diff options
Diffstat (limited to 'llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp b/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp index c257cf9e1d0..2bfd11a2574 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineSelect.cpp @@ -1457,6 +1457,16 @@ Instruction *InstCombiner::foldSPFofSPF(Instruction *Inner, } } + // max(max(A, B), min(A, B)) --> max(A, B) + // min(min(A, B), max(A, B)) --> min(A, B) + // TODO: This could be done in instsimplify. + if (SPF1 == SPF2 && + ((SPF1 == SPF_UMIN && match(C, m_c_UMax(m_Specific(A), m_Specific(B)))) || + (SPF1 == SPF_SMIN && match(C, m_c_SMax(m_Specific(A), m_Specific(B)))) || + (SPF1 == SPF_UMAX && match(C, m_c_UMin(m_Specific(A), m_Specific(B)))) || + (SPF1 == SPF_SMAX && match(C, m_c_SMin(m_Specific(A), m_Specific(B)))))) + return replaceInstUsesWith(Outer, Inner); + // ABS(ABS(X)) -> ABS(X) // NABS(NABS(X)) -> NABS(X) // TODO: This could be done in instsimplify. |
