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authorandrew <andrew@FreeBSD.org>2012-07-30 10:58:13 +0000
committerandrew <andrew@FreeBSD.org>2012-07-30 10:58:13 +0000
commitcfeab007a554034f0b3ab4a677cf9dd2696c12f9 (patch)
tree40cc44a3d02ed86de24f2117a55680e4f0eb01a0 /lib/divsi3.c
parent07af089f1449ec5506ca7ede5b593e11a0f48603 (diff)
downloadFreeBSD-src-cfeab007a554034f0b3ab4a677cf9dd2696c12f9.zip
FreeBSD-src-cfeab007a554034f0b3ab4a677cf9dd2696c12f9.tar.gz
Import compiler-rt r160957.
Diffstat (limited to 'lib/divsi3.c')
-rw-r--r--lib/divsi3.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/lib/divsi3.c b/lib/divsi3.c
index 0d81cb8..cd19de9 100644
--- a/lib/divsi3.c
+++ b/lib/divsi3.c
@@ -18,7 +18,7 @@ su_int COMPILER_RT_ABI __udivsi3(su_int n, su_int d);
/* Returns: a / b */
-ARM_EABI_FNALIAS(idiv, divsi3);
+ARM_EABI_FNALIAS(idiv, divsi3)
COMPILER_RT_ABI si_int
__divsi3(si_int a, si_int b)
@@ -29,5 +29,11 @@ __divsi3(si_int a, si_int b)
a = (a ^ s_a) - s_a; /* negate if s_a == -1 */
b = (b ^ s_b) - s_b; /* negate if s_b == -1 */
s_a ^= s_b; /* sign of quotient */
- return (__udivsi3(a, b) ^ s_a) - s_a; /* negate if s_a == -1 */
+ /*
+ * On CPUs without unsigned hardware division support,
+ * this calls __udivsi3 (notice the cast to su_int).
+ * On CPUs with unsigned hardware division support,
+ * this uses the unsigned division instruction.
+ */
+ return ((su_int)a/(su_int)b ^ s_a) - s_a; /* negate if s_a == -1 */
}
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