[clang] [llvm] cuda clang: Fix argument order for __reduce_max_sync (PR #132881)

[Austin Schuh via llvm-commits]

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@@ -315,7 +315,7 @@ defm MATCH_ALLP_SYNC_64 : MATCH_ALLP_SYNC<Int64Regs, "b64", int_nvvm_match_all_s
 multiclass REDUX_SYNC<string BinOp, string PTXType, Intrinsic Intrin> {
   def : NVPTXInst<(outs Int32Regs:$dst), (ins Int32Regs:$src, Int32Regs:$mask),
           "redux.sync." # BinOp # "." # PTXType # " $dst, $src, $mask;",
-          [(set i32:$dst, (Intrin i32:$src, Int32Regs:$mask))]>,
+          [(set i32:$dst, (Intrin i32:$mask, Int32Regs:$src))]>,
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AustinSchuh wrote:

I swear I read the code multiple times, and couldn't see the swap.  I agree with you now, that's the right place to swap it.  The argument order matches the docs in the other spots, but not in __clang_cuda_intrinsics.h.  That also keeps the tests working (and explains why the tests didn't catch it).

https://github.com/llvm/llvm-project/pull/132881