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Add a few missed xforms from GCC PR14753

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125681 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2011-02-16 19:16:34 +00:00
parent a901129169
commit 5653f1f904
1 changed files with 29 additions and 0 deletions
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29
lib/Target/README.txt
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@ -2218,3 +2218,32 @@ llc time when it gets inlined, because we can use smaller transfers. This also
avoids partial register stalls in some important cases.
//===---------------------------------------------------------------------===//
Some missed instcombine xforms (from GCC PR14753):
void bar (void);
void mask_gt (unsigned int a) {
/* This is equivalent to a > 15. */
if ((a & ~7) > 8)
bar();
}
void neg_eq_cst(unsigned int a) {
if (-a == 123)
bar();
}
void minus_cst(unsigned int a) {
if (20 - a == 5)
bar();
}
void rotate_cst (unsigned a) {
a = (a << 10) | (a >> 22);
if (a == 123)
bar ();
}
//===---------------------------------------------------------------------===//