================
@@ -2573,7 +2574,17 @@ bool AMDGPULegalizerInfo::legalizeAddrSpaceCast(
return B.buildIntToPtr(Dst, Sub).getReg(0);
}
- // Extract low 32-bits of the pointer.
+ if (DestAS == AMDGPUAS::BARRIER) {
+ // flat -> barrier: extract the low 32 bits, then sub the barrier AS
+ // offset.
+ Register LoBits = B.buildExtract(S32, Src, 0).getReg(0);
+ Register Sub =
+ B.buildSub(S32, LoBits,
+ B.buildConstant(S32, AMDGPUAS::BarrierAddrLDSOffset))
+ .getReg(0);
+ return B.buildIntToPtr(Dst, Sub).getReg(0);
+ }
----------------
ssahasra wrote:
I am guessing that masking out AMDGPUAS::BarrierAddrLDSOffset is cheaper than
subtracting it.
https://github.com/llvm/llvm-project/pull/209746
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