[X86][MC] Error out for CMPCCXADD on 32 bit targets. (#88672)

This resolves issue #88501.

Author: FreddyLeaf

llvm/lib/Target/X86/X86InstrAsmAlias.td

@@ -51,15 +51,17 @@ def : InstAlias<"invlpgb\t{%rax, %edx|rax, edx}", (INVLPGB64)>, Requires<[In64Bi
 
 // CMPCCXADD Instructions Alias
 multiclass CMPCCXADD_Aliases<string Cond, int CC> {
-  def : InstAlias<"cmp"#Cond#"xadd"#"\t{$src3, $dst, $dstsrc2|$dstsrc2, $dst, $src3}",
-                  (CMPCCXADDmr32 GR32:$dst, i32mem:$dstsrc2, GR32:$src3, CC), 0>;
-  def : InstAlias<"cmp"#Cond#"xadd"#"\t{$src3, $dst, $dstsrc2|$dstsrc2, $dst, $src3}",
-                  (CMPCCXADDmr64 GR64:$dst, i64mem:$dstsrc2, GR64:$src3, CC), 0>;
-
-  def : InstAlias<"cmp"#Cond#"xadd"#"\t{$src3, $dst, $dstsrc2|$dstsrc2, $dst, $src3}",
-                  (CMPCCXADDmr32_EVEX GR32:$dst, i32mem:$dstsrc2, GR32:$src3, CC), 0>;
-  def : InstAlias<"cmp"#Cond#"xadd"#"\t{$src3, $dst, $dstsrc2|$dstsrc2, $dst, $src3}",
-                  (CMPCCXADDmr64_EVEX GR64:$dst, i64mem:$dstsrc2, GR64:$src3, CC), 0>;
+  let Predicates = [In64BitMode] in {
+    def : InstAlias<"cmp"#Cond#"xadd"#"\t{$src3, $dst, $dstsrc2|$dstsrc2, $dst, $src3}",
+                    (CMPCCXADDmr32 GR32:$dst, i32mem:$dstsrc2, GR32:$src3, CC), 0>;
+    def : InstAlias<"cmp"#Cond#"xadd"#"\t{$src3, $dst, $dstsrc2|$dstsrc2, $dst, $src3}",
+                    (CMPCCXADDmr64 GR64:$dst, i64mem:$dstsrc2, GR64:$src3, CC), 0>;
+
+    def : InstAlias<"cmp"#Cond#"xadd"#"\t{$src3, $dst, $dstsrc2|$dstsrc2, $dst, $src3}",
+                    (CMPCCXADDmr32_EVEX GR32:$dst, i32mem:$dstsrc2, GR32:$src3, CC), 0>;
+    def : InstAlias<"cmp"#Cond#"xadd"#"\t{$src3, $dst, $dstsrc2|$dstsrc2, $dst, $src3}",
+                    (CMPCCXADDmr64_EVEX GR64:$dst, i64mem:$dstsrc2, GR64:$src3, CC), 0>;
+  }
 }
 
 // CCMP Instructions Alias

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

@@ -3,9 +3,9 @@
 
 # ERROR-COUNT-60: error:
 # ERROR-NOT: error:
-# CHECK: {evex}	cmpnbexadd	%ecx, %edx, 123(%rax,%rbx,4)
-# CHECK: encoding: [0x62,0xf2,0x75,0x08,0xe7,0x54,0x98,0x7b]
-         {evex}	cmpnbexadd	%ecx, %edx, 123(%rax,%rbx,4)
+# CHECK: {evex}	cmpnbexadd	%ecx, %edx, 123(%eax,%ebx,4)
+# CHECK: encoding: [0x67,0x62,0xf2,0x75,0x08,0xe7,0x54,0x98,0x7b]
+         {evex}	cmpnbexadd	%ecx, %edx, 123(%eax,%ebx,4)
 
 # CHECK: {evex}	cmpnbexadd	%r9, %r15, 123(%rax,%rbx,4)
 # CHECK: encoding: [0x62,0x72,0xb5,0x08,0xe7,0x7c,0x98,0x7b]

llvm/test/MC/X86/cmpccxadd-att-64-alias.s renamed to llvm/test/MC/X86/cmpccxadd-att-alias.s

@@ -1,4 +1,8 @@
 // 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-193: error:
+// ERROR-NOT: error:
 
 // CHECK: cmpbexadd  %eax, %ecx, 268435456(%rbp,%r14,8)
 // CHECK: encoding: [0xc4,0xa2,0x79,0xe6,0x8c,0xf5,0x00,0x00,0x00,0x10]
@@ -20,9 +24,9 @@
 // CHECK: encoding: [0xc4,0xe2,0x79,0xe6,0x89,0xfc,0x01,0x00,0x00]
           cmpbexadd  %eax, %ecx, 508(%rcx)
 
-// CHECK: cmpbexadd  %eax, %ecx, -512(%rdx)
-// CHECK: encoding: [0xc4,0xe2,0x79,0xe6,0x8a,0x00,0xfe,0xff,0xff]
-          cmpbexadd  %eax, %ecx, -512(%rdx)
+// CHECK: cmpbexadd  %eax, %ecx, -512(%edx)
+// CHECK: encoding: [0x67,0xc4,0xe2,0x79,0xe6,0x8a,0x00,0xfe,0xff,0xff]
+          cmpbexadd  %eax, %ecx, -512(%edx)
 
 // CHECK: cmpbexadd  %r10, %r9, 268435456(%rbp,%r14,8)
 // CHECK: encoding: [0xc4,0x22,0xa9,0xe6,0x8c,0xf5,0x00,0x00,0x00,0x10]