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6fec4b3a5f
Right now scalarpre doesn't have phi-translate support, so it will miss some
simple pre opportunities. Like the following testcase, current scalarpre cannot
recognize the last "a * b" is fully redundent because a and b used by the last
"a * b" expr are both defined by phis.
long a[100], b[100], g1, g2, g3;
__attribute__((pure)) long goo();
void foo(long a, long b, long c, long d) {
g1 = a * b;
if (__builtin_expect(g2 > 3, 0)) {
a = c;
b = d;
g2 = a * b;
}
g3 = a * b; // fully redundant.
}
The patch adds phi-translate support in scalarpre. This is only a temporary
solution before the newpre based on newgvn is available.
Differential Revision: https://reviews.llvm.org/D32252
llvm-svn: 303923
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|---|---|---|
| .. | ||
| InstCombine | ||
| IPO | ||
| Scalar | ||
| Utils | ||
| Vectorize | ||
| Coroutines.h | ||
| GCOVProfiler.h | ||
| InstrProfiling.h | ||
| Instrumentation.h | ||
| IPO.h | ||
| ObjCARC.h | ||
| PGOInstrumentation.h | ||
| SampleProfile.h | ||
| Scalar.h | ||
| Vectorize.h | ||