machinst x64: implement bsr and lower Clz;

2020-07-03 17:11:03 +02:00
parent eda2d143ed
commit ec2209665a
5 changed files with 210 additions and 39 deletions
--- a/cranelift/codegen/src/isa/x64/inst/emit_tests.rs
+++ b/cranelift/codegen/src/isa/x64/inst/emit_tests.rs
@@ -1154,6 +1154,20 @@ fn test_x64_emit() {
        "imull   $76543210, %esi",
    ));

+    // ========================================================
+    // ReadOnly_Gpr_Rm_R
+
+    insns.push((
+        Inst::read_only_gpr_rm_r(4, ReadOnlyGprRmROpcode::Bsr, RegMem::reg(rsi), w_rdi),
+        "0FBDFE",
+        "bsrl    %esi, %edi",
+    ));
+    insns.push((
+        Inst::read_only_gpr_rm_r(8, ReadOnlyGprRmROpcode::Bsr, RegMem::reg(r15), w_rax),
+        "490FBDC7",
+        "bsrq    %r15, %rax",
+    ));
+
    // ========================================================
    // Div
    insns.push((