[X86][APX] Fix wrong encoding of promoted KMOV instructions due to missing NoCD8 (#109579)

Promoted KMOV* was encoded with CD8 incorrectly, see
https://godbolt.org/z/cax513hG1

Author: phoebewang

llvm/lib/Target/X86/X86InstrAVX512.td

@@ -2617,19 +2617,20 @@ defm VFPCLASS : avx512_fp_fpclass_all<"vfpclass", 0x66, 0x67, SchedWriteFCmp>, E
 multiclass avx512_mask_mov<bits<8> opc_kk, bits<8> opc_km, bits<8> opc_mk,
                           string OpcodeStr, RegisterClass KRC, ValueType vvt,
                           X86MemOperand x86memop, string Suffix = ""> {
-  let isMoveReg = 1, hasSideEffects = 0, SchedRW = [WriteMove],
-      explicitOpPrefix = !if(!eq(Suffix, ""), NoExplicitOpPrefix, ExplicitEVEX) in
-  def kk#Suffix : I<opc_kk, MRMSrcReg, (outs KRC:$dst), (ins KRC:$src),
-                    !strconcat(OpcodeStr, "\t{$src, $dst|$dst, $src}"), []>,
-                  Sched<[WriteMove]>;
-  def km#Suffix : I<opc_km, MRMSrcMem, (outs KRC:$dst), (ins x86memop:$src),
-                    !strconcat(OpcodeStr, "\t{$src, $dst|$dst, $src}"),
-                    [(set KRC:$dst, (vvt (load addr:$src)))]>,
-                  Sched<[WriteLoad]>;
-  def mk#Suffix : I<opc_mk, MRMDestMem, (outs), (ins x86memop:$dst, KRC:$src),
-                    !strconcat(OpcodeStr, "\t{$src, $dst|$dst, $src}"),
-                    [(store KRC:$src, addr:$dst)]>,
-                  Sched<[WriteStore]>;
+  let explicitOpPrefix = !if(!eq(Suffix, ""), NoExplicitOpPrefix, ExplicitEVEX) in {
+    let isMoveReg = 1, hasSideEffects = 0, SchedRW = [WriteMove] in
+    def kk#Suffix : I<opc_kk, MRMSrcReg, (outs KRC:$dst), (ins KRC:$src),
+                      !strconcat(OpcodeStr, "\t{$src, $dst|$dst, $src}"), []>,
+                    Sched<[WriteMove]>;
+    def km#Suffix : I<opc_km, MRMSrcMem, (outs KRC:$dst), (ins x86memop:$src),
+                      !strconcat(OpcodeStr, "\t{$src, $dst|$dst, $src}"),
+                      [(set KRC:$dst, (vvt (load addr:$src)))]>,
+                    Sched<[WriteLoad]>, NoCD8;
+    def mk#Suffix : I<opc_mk, MRMDestMem, (outs), (ins x86memop:$dst, KRC:$src),
+                      !strconcat(OpcodeStr, "\t{$src, $dst|$dst, $src}"),
+                      [(store KRC:$src, addr:$dst)]>,
+                    Sched<[WriteStore]>, NoCD8;
+  }
 }
 
 multiclass avx512_mask_mov_gpr<bits<8> opc_kr, bits<8> opc_rk,

llvm/test/MC/Disassembler/X86/apx/kmov.txt

@@ -17,6 +17,22 @@
 # INTEL: {evex} kmovq	k2, k1
 0x62,0xf1,0xfc,0x08,0x90,0xd1
 
+# ATT:   {evex} kmovb   -16(%rax), %k0
+# INTEL: {evex} kmovb   k0, byte ptr [rax - 16]
+0x62,0xf1,0x7d,0x08,0x90,0x40,0xf0
+
+# ATT:   {evex} kmovw   -16(%rax), %k0
+# INTEL: {evex} kmovw   k0, word ptr [rax - 16]
+0x62,0xf1,0x7c,0x08,0x90,0x40,0xf0
+
+# ATT:   {evex} kmovd   -16(%rax), %k0
+# INTEL: {evex} kmovd   k0, dword ptr [rax - 16]
+0x62,0xf1,0xfd,0x08,0x90,0x40,0xf0
+
+# ATT:   {evex} kmovq   -16(%rax), %k0
+# INTEL: {evex} kmovq   k0, qword ptr [rax - 16]
+0x62,0xf1,0xfc,0x08,0x90,0x40,0xf0
+
 # ATT-NOT: {evex}
 # INTEL-NOT: {evex}
 

llvm/test/MC/X86/apx/kmov-att.s

@@ -1,7 +1,7 @@
 # RUN: llvm-mc -triple x86_64 -show-encoding %s | FileCheck %s
 # RUN: not llvm-mc -triple i386 -show-encoding %s 2>&1 | FileCheck %s --check-prefix=ERROR
 
-# ERROR-COUNT-20: error:
+# ERROR-COUNT-24: error:
 # ERROR-NOT: error:
 # CHECK: {evex}	kmovb	%k1, %k2
 # CHECK: encoding: [0x62,0xf1,0x7d,0x08,0x90,0xd1]
@@ -15,6 +15,18 @@
 # CHECK: {evex}	kmovq	%k1, %k2
 # CHECK: encoding: [0x62,0xf1,0xfc,0x08,0x90,0xd1]
          {evex}	kmovq	%k1, %k2
+# CHECK: {evex} kmovb   -16(%rax), %k0
+# CHECK: encoding: [0x62,0xf1,0x7d,0x08,0x90,0x40,0xf0]
+         {evex} kmovb   -0x10(%rax), %k0
+# CHECK: {evex} kmovw   -16(%rax), %k0
+# CHECK: encoding: [0x62,0xf1,0x7c,0x08,0x90,0x40,0xf0]
+         {evex} kmovw   -0x10(%rax), %k0
+# CHECK: {evex} kmovd   -16(%rax), %k0
+# CHECK: encoding: [0x62,0xf1,0xfd,0x08,0x90,0x40,0xf0]
+         {evex} kmovd   -0x10(%rax), %k0
+# CHECK: {evex} kmovq   -16(%rax), %k0
+# CHECK: encoding: [0x62,0xf1,0xfc,0x08,0x90,0x40,0xf0]
+         {evex} kmovq   -0x10(%rax), %k0
 
 # CHECK-NOT: {evex}
 

llvm/test/MC/X86/apx/kmov-intel.s

@@ -12,6 +12,18 @@
 # CHECK: {evex}	kmovq	k2, k1
 # CHECK: encoding: [0x62,0xf1,0xfc,0x08,0x90,0xd1]
          {evex}	kmovq	k2, k1
+# CHECK: {evex} kmovb   k0, byte ptr [rax - 16]
+# CHECK: encoding: [0x62,0xf1,0x7d,0x08,0x90,0x40,0xf0]
+         {evex} kmovb   k0, byte ptr [rax - 0x10]
+# CHECK: {evex} kmovw   k0, word ptr [rax - 16]
+# CHECK: encoding: [0x62,0xf1,0x7c,0x08,0x90,0x40,0xf0]
+         {evex} kmovw   k0, word ptr [rax - 0x10]
+# CHECK: {evex} kmovd   k0, dword ptr [rax - 16]
+# CHECK: encoding: [0x62,0xf1,0xfd,0x08,0x90,0x40,0xf0]
+         {evex} kmovd   k0, dword ptr [rax - 0x10]
+# CHECK: {evex} kmovq   k0, qword ptr [rax - 16]
+# CHECK: encoding: [0x62,0xf1,0xfc,0x08,0x90,0x40,0xf0]
+         {evex} kmovq   k0, qword ptr [rax - 0x10]
 
 # CHECK-NOT: {evex}