[llvm] [X86][dec] Handle EVEX.W = 1 and EVEX.pp = 01 (PR #103816)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-backend-x86

@llvm/pr-subscribers-mc

Author: Freddy Ye (FreddyLeaf)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/103816.diff


2 Files Affected:

- (modified) llvm/test/MC/Disassembler/X86/apx/imul.txt (+5) 
- (modified) llvm/utils/TableGen/X86DisassemblerTables.cpp (+1) 


``````````diff
diff --git a/llvm/test/MC/Disassembler/X86/apx/imul.txt b/llvm/test/MC/Disassembler/X86/apx/imul.txt
index f72a6f4aec8f92..9fed5dfafdc80e 100644
--- a/llvm/test/MC/Disassembler/X86/apx/imul.txt
+++ b/llvm/test/MC/Disassembler/X86/apx/imul.txt
@@ -21,6 +21,11 @@
 # INTEL: {evex}	imul	r9, r9, 123
 0x62,0x54,0xfc,0x08,0x6b,0xc9,0x7b
 
+# iOSize=64 when EVEX.W = 1 and EVEX.pp = 01
+# ATT:   {evex}	imulq	$123, %r9, %r9
+# INTEL: {evex}	imul	r9, r9, 123
+0x62,0x54,0xfd,0x08,0x6b,0xc9,0x7b
+
 # ATT:   {nf}	imulq	$123, %r9, %r9
 # INTEL: {nf}	imul	r9, r9, 123
 0x62,0x54,0xfc,0x0c,0x6b,0xc9,0x7b
diff --git a/llvm/utils/TableGen/X86DisassemblerTables.cpp b/llvm/utils/TableGen/X86DisassemblerTables.cpp
index 21c5e3297b23f6..876cbf9eccd0f7 100644
--- a/llvm/utils/TableGen/X86DisassemblerTables.cpp
+++ b/llvm/utils/TableGen/X86DisassemblerTables.cpp
@@ -268,6 +268,7 @@ static inline bool inheritsFrom(InstructionContext child,
            (VEX_LIG && inheritsFrom(child, IC_EVEX_L2_OPSIZE_KZ));
   case IC_EVEX_W:
     return (VEX_LIG && inheritsFrom(child, IC_EVEX_L_W)) ||
+           inheritsFrom(child, IC_EVEX_W_OPSIZE) ||
            (VEX_LIG && inheritsFrom(child, IC_EVEX_L2_W));
   case IC_EVEX_W_XS:
     return (VEX_LIG && inheritsFrom(child, IC_EVEX_L_W_XS)) ||

``````````

</details>


https://github.com/llvm/llvm-project/pull/103816