fix vector regs in test case

Author: androm3da

tests/ui/asm/hexagon-register-pairs.rs

@@ -1,5 +1,5 @@
 //@ add-core-stubs
-//@ compile-flags: --target hexagon-unknown-linux-musl
+//@ compile-flags: --target hexagon-unknown-linux-musl -C target-feature=+hvx-length128b
 //@ needs-llvm-components: hexagon
 
 #![feature(no_core, asm_experimental_arch)]
@@ -20,12 +20,12 @@ fn test_register_spans() {
         asm!("r15:14 = memd(r30+#8)", lateout("r14") _, lateout("r15") _);
         asm!("memd(r29+#0) = r5:4", in("r4") 0u32, in("r5") 0u32);
 
-        // Vector register pairs (hypothetical since we can't actually use them without HVX)
-        asm!("nop // V5:4 = vadd(V3:2, V1:0)"); // Comment form to avoid actual instruction issues
-        asm!("nop // V7:6.w = vadd(V5:4.w, V3:2.w)"); // With type suffixes
+        // Vector register pairs
+        asm!("V5:4 = vadd(V3:2, V1:0)", out("v4") _, out("v5") _);
+        asm!("V7:6.w = vadd(V5:4.w, V3:2.w)", in("v4") _, in("v5") _, out("v6") _, out("v7") _);
 
         // Predicate register pairs
-        asm!("nop // p1:0 = vcmpb.eq(V1:0, V3:2)"); // Comment form
+        asm!("p1:0 = vcmpb.eq(V1:0, V3:2)", in("v1") _, in("v2") _, in("v3") _, in("v4") _, out("p0") _, out("p1") _);
 
         // Mixed with actual labels should still trigger for the labels
         asm!("label1: r7:6 = combine(#2, #3)"); //~ ERROR avoid using named labels