[llvm-branch-commits] [llvm] release/19.x: [X86][APX] Do not emit {evex} prefix for memory variant (#109759) (PR #109767)

[via llvm-branch-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-mc

Author: None (llvmbot)

<details>
<summary>Changes</summary>

Backport 0d334d83a4c7ce16fa1bc0e5e56bbdeaf01c2b2d 70529b24a30943d46e361d2990268499921e28a2

Requested by: @<!-- -->phoebewang

---
Full diff: https://github.com/llvm/llvm-project/pull/109767.diff


4 Files Affected:

- (modified) llvm/lib/Target/X86/X86InstrAVX512.td (+2-2) 
- (modified) llvm/test/MC/Disassembler/X86/apx/kmov.txt (+16) 
- (modified) llvm/test/MC/X86/apx/kmov-att.s (+13-1) 
- (modified) llvm/test/MC/X86/apx/kmov-intel.s (+12) 


``````````diff
diff --git a/llvm/lib/Target/X86/X86InstrAVX512.td b/llvm/lib/Target/X86/X86InstrAVX512.td
index da690aea43f5c0..cc1f9090c11acc 100644
--- a/llvm/lib/Target/X86/X86InstrAVX512.td
+++ b/llvm/lib/Target/X86/X86InstrAVX512.td
@@ -2625,11 +2625,11 @@ multiclass avx512_mask_mov<bits<8> opc_kk, bits<8> opc_km, bits<8> opc_mk,
   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:$src)))]>,
-                  Sched<[WriteLoad]>;
+                  Sched<[WriteLoad]>, NoCD8;
   def mk#Suffix : I<opc_mk, MRMDestMem, (outs), (ins x86memop:$dst, KRC:$src),
                     !strconcat(OpcodeStr, "\t{$src, $dst|$dst, $src}"),
                     [(store KRC:$src, addr:$dst)]>,
-                  Sched<[WriteStore]>;
+                  Sched<[WriteStore]>, NoCD8;
 }
 
 multiclass avx512_mask_mov_gpr<bits<8> opc_kr, bits<8> opc_rk,
diff --git a/llvm/test/MC/Disassembler/X86/apx/kmov.txt b/llvm/test/MC/Disassembler/X86/apx/kmov.txt
index 5d947ff39f2314..ba77dda64e59f5 100644
--- a/llvm/test/MC/Disassembler/X86/apx/kmov.txt
+++ b/llvm/test/MC/Disassembler/X86/apx/kmov.txt
@@ -17,6 +17,22 @@
 # INTEL: {evex} kmovq	k2, k1
 0x62,0xf1,0xfc,0x08,0x90,0xd1
 
+# ATT:   kmovb	-16(%rax), %k0
+# INTEL: kmovb	k0, byte ptr [rax - 16]
+0x62,0xf1,0x7d,0x08,0x90,0x40,0xf0
+
+# ATT:   kmovw	-16(%rax), %k0
+# INTEL: kmovw	k0, word ptr [rax - 16]
+0x62,0xf1,0x7c,0x08,0x90,0x40,0xf0
+
+# ATT:   kmovd	-16(%rax), %k0
+# INTEL: kmovd	k0, dword ptr [rax - 16]
+0x62,0xf1,0xfd,0x08,0x90,0x40,0xf0
+
+# ATT:   kmovq	-16(%rax), %k0
+# INTEL: kmovq	k0, qword ptr [rax - 16]
+0x62,0xf1,0xfc,0x08,0x90,0x40,0xf0
+
 # ATT-NOT: {evex}
 # INTEL-NOT: {evex}
 
diff --git a/llvm/test/MC/X86/apx/kmov-att.s b/llvm/test/MC/X86/apx/kmov-att.s
index 949ef65be98d4c..5f59e0a505b235 100644
--- a/llvm/test/MC/X86/apx/kmov-att.s
+++ b/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}
 
diff --git a/llvm/test/MC/X86/apx/kmov-intel.s b/llvm/test/MC/X86/apx/kmov-intel.s
index 0cdbd310062eba..51cec67caf9a04 100644
--- a/llvm/test/MC/X86/apx/kmov-intel.s
+++ b/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}
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/109767