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add some other xforms that should be done as part of PR5783

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@91428 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-12-15 09:05:13 +00:00
parent 4a5129c700
commit 099b41f342
1 changed files with 4 additions and 3 deletions
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7
lib/Transforms/Scalar/SimplifyLibCalls.cpp
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@ -2644,10 +2644,11 @@ bool SimplifyLibCalls::doInitialization(Module &M) {
// * strcspn("",a) -> 0
// * strcspn(s,"") -> strlen(a)
//
// strstr:
// strstr: (PR5783)
// * strstr(x,x) -> x
// * strstr(s1,s2) -> offset_of_s2_in(s1)
// (if s1 and s2 are constant strings)
// * strstr(x, "") -> x
// * strstr(x, "a") -> strchr(x, 'a')
// * strstr(s1,s2) -> result (if s1 and s2 are constant strings)
//
// tan, tanf, tanl:
// * tan(atan(x)) -> x