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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30271 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner
2006-09-12 06:36:01 +00:00
parent f19fb9b4f4
commit adaa38f13d
1 changed files with 14 additions and 0 deletions
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14
lib/Target/X86/README.txt
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@@ -628,3 +628,17 @@ _test:
This saves a movzbl, and saves a truncate if it doesn't get coallesced right. This saves a movzbl, and saves a truncate if it doesn't get coallesced right.
This is a simple DAGCombine to propagate the zext through the and. This is a simple DAGCombine to propagate the zext through the and.
//===---------------------------------------------------------------------===//
Instead of:
cmpl $4294967295, %edx
jg LBB1_8 #cond_false49
emit:
testl %edx, %edx
js LBB1_8
This saves a byte of code space.