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teach X86InstrInfo::copyRegToReg how to copy into ST(0) from

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an RFP register class.

Teach ScheduleDAG how to handle CopyToReg with different src/dst 
reg classes.

This allows us to compile trivial inline asms that expect stuff
on the top of x87-fp stack.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48107 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2008-03-09 09:15:31 +00:00
parent 9143699260
commit f30e1cf9b7
3 changed files with 57 additions and 16 deletions
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16
test/CodeGen/X86/inline-asm-fpstack.ll
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@@ -10,4 +10,20 @@ define double @test2() {
ret double %tmp85
}
define void @test3(x86_fp80 %X) {
call void asm sideeffect "frob ", "{st(0)},~{dirflag},~{fpsr},~{flags}"( x86_fp80 %X)
ret void
}
define void @test4(double %X) {
call void asm sideeffect "frob ", "{st(0)},~{dirflag},~{fpsr},~{flags}"( double %X)
ret void
}
define void @test5(double %X) {
%Y = add double %X, 123.0
call void asm sideeffect "frob ", "{st(0)},~{dirflag},~{fpsr},~{flags}"( double %Y)
ret void
}