backend: don't mixup float and int temps

copy propagation only happens when dataclasses match, register allocator
ignores hints if hint register class and instruction class differ, also
add mov between int and float regs in amd64/emit

1 files changed, 11 insertions, 0 deletions

diff --git a/test/fib.c b/test/fib.c
index eadce03..5fe430a 100644
--- a/test/fib.c
+++ b/test/fib.c
@@ -13,6 +13,16 @@ unsigned fibr(unsigned x) {
    return fibr(x-1) + fibr(x-2);
 }
 
+double fibf(unsigned x) {
+   double r = 0., q = 1.;
+   while (x-- > 1) {
+      double s = r + q;
+      r = q;
+      q = s;
+   }
+   return q;
+}
+
 int atoi(const char *);
 int printf(const char *, ...);
 
@@ -20,6 +30,7 @@ int main(int argc, char **argv) {
    unsigned n = argv[1] ? atoi(argv[1]) : 10;
    printf("fib(%u)  = %u\n", n, fib(n));
    printf("fibr(%u) = %u\n", n, fibr(n));
+   printf("fibf(%u) = %g\n", n, fibf(n));
 }
 
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