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ff48ea6787
glibc/soft-fp
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Zong Li ff48ea6787 soft-fp: Use temporary variable in FP_FRAC_SUB_3/FP_FRAC_SUB_4 
In FRAC_SUB_3(R, X, Y) and FRAC_SUB_4(R,, X, Y), it reference both
the X[N] and X[N] after R[N] have been set. If one of the X and Y is
the same address with R, the result of the calculation is wrong,
because the value of the original X and Y are overwritten.

In glibc, there are two places use FRAC_SUB and occurs the overlap.
The first is _FP_DIV_MEAT_N_loop in op-common.h, it uses the source
_FP_DIV_MEAT_N_loop_u as the destination. This macro only be used
when N is one(_FP_DIV_MEAT_1_loop) and then the _FP_FRAC_SUB_##wc
extend to _FP_FRAC_SUB_1 in this macro. so it also work because
_FP_FRAC_SUB_1 has no overlap problem in its implementation.
The second places is _FP_DIV_MEAT_4_udiv, the original value of X##_f[0]
is overwritten before the calculatation.

In FRAC_SUB_1 and FRAC_SUB_2, there don't refer the source after
destination have been set, so they have no problem.

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

	* soft-fp/op-4.h (_FP_FRAC_SUB_3, _FP_FRAC_SUB_4): Use temporary
	variable to avoid overlap arguments.
2018-11-01 17:34:39 +00:00
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double.h Do not use packed structures in soft-fp. 2018-02-01 20:44:49 +00:00
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Makefile Make powerpc-nofpu __sqrtsf2, __sqrtdf2 compat symbols (bug 18473). 2018-06-01 17:25:12 +00:00
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op-4.h soft-fp: Use temporary variable in FP_FRAC_SUB_3/FP_FRAC_SUB_4 2018-11-01 17:34:39 +00:00
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op-common.h Add narrowing multiply functions. 2018-05-16 00:05:28 +00:00
quad.h Do not use packed structures in soft-fp. 2018-02-01 20:44:49 +00:00
single.h Do not use packed structures in soft-fp. 2018-02-01 20:44:49 +00:00
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