RISCV: Start moving runtime libcall config to tablegen

[arsenm]

This doesn't yet attempt to move the OS dependent configuration
shared with other targets. Removes __riscv_flush_icache from the
default set so it's no longer falsely reported as available for
other targets.

[arsenm]

Warning

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• RuntimeLibcalls: Avoid adding f80 calls to default set #147658
• RuntimeLibcalls: Avoid adding ppcf128 calls to non-ppc targets #147656
• RISCV: Start moving runtime libcall config to tablegen #147652 👈 (View in Graphite)
• RuntimeLibcalls: Stop using defset for default calls #147651
• Hexagon: Move runtime libcall configuration to tablegen #147482
• DAG: Use fast variants of fast math libcalls #147481
• ARM: Start moving runtime libcalls into tablegen #146084
• ARM: Unconditionally set eabi libcall calling convs in RuntimeLibcalls #146083
• RuntimeLibcalls: Remove table of soft float compare cond codes #146082
• MSP430: Move libcall CC setting to RuntimeLibcallsInfo #146081
• Lanai: Use TableGen to set libcall calling conventions #146080
• TableGen: Handle setting runtime libcall calling conventions #144980
• RuntimeLibcalls: Associate calling convention with libcall impls #144979
• TableGen: Allow defining sets of runtime libraries #144978
• AArch64: Add libcall impl declarations for __arm_sc* memory functions #144977
• XCore: Declare libcalls used for align 4 memcpy #144976
• Hexagon: Add libcall declarations for special memcpy #144975
• ARM: Add runtime libcall definitions for aebi memory functions #144974
• TableGen: Generate enum for runtime libcall implementations #144973
• TableGen: Add runtime libcall backend #144972
• PowerPC: Stop reporting memcpy as an alias of memmove on AIX #143836
• main

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[llvmbot]

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@llvm/pr-subscribers-llvm-ir

Author: Matt Arsenault (arsenm)

Changes

This doesn't yet attempt to move the OS dependent configuration
shared with other targets. Removes __riscv_flush_icache from the
default set so it's no longer falsely reported as available for
other targets.

---

Full diff: https://github.com/llvm/llvm-project/pull/147652.diff

1 Files Affected:

• (modified) llvm/include/llvm/IR/RuntimeLibcalls.td (+14-1)

diff --git a/llvm/include/llvm/IR/RuntimeLibcalls.td b/llvm/include/llvm/IR/RuntimeLibcalls.td
index ee4892ee186cd..fabfaf89b5aa0 100644
--- a/llvm/include/llvm/IR/RuntimeLibcalls.td
+++ b/llvm/include/llvm/IR/RuntimeLibcalls.td
@@ -668,7 +668,6 @@ def __llvm_deoptimize : RuntimeLibcallImpl<DEOPTIMIZE>;
 
 // Clear cache
 def __clear_cache : RuntimeLibcallImpl<CLEAR_CACHE>;
-def __riscv_flush_icache : RuntimeLibcallImpl<RISCV_FLUSH_ICACHE>;
 
 //--------------------------------------------------------------------
 // libm
@@ -928,6 +927,8 @@ def bzero : RuntimeLibcallImpl<BZERO>;
 def __bzero : RuntimeLibcallImpl<BZERO>;
 def _Unwind_SjLj_Resume : RuntimeLibcallImpl<UNWIND_RESUME>;
 
+def __riscv_flush_icache : RuntimeLibcallImpl<RISCV_FLUSH_ICACHE>;
+
 //===----------------------------------------------------------------------===//
 // F128 libm Runtime Libcalls
 //===----------------------------------------------------------------------===//
@@ -1846,6 +1847,18 @@ def PPCSystemLibrary
            AvailableIf<memcpy, isNotAIX>,
            LibcallImpls<(add Int128RTLibcalls), isPPC64>)>;
 
+//===----------------------------------------------------------------------===//
+// RISCV Runtime Libcalls
+//===----------------------------------------------------------------------===//
+
+def isRISCV : RuntimeLibcallPredicate<"TT.isRISCV()">;
+def isRISCV64 : RuntimeLibcallPredicate<"TT.isRISCV64()">;
+
+def RISCVSystemLibrary
+    : SystemRuntimeLibrary<isRISCV,
+      (add DefaultRuntimeLibcallImpls, __riscv_flush_icache,
+           LibcallImpls<(add Int128RTLibcalls), isRISCV64>)>;
+
 //===----------------------------------------------------------------------===//
 // SPARC Runtime Libcalls
 //===----------------------------------------------------------------------===//