From: Chris Lattner <sabre@nondot.org>
Date: Sun, 21 Nov 2010 08:18:57 +0000 (+0000)
Subject: implement PR8524, apparently mainline gas accepts movq as an alias for movd
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=cbf5d74e6a99b6e38c9c05e08b6319ed0ce49650;p=oota-llvm.git

implement PR8524, apparently mainline gas accepts movq as an alias for movd
when transfering between i64 gprs and mmx regs.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119931 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/X86/X86InstrInfo.td b/lib/Target/X86/X86InstrInfo.td
index 0a60eb7b917..10e9e9a88e4 100644
--- a/lib/Target/X86/X86InstrInfo.td
+++ b/lib/Target/X86/X86InstrInfo.td
@@ -1497,6 +1497,10 @@ def : InstAlias<"mov $seg, $mem", (MOV32ms i32mem:$mem, SEGMENT_REG:$seg)>;
 // Match 'movq <largeimm>, <reg>' as an alias for movabsq.
 def : InstAlias<"movq $imm, $reg", (MOV64ri GR64:$reg, i64imm:$imm)>;
 
+// Match 'movq GR64, MMX' as an alias for movd.
+def : InstAlias<"movq $src, $dst", (MMX_MOVD64to64rr VR64:$dst, GR64:$src)>;
+def : InstAlias<"movq $src, $dst", (MMX_MOVD64from64rr GR64:$dst, VR64:$src)>;
+
 // movsd with no operands (as opposed to the SSE scalar move of a double) is an
 // alias for movsl. (as in rep; movsd)
 def : InstAlias<"movsd", (MOVSD)>;
diff --git a/test/MC/X86/x86-64.s b/test/MC/X86/x86-64.s
index b8b093c19b8..f1a14e871f1 100644
--- a/test/MC/X86/x86-64.s
+++ b/test/MC/X86/x86-64.s
@@ -902,3 +902,10 @@ mov %gs, (%rsi)  // CHECK: movl	%gs, (%rsi) # encoding: [0x8c,0x2e]
 	idiv	0x7eed,%eax
 	idiv	0xbabecafe,%eax
 	idiv	0x12345678,%eax
+
+// PR8524
+movd	%rax, %mm5 // CHECK: movd %rax, %mm5 # encoding: [0x48,0x0f,0x6e,0xe8]
+movd	%mm5, %rbx // CHECK: movd %mm5, %rbx # encoding: [0x48,0x0f,0x7e,0xeb]
+movq	%rax, %mm5 // CHECK: movd %rax, %mm5 # encoding: [0x48,0x0f,0x6e,0xe8]
+movq	%mm5, %rbx // CHECK: movd %mm5, %rbx # encoding: [0x48,0x0f,0x7e,0xeb]
+