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implement PR8524, apparently mainline gas accepts movq as an alias for movd

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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
This commit is contained in:
Chris Lattner 2010-11-21 08:18:57 +00:00
parent 604f6fe553
commit cbf5d74e6a
2 changed files with 11 additions and 0 deletions
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4
lib/Target/X86/X86InstrInfo.td
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@ -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)>;

7
test/MC/X86/x86-64.s
View File

@ -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]