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This is important for several reasons: 1. Benchmarks have lots of code that looks like this (perlbmk in particular): %tmp.2.i = setne int %tmp.0.i, 128 ; <bool> [#uses=1] %tmp.6343 = seteq int %tmp.0.i, 1 ; <bool> [#uses=1] %tmp.63 = and bool %tmp.2.i, %tmp.6343 ; <bool> [#uses=1] we now fold away the setne, a clear improvement. 2. In the more important cases, such as (X >= 10) & (X < 20), we now produce smaller code: (X-10) < 10. 3. Perhaps the nicest effect of this patch is that it really helps out the code generators. In particular, for a 'range test' like the above, instead of generating this on X86 (the difference on PPC is even more pronounced): cmp %EAX, 50 setge %CL cmp %EAX, 100 setl %AL and %CL, %AL cmp %CL, 0 we now generate this: add %EAX, -50 cmp %EAX, 50 Furthermore, this causes setcc's to be folded into branches more often. These combinations trigger dozens of times in the spec benchmarks, particularly in 176.gcc, 186.crafty, 253.perlbmk, 254.gap, & 099.go. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16559 91177308-0d34-0410-b5e6-96231b3b80d8 |
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.. | ||
Hello | ||
Instrumentation | ||
IPO | ||
Scalar | ||
Utils | ||
ExprTypeConvert.cpp | ||
LevelRaise.cpp | ||
Makefile | ||
TransformInternals.cpp | ||
TransformInternals.h |