native: implement `neg()` for arm64 (#14745)

2022-06-12 08:42:39 +02:00 · 2022-06-12 08:42:39 +02:00 · 5c104cf981
parent 8fa1e30dd2
commit 5c104cf981
1 changed files with 13 additions and 0 deletions
--- a/vlib/v/gen/native/arm64.v
+++ b/vlib/v/gen/native/arm64.v
@ -77,6 +77,19 @@ fn (mut g Gen) mov_arm(reg Arm64Register, val u64) {
 	*/
 }

+fn (mut g Gen) neg_arm(r Arm64Register) {
+	g.neg_regs_arm(r, r)
+}
+
+fn (mut g Gen) neg_regs_arm(a Arm64Register, b Arm64Register) {
+	if int(a) < 0x0f && int(b) < 0x0f {
+		g.write32(0xe2600000 | int(a) << 16 | int(b) << 12)
+		g.println('neg $a, $b')
+	} else {
+		g.n_error('unhandled neg $a, $b')
+	}
+}
+
 pub fn (mut g Gen) fn_decl_arm64(node ast.FnDecl) {
 	g.gen_arm64_helloworld()
 	// TODO