[PATCH 1/2] soft-fp: Fix overwritten issue for division in op-4.h

[Zong Li]

The original value of X##_f[0] is overwritten before the calculatation.

After this modification, we can pass the soft floating testing of glibc
testsuites on RV32.

	* soft-fp/op-4.h: Fix wrong calculation of division.
---
 ChangeLog      | 4 ++++
 soft-fp/op-4.h | 7 ++++++-
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/ChangeLog b/ChangeLog
index 2601765..bb30093 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2018-10-15  Zong Li  <zongbox@gmail.com>
+
+	* soft-fp/op-4.h: Fix wrong calculation of division.
+
 2018-10-14  Paul Eggert  <eggert@cs.ucla.edu>
 
 	regex: simplify by using intprops.h
diff --git a/soft-fp/op-4.h b/soft-fp/op-4.h
index 01b87d0..a407168 100644
--- a/soft-fp/op-4.h
+++ b/soft-fp/op-4.h
@@ -517,10 +517,15 @@
 	      R##_f[_FP_DIV_MEAT_4_udiv_i] = -1;			\
 	      if (!_FP_DIV_MEAT_4_udiv_i)				\
 		break;							\
-	      __FP_FRAC_SUB_4 (X##_f[3], X##_f[2], X##_f[1], X##_f[0],	\
+	      UWtype __FP_FRAC_tmp;					\
+	      __FP_FRAC_SUB_4 (X##_f[2], X##_f[1], X##_f[0], __FP_FRAC_tmp,	\
 			       Y##_f[2], Y##_f[1], Y##_f[0], 0,		\
 			       X##_f[2], X##_f[1], X##_f[0],		\
 			       _FP_DIV_MEAT_4_udiv_n_f[_FP_DIV_MEAT_4_udiv_i]); \
+	      X##_f[3] = X##_f[2];					\
+	      X##_f[2] = X##_f[1];					\
+	      X##_f[1] = X##_f[0];					\
+	      X##_f[0] = __FP_FRAC_tmp;					\
 	      _FP_FRAC_SUB_4 (X, Y, X);					\
 	      if (X##_f[3] > Y##_f[3])					\
 		{							\
-- 
2.7.4