6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-09-24 23:28:41 +00:00
Code Issues Projects Releases Wiki Activity

Added instcombine for 'MIN(MIN(A, 27), 93)' and 'MAX(MAX(A, 93), 27)'

Browse Source 
MIN(MIN(A, 23), 97) -> MIN(A, 23)
MAX(MAX(A, 97), 23) -> MAX(A, 97)

Differential Revision: http://reviews.llvm.org/D3629



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208849 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dinesh Dwivedi
2014-05-15 06:13:40 +00:00
parent d10a54f07f
commit 707048b0db
2 changed files with 66 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
lib/Transforms/InstCombine/InstCombineSelect.cpp
View File

@@ -683,11 +683,27 @@ Instruction *InstCombiner::FoldSPFofSPF(Instruction *Inner,
return ReplaceInstUsesWith(Outer, C);
}
// TODO: MIN(MIN(A, 23), 97)
// MIN(MIN(A, 23), 97) -> MIN(A, 23)
// MAX(MAX(A, 97), 23) -> MAX(A, 97)
if (SPF1 == SPF2) {
if (ConstantInt *CB = dyn_cast<ConstantInt>(B)) {
if (ConstantInt *CC = dyn_cast<ConstantInt>(C)) {
APInt ACB = CB->getValue();
APInt ACC = CC->getValue();
if ((SPF1 == SPF_UMIN && ACB.ule(ACC)) ||
(SPF1 == SPF_SMIN && ACB.sle(ACC)) ||
(SPF1 == SPF_UMAX && ACB.uge(ACC)) ||
(SPF1 == SPF_SMAX && ACB.sge(ACC)))
return ReplaceInstUsesWith(Outer, Inner);
}
}
}
// TODO: MIN(MIN(A, 97), 23) -> MIN(A, 23)
// TODO: MAX(MAX(A, 23), 97) -> MAX(A, 97)
return nullptr;
}
/// foldSelectICmpAnd - If one of the constants is zero (we know they can't
/// both be) and we have an icmp instruction with zero, and we have an 'and'
/// with the non-constant value and a power of two we can turn the select