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-rw-r--r--libm/kvx/feupdateenv.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/libm/kvx/feupdateenv.c b/libm/kvx/feupdateenv.c
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+++ b/libm/kvx/feupdateenv.c
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+/*
+ (C) Copyright 2019 Kalray S.A.
+ This file provides feupdateenv for the Coolidge processor.
+*/
+
+#include <fenv.h>
+
+int feupdateenv(const fenv_t *envp)
+{
+ /* Mask *envp to be sure only valid bits are set */
+ fenv_t fe = *envp;
+ fe &= (FE_ALL_EXCEPT|FE_RND_MASK);
+
+ /* Update exception flags and rounding mode bit-fields of $cs, with
+ 'fe' as a set mask and FE_RND_MASK as a clear mask. FE_ALL_EXCEPT
+ is not cleared: restores rounding mode and updates exception
+ flags. */
+ __builtin_kvx_wfxl(KVX_SFR_CS, ((long long)fe << 32) | FE_RND_MASK);
+
+ /* The above insn cannot fail (while the OS allows access to the
+ floating-point exception flags of the $cs register). Return
+ success. */
+ return 0;
+}