forked from OSchip/llvm-project
25067f179f
This adds support for loops like
unsigned clz(unsigned x) {
unsigned w = sizeof (x) * CHAR_BIT;
while (x) {
w--;
x >>= 1;
}
return w;
}
and
unsigned clz(unsigned x) {
unsigned w = sizeof (x) * CHAR_BIT - 1;
while (x >>= 1) {
w--;
}
return w;
}
To support these we look for add x, -1 as well as add x, 1 that
we already matched. If the value was -1 we need to subtract from
the initial counter value instead of adding to it.
Fixes PR48404.
Differential Revision: https://reviews.llvm.org/D92745
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| .. | ||
| AMDGPU | ||
| ARM | ||
| X86 | ||
| basic-address-space.ll | ||
| basic.ll | ||
| crash.ll | ||
| ctpop-multiple-users-crash.ll | ||
| dbginfo-cost.ll | ||
| debug-line.ll | ||
| disable-options.ll | ||
| expander-do-not-delete-reused-values.ll | ||
| int_sideeffect.ll | ||
| lir-heurs-multi-block-loop.ll | ||
| memcpy-debugify-remarks.ll | ||
| memcpy-vectors.ll | ||
| memset-debugify-remarks.ll | ||
| memset_noidiom.ll | ||
| non-canonical-loop.ll | ||
| non-integral-pointers.ll | ||
| nontemporal_store.ll | ||
| phi-insertion.ll | ||
| pr28196.ll | ||
| pr33114.ll | ||
| reuse-cast.ll | ||
| scev-invalidation.ll | ||
| scev-invalidation_topmostloop.ll | ||
| struct-custom-dl.ll | ||
| struct.ll | ||
| struct_pattern.ll | ||
| unordered-atomic-memcpy-noarch.ll | ||
| unroll-custom-dl.ll | ||
| unroll.ll | ||
| unsafe.ll | ||
| unwind.ll | ||