Thu, 19 Mar 2020 03:11:21 -0400 (EDT) |
branch: master
commit efb5115ba29d75e1227e36da3d92dc2f5c5b6257
Author: Paul Eggert <address@hidden>
Commit: Paul Eggert <address@hidden>
Omit timestamp optimization invalid on 387 FPU
* src/timefns.c (frac_to_double): Omit optimization that is
invalid on machines with excess precision (e.g., gcc x86 with 387
FPU), because it double-rounds. Found via ‘gcc -m32’ on x86-64.
---
src/timefns.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/src/timefns.c b/src/timefns.c
index 404ce49..a9595b5 100644
--- a/src/timefns.c
+++ b/src/timefns.c
@@ -611,9 +611,6 @@ frac_to_double (Lisp_Object numerator, Lisp_Object
denominator)
ptrdiff_t ndig = mpz_sizeinbase (*n, FLT_RADIX);
ptrdiff_t ddig = mpz_sizeinbase (*d, FLT_RADIX);
- if (FASTER_TIMEFNS && ndig <= DBL_MANT_DIG && ddig <= DBL_MANT_DIG)
- return mpz_get_d (*n) / mpz_get_d (*d);
-
/* Scale with SCALE when doing integer division. That is, compute
(N * FLT_RADIX**SCALE) / D [or, if SCALE is negative, N / (D *
FLT_RADIX**-SCALE)] as a bignum, convert the bignum to double,