[llvm] [RISCV] Loosen the requirement of shadow stack codegen to Zimop (PR #152251)

[Craig Topper via llvm-commits]

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@@ -62,6 +62,21 @@ defm SSAMOSWAP_W  : AMO_rr_aq_rl<0b01001, 0b010, "ssamoswap.w">;
 let Predicates = [HasStdExtZicfiss, IsRV64] in
 defm SSAMOSWAP_D  : AMO_rr_aq_rl<0b01001, 0b011, "ssamoswap.d">;
 
+let Predicates = [HasStdExtZimop] in {
+let hasSideEffects = 0, mayLoad = 0, mayStore = 1 in
+def PseudoMOP_SSPUSH : Pseudo<(outs), (ins GPRX1X5:$rs2), []>,
+    PseudoInstExpansion<(MOPRR7 X0, X0, GPR:$rs2)>;
+let hasSideEffects = 0, mayLoad = 1, mayStore = 0 in
+def PseudoMOP_SSPOPCHK : Pseudo<(outs), (ins GPRX1X5:$rs1), []>,
+    PseudoInstExpansion<(MOPR28 X0, GPR:$rs1)>;
+} // Predicates = [HasStdExtZimop]
+
+let Predicates = [HasStdExtZcmop] in {
+let Uses = [X1], hasSideEffects = 0, mayLoad = 0, mayStore = 1 in
+def PseudoMOP_C_SSPUSH : Pseudo<(outs), (ins), []>,
+    PseudoInstExpansion<(C_MOP1)>;
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topperc wrote:

You'll need to rebase and rename this to C_MOP_1

https://github.com/llvm/llvm-project/pull/152251