as3525: find_first_set_bit() isn't built in bootloaders

We assume only one bit is set and use clz to find the most significant
set bit, if there's more than one bit set we'll see it in the panic msg

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26285 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 1 insertions, 1 deletions

diff --git a/firmware/target/arm/as3525/system-as3525.c b/firmware/target/arm/as3525/system-as3525.c
index f215300f75..8a04507385 100644
--- a/firmware/target/arm/as3525/system-as3525.c
+++ b/firmware/target/arm/as3525/system-as3525.c
@@ -98,7 +98,7 @@ static void UIRQ(void)
     if(status == 0)
         panicf("Unhandled IRQ (source unknown!)");
 
-    unsigned irq_no = find_first_set_bit(status);
+    unsigned irq_no = 31 - __builtin_clz(status);
 
     panicf("Unhandled %smasked IRQ %02X: %s (status 0x%8X)",
            masked ? "" : "no", irq_no, irqname[irq_no], status);