[llvm] [NVPTX] Add truncate and zero-extend free type conversions (PR #125580)
Baodi Shan via llvm-commits
llvm-commits at lists.llvm.org
Tue Feb 4 07:13:22 PST 2025
================
@@ -150,6 +150,28 @@ class NVPTXTargetLowering : public TargetLowering {
DstTy->getPrimitiveSizeInBits() == 32;
}
+ bool isTruncateFree(EVT SrcVT, EVT DstVT) const override {
+ // Truncating from i64 to i32 is free
+ if (SrcVT.isInteger() && DstVT.isInteger())
+ return SrcVT.getSizeInBits() == 64 && DstVT.getSizeInBits() == 32;
+ return false;
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lwshanbd wrote:
Why does it need to return false when both are isInteger?
https://github.com/llvm/llvm-project/pull/125580
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