Inlined GC Polls for call to methods with SuppressGCTransitionAttribute

src/coreclr/src/jit/block.h

@@ -446,6 +446,7 @@ struct BasicBlock : private LIR::Range
 #define BBF_DOMINATED_BY_EXCEPTIONAL_ENTRY 0x800000000 // Block is dominated by exceptional entry.
 #define BBF_BACKWARD_JUMP_TARGET          0x1000000000 // Block is a target of a backward jump
 #define BBF_PATCHPOINT                    0x2000000000 // Block is a patchpoint
+#define BBF_HAS_SUPPRESSGC_CALL           0x4000000000 // BB contains a call to a method with SuppressGCTransitionAttribute
 
 // clang-format on
 

src/coreclr/src/jit/compiler.cpp

@@ -4842,6 +4842,9 @@ void Compiler::compCompile(void** methodCodePtr, ULONG* methodCodeSize, JitFlags
     compQuirkForPPPflag = compQuirkForPPP();
 #endif
 
+    // Insert GC Polls
+    DoPhase(this, PHASE_INSERT_GC_POLLS, &Compiler::fgInsertGCPolls);
+
     // Determine start of cold region if we are hot/cold splitting
     //
     DoPhase(this, PHASE_DETERMINE_FIRST_COLD_BLOCK, &Compiler::fgDetermineFirstColdBlock);

src/coreclr/src/jit/compiler.h

@@ -4982,10 +4982,11 @@ class Compiler
     void fgInitBlockVarSets();
 
     // true if we've gone through and created GC Poll calls.
-    bool fgGCPollsCreated;
-    void fgMarkGCPollBlocks();
-    void fgCreateGCPolls();
-    bool fgCreateGCPoll(GCPollType pollType, BasicBlock* block, Statement* stmt = nullptr);
+    bool        fgGCPollsCreated;
+    void        fgMarkGCPollBlocks();
+    void        fgCreateGCPolls();
+    PhaseStatus fgInsertGCPolls();
+    BasicBlock* fgCreateGCPoll(GCPollType pollType, BasicBlock* block);
 
     // Requires that "block" is a block that returns from
     // a finally.  Returns the number of successors (jump targets of
@@ -6509,6 +6510,7 @@ class Compiler
 #define OMF_HAS_GUARDEDDEVIRT 0x00000080    // Method contains guarded devirtualization candidate
 #define OMF_HAS_EXPRUNTIMELOOKUP 0x00000100 // Method contains a runtime lookup to an expandable dictionary.
 #define OMF_HAS_PATCHPOINT 0x00000200       // Method contains patchpoints
+#define OMF_NEEDS_GCPOLLS 0x00000400        // Method needs GC polls
 
     bool doesMethodHaveFatPointer()
     {

src/coreclr/src/jit/compphases.h

@@ -87,6 +87,7 @@ CompPhaseNameMacro(PHASE_ASSERTION_PROP_MAIN,    "Assertion prop",
 #endif
 CompPhaseNameMacro(PHASE_OPT_UPDATE_FLOW_GRAPH,  "Update flow graph opt pass",     "UPD-FG-O", false, -1, false)
 CompPhaseNameMacro(PHASE_COMPUTE_EDGE_WEIGHTS2,  "Compute edge weights (2, false)",       "EDG-WGT2", false, -1, false)
+CompPhaseNameMacro(PHASE_INSERT_GC_POLLS,        "Insert GC Polls",                "GC-POLLS", false, -1, true)
 CompPhaseNameMacro(PHASE_DETERMINE_FIRST_COLD_BLOCK, "Determine first cold block", "COLD-BLK", false, -1, true)
 CompPhaseNameMacro(PHASE_RATIONALIZE,            "Rationalize IR",                 "RAT",      false, -1, false)
 CompPhaseNameMacro(PHASE_SIMPLE_LOWERING,        "Do 'simple' lowering",           "SMP-LWR",  false, -1, false)