[llvm] [RegAlloc][X86] Rematerialization of instructions with physical register (PR #198853)

[via llvm-commits]

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@@ -30,6 +30,12 @@ using namespace llvm;
 
 #define DEBUG_TYPE "calcspillweights"
 
+cl::opt<bool> AllowRematerializePhysReg(
+    "allow-rematerialize-phys-reg",
+    cl::desc("Allow rematerialize instructions with physical register "
+             "definition, like POPCNT on x86 can write EFLAGS register."),
+    cl::init(false), cl::Hidden);
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weiguozhi wrote:

I will remove this command line option and the new hook.

But I think when we want to enable this kind of rematerialization on AArch64 or PowerPC, we still need something similar.


https://github.com/llvm/llvm-project/pull/198853