procedures

1 files changed, 37 insertions, 0 deletions

diff --git a/3/6_control/30_switch2.c b/3/6_control/30_switch2.c
new file mode 100644
index 0000000..0c8cc85
--- /dev/null
+++ b/3/6_control/30_switch2.c
@@ -0,0 +1,37 @@
+#include <stdio.h>
+
+// x in %rdi
+// switch2:
+//   addq   $1, %rdi
+//   cmpq   $8, %rdi
+//   ja     .L2     if (x + 1) > 8 then goto default
+//   jmp    *.L4(,%rdi,8)   take the address at x*8 from .L4
+void switch2(long x, long *dest) {
+    long val = 0;
+    switch (x) {
+        case -1:
+            printf(".L9");
+            break;
+        case 0:
+        case 7:
+            printf(".L5");
+            break;
+        case 1:
+            printf(".L6");
+            break;
+        case 2:
+        case 4:
+            printf(".L7");
+            break;
+        case 5:
+            printf(".L8");
+            break;
+
+    }
+    *dest = val;
+}
+
+int main(void) {
+    printf("val: %ld\n");
+    return 0;
+}