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authorLuis Pires <luis.pires@eldorado.org.br>2021-10-29 16:24:03 -0300
committerDavid Gibson <david@gibson.dropbear.id.au>2021-11-09 10:32:52 +1100
commit727385c4e13e1a5a985124a20a2370855141111d (patch)
treefd30395145becf57fc15c55fb4cb3ed2e6fce81a /libdecnumber
parent8bdb760606dadf6b7454aac84f214bb0f2c80654 (diff)
libdecnumber: introduce decNumberFrom[U]Int128
This will be used to implement PowerPC's dcffixqq. Signed-off-by: Luis Pires <luis.pires@eldorado.org.br> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20211029192417.400707-2-luis.pires@eldorado.org.br> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Diffstat (limited to 'libdecnumber')
-rw-r--r--libdecnumber/decNumber.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/libdecnumber/decNumber.c b/libdecnumber/decNumber.c
index 1ffe458ad8..d7716ce175 100644
--- a/libdecnumber/decNumber.c
+++ b/libdecnumber/decNumber.c
@@ -167,6 +167,7 @@
/* ------------------------------------------------------------------ */
#include "qemu/osdep.h"
+#include "qemu/host-utils.h"
#include "libdecnumber/dconfig.h"
#include "libdecnumber/decNumber.h"
#include "libdecnumber/decNumberLocal.h"
@@ -462,6 +463,41 @@ decNumber *decNumberFromUInt64(decNumber *dn, uint64_t uin)
return dn;
} /* decNumberFromUInt64 */
+decNumber *decNumberFromInt128(decNumber *dn, uint64_t lo, int64_t hi)
+{
+ uint64_t unsig_hi = hi;
+ if (hi < 0) {
+ if (lo == 0) {
+ unsig_hi = -unsig_hi;
+ } else {
+ unsig_hi = ~unsig_hi;
+ lo = -lo;
+ }
+ }
+
+ decNumberFromUInt128(dn, lo, unsig_hi);
+ if (hi < 0) {
+ dn->bits = DECNEG; /* sign needed */
+ }
+ return dn;
+} /* decNumberFromInt128 */
+
+decNumber *decNumberFromUInt128(decNumber *dn, uint64_t lo, uint64_t hi)
+{
+ uint64_t rem;
+ Unit *up; /* work pointer */
+ decNumberZero(dn); /* clean */
+ if (lo == 0 && hi == 0) {
+ return dn; /* [or decGetDigits bad call] */
+ }
+ for (up = dn->lsu; hi > 0 || lo > 0; up++) {
+ rem = divu128(&lo, &hi, DECDPUNMAX + 1);
+ *up = (Unit)rem;
+ }
+ dn->digits = decGetDigits(dn->lsu, up - dn->lsu);
+ return dn;
+} /* decNumberFromUInt128 */
+
/* ------------------------------------------------------------------ */
/* to-int64 -- conversion to int64 */
/* */