[X86][MC] Intel syntax: accept implicit memory operand sizes larger than 80.

The X86AsmParser intel handling was refactored in r216481, making it
try each different memory operand size to see which one matches.
Operand sizes larger than 80 ("[xyz]mmword ptr") were forgotten, which
led to an "invalid operand" error for code such as:
  movdqa [rax], xmm0

llvm-svn: 223187

2 files changed, 27 insertions, 1 deletions

diff --git a/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp b/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
index 8ef2a5558da..65ceb620f0a 100644
--- a/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
+++ b/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
@@ -2626,7 +2626,7 @@ bool X86AsmParser::MatchAndEmitIntelInstruction(SMLoc IDLoc, unsigned &Opcode,
   SmallVector<unsigned, 8> Match;
   uint64_t ErrorInfoMissingFeature = 0;
   if (UnsizedMemOp && UnsizedMemOp->isMemUnsized()) {
-    static const unsigned MopSizes[] = {8, 16, 32, 64, 80};
+    static const unsigned MopSizes[] = {8, 16, 32, 64, 80, 128, 256, 512};
     for (unsigned Size : MopSizes) {
       UnsizedMemOp->Mem.Size = Size;
       uint64_t ErrorInfoIgnore;
diff --git a/llvm/test/MC/X86/intel-syntax-unsized-memory.s b/llvm/test/MC/X86/intel-syntax-unsized-memory.s
new file mode 100644
index 00000000000..3467f8fb3e8
--- /dev/null
+++ b/llvm/test/MC/X86/intel-syntax-unsized-memory.s
@@ -0,0 +1,26 @@
+// RUN: llvm-mc -triple x86_64-unknown-unknown -x86-asm-syntax=intel -mcpu=knl %s | FileCheck %s
+
+// Check that we deduce unsized memory operands in the general, unambiguous, case.
+// We can't deduce xword memory operands, because there is no instruction
+// unambiguously accessing 80-bit memory.
+
+// CHECK: movb %al, (%rax)
+mov [rax], al
+
+// CHECK: movw %ax, (%rax)
+mov [rax], ax
+
+// CHECK: movl %eax, (%rax)
+mov [rax], eax
+
+// CHECK: movq %rax, (%rax)
+mov [rax], rax
+
+// CHECK: movdqa %xmm0, (%rax)
+movdqa [rax], xmm0
+
+// CHECK: vmovdqa %ymm0, (%rax)
+vmovdqa [rax], ymm0
+
+// CHECK: vaddps (%rax), %zmm1, %zmm1
+vaddps zmm1, zmm1, [rax]