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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66359 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-03-08 01:54:43 +00:00
parent 476769498e
commit b34487dcba
1 changed files with 22 additions and 0 deletions
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22
lib/Target/X86/README.txt
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@ -1818,3 +1818,25 @@ LBB1_1: ## bb1
jne LBB1_1 ## bb1
//===---------------------------------------------------------------------===//
test/CodeGen/X86/2009-03-07-FPConstSelect.ll compiles to:
_f:
xorl %eax, %eax
cmpl $0, 4(%esp)
movl $4, %ecx
cmovne %eax, %ecx
flds LCPI1_0(%ecx)
ret
we should recognize cmov of 0 and a power of two and compile it into a
setcc+shift. This would give us something like:
_f:
xorl %eax,%eax
cmpl $0, 4(%esp)
seteq %al
flds LCPI1_0(%ecx, %eax,4)
ret
//===---------------------------------------------------------------------===//