[llvm-branch-commits] [llvm] release/21.x: [RISCV] Support PreserveMost calling convention (#148214) (PR #158402)
via llvm-branch-commits
llvm-branch-commits at lists.llvm.org
Fri Sep 12 20:17:37 PDT 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-llvm-ir
Author: None (llvmbot)
<details>
<summary>Changes</summary>
Backport 058d96f2d68d3496ae52774c06177d4a9039a134
Requested by: @<!-- -->wzssyqa
---
Patch is 20.40 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/158402.diff
5 Files Affected:
- (modified) llvm/docs/LangRef.rst (+2)
- (modified) llvm/lib/Target/RISCV/RISCVCallingConv.td (+4)
- (modified) llvm/lib/Target/RISCV/RISCVISelLowering.cpp (+1)
- (modified) llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp (+10-1)
- (added) llvm/test/CodeGen/RISCV/calling-conv-preserve-most.ll (+449)
``````````diff
diff --git a/llvm/docs/LangRef.rst b/llvm/docs/LangRef.rst
index 8ea850af7a69b..2a9b67b671e11 100644
--- a/llvm/docs/LangRef.rst
+++ b/llvm/docs/LangRef.rst
@@ -413,6 +413,8 @@ added in the future:
- On AArch64 the callee preserve all general purpose registers, except
X0-X8 and X16-X18. Not allowed with ``nest``.
+ - On RISC-V the callee preserve x5-x31 except x6, x7 and x28 registers.
+
The idea behind this convention is to support calls to runtime functions
that have a hot path and a cold path. The hot path is usually a small piece
of code that doesn't use many registers. The cold path might need to call out to
diff --git a/llvm/lib/Target/RISCV/RISCVCallingConv.td b/llvm/lib/Target/RISCV/RISCVCallingConv.td
index cbf039edec273..d8c52cbde04c7 100644
--- a/llvm/lib/Target/RISCV/RISCVCallingConv.td
+++ b/llvm/lib/Target/RISCV/RISCVCallingConv.td
@@ -93,3 +93,7 @@ def CSR_XLEN_F32_V_Interrupt_RVE: CalleeSavedRegs<(sub CSR_XLEN_F32_V_Interrupt,
// Same as CSR_XLEN_F64_V_Interrupt, but excluding X16-X31.
def CSR_XLEN_F64_V_Interrupt_RVE: CalleeSavedRegs<(sub CSR_XLEN_F64_V_Interrupt,
(sequence "X%u", 16, 31))>;
+
+def CSR_RT_MostRegs : CalleeSavedRegs<(sub CSR_Interrupt, X6, X7, X28)>;
+def CSR_RT_MostRegs_RVE : CalleeSavedRegs<(sub CSR_RT_MostRegs,
+ (sequence "X%u", 16, 31))>;
diff --git a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
index 5fb16f5ac6b9e..07a03792c2b23 100644
--- a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
+++ b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
@@ -22224,6 +22224,7 @@ SDValue RISCVTargetLowering::LowerFormalArguments(
case CallingConv::C:
case CallingConv::Fast:
case CallingConv::SPIR_KERNEL:
+ case CallingConv::PreserveMost:
case CallingConv::GRAAL:
case CallingConv::RISCV_VectorCall:
#define CC_VLS_CASE(ABI_VLEN) case CallingConv::RISCV_VLSCall_##ABI_VLEN:
diff --git a/llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp b/llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp
index 540412366026b..214536d7f3a74 100644
--- a/llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp
+++ b/llvm/lib/Target/RISCV/RISCVRegisterInfo.cpp
@@ -68,6 +68,9 @@ RISCVRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
auto &Subtarget = MF->getSubtarget<RISCVSubtarget>();
if (MF->getFunction().getCallingConv() == CallingConv::GHC)
return CSR_NoRegs_SaveList;
+ if (MF->getFunction().getCallingConv() == CallingConv::PreserveMost)
+ return Subtarget.hasStdExtE() ? CSR_RT_MostRegs_RVE_SaveList
+ : CSR_RT_MostRegs_SaveList;
if (MF->getFunction().hasFnAttribute("interrupt")) {
if (Subtarget.hasVInstructions()) {
if (Subtarget.hasStdExtD())
@@ -811,7 +814,13 @@ RISCVRegisterInfo::getCallPreservedMask(const MachineFunction & MF,
if (CC == CallingConv::GHC)
return CSR_NoRegs_RegMask;
- switch (Subtarget.getTargetABI()) {
+ RISCVABI::ABI ABI = Subtarget.getTargetABI();
+ if (CC == CallingConv::PreserveMost) {
+ if (ABI == RISCVABI::ABI_ILP32E || ABI == RISCVABI::ABI_LP64E)
+ return CSR_RT_MostRegs_RVE_RegMask;
+ return CSR_RT_MostRegs_RegMask;
+ }
+ switch (ABI) {
default:
llvm_unreachable("Unrecognized ABI");
case RISCVABI::ABI_ILP32E:
diff --git a/llvm/test/CodeGen/RISCV/calling-conv-preserve-most.ll b/llvm/test/CodeGen/RISCV/calling-conv-preserve-most.ll
new file mode 100644
index 0000000000000..08340bbe0013a
--- /dev/null
+++ b/llvm/test/CodeGen/RISCV/calling-conv-preserve-most.ll
@@ -0,0 +1,449 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=riscv32 < %s | FileCheck %s -check-prefix=RV32I
+; RUN: llc -mtriple=riscv64 < %s | FileCheck %s -check-prefix=RV64I
+; RUN: llc -mtriple=riscv32 -mattr=+e -target-abi ilp32e < %s | FileCheck %s -check-prefix=RV32E
+; RUN: llc -mtriple=riscv64 -mattr=+e -target-abi lp64e < %s | FileCheck %s -check-prefix=RV64E
+
+; Check the PreserveMost calling convention works.
+
+declare void @standard_cc_func()
+declare preserve_mostcc void @preserve_mostcc_func()
+
+define preserve_mostcc void @preserve_mostcc1() nounwind {
+; RV32I-LABEL: preserve_mostcc1:
+; RV32I: # %bb.0: # %entry
+; RV32I-NEXT: addi sp, sp, -64
+; RV32I-NEXT: sw ra, 60(sp) # 4-byte Folded Spill
+; RV32I-NEXT: sw t0, 56(sp) # 4-byte Folded Spill
+; RV32I-NEXT: sw a0, 52(sp) # 4-byte Folded Spill
+; RV32I-NEXT: sw a1, 48(sp) # 4-byte Folded Spill
+; RV32I-NEXT: sw a2, 44(sp) # 4-byte Folded Spill
+; RV32I-NEXT: sw a3, 40(sp) # 4-byte Folded Spill
+; RV32I-NEXT: sw a4, 36(sp) # 4-byte Folded Spill
+; RV32I-NEXT: sw a5, 32(sp) # 4-byte Folded Spill
+; RV32I-NEXT: sw a6, 28(sp) # 4-byte Folded Spill
+; RV32I-NEXT: sw a7, 24(sp) # 4-byte Folded Spill
+; RV32I-NEXT: sw t4, 20(sp) # 4-byte Folded Spill
+; RV32I-NEXT: sw t5, 16(sp) # 4-byte Folded Spill
+; RV32I-NEXT: sw t6, 12(sp) # 4-byte Folded Spill
+; RV32I-NEXT: call standard_cc_func
+; RV32I-NEXT: lw ra, 60(sp) # 4-byte Folded Reload
+; RV32I-NEXT: lw t0, 56(sp) # 4-byte Folded Reload
+; RV32I-NEXT: lw a0, 52(sp) # 4-byte Folded Reload
+; RV32I-NEXT: lw a1, 48(sp) # 4-byte Folded Reload
+; RV32I-NEXT: lw a2, 44(sp) # 4-byte Folded Reload
+; RV32I-NEXT: lw a3, 40(sp) # 4-byte Folded Reload
+; RV32I-NEXT: lw a4, 36(sp) # 4-byte Folded Reload
+; RV32I-NEXT: lw a5, 32(sp) # 4-byte Folded Reload
+; RV32I-NEXT: lw a6, 28(sp) # 4-byte Folded Reload
+; RV32I-NEXT: lw a7, 24(sp) # 4-byte Folded Reload
+; RV32I-NEXT: lw t4, 20(sp) # 4-byte Folded Reload
+; RV32I-NEXT: lw t5, 16(sp) # 4-byte Folded Reload
+; RV32I-NEXT: lw t6, 12(sp) # 4-byte Folded Reload
+; RV32I-NEXT: addi sp, sp, 64
+; RV32I-NEXT: ret
+;
+; RV64I-LABEL: preserve_mostcc1:
+; RV64I: # %bb.0: # %entry
+; RV64I-NEXT: addi sp, sp, -112
+; RV64I-NEXT: sd ra, 104(sp) # 8-byte Folded Spill
+; RV64I-NEXT: sd t0, 96(sp) # 8-byte Folded Spill
+; RV64I-NEXT: sd a0, 88(sp) # 8-byte Folded Spill
+; RV64I-NEXT: sd a1, 80(sp) # 8-byte Folded Spill
+; RV64I-NEXT: sd a2, 72(sp) # 8-byte Folded Spill
+; RV64I-NEXT: sd a3, 64(sp) # 8-byte Folded Spill
+; RV64I-NEXT: sd a4, 56(sp) # 8-byte Folded Spill
+; RV64I-NEXT: sd a5, 48(sp) # 8-byte Folded Spill
+; RV64I-NEXT: sd a6, 40(sp) # 8-byte Folded Spill
+; RV64I-NEXT: sd a7, 32(sp) # 8-byte Folded Spill
+; RV64I-NEXT: sd t4, 24(sp) # 8-byte Folded Spill
+; RV64I-NEXT: sd t5, 16(sp) # 8-byte Folded Spill
+; RV64I-NEXT: sd t6, 8(sp) # 8-byte Folded Spill
+; RV64I-NEXT: call standard_cc_func
+; RV64I-NEXT: ld ra, 104(sp) # 8-byte Folded Reload
+; RV64I-NEXT: ld t0, 96(sp) # 8-byte Folded Reload
+; RV64I-NEXT: ld a0, 88(sp) # 8-byte Folded Reload
+; RV64I-NEXT: ld a1, 80(sp) # 8-byte Folded Reload
+; RV64I-NEXT: ld a2, 72(sp) # 8-byte Folded Reload
+; RV64I-NEXT: ld a3, 64(sp) # 8-byte Folded Reload
+; RV64I-NEXT: ld a4, 56(sp) # 8-byte Folded Reload
+; RV64I-NEXT: ld a5, 48(sp) # 8-byte Folded Reload
+; RV64I-NEXT: ld a6, 40(sp) # 8-byte Folded Reload
+; RV64I-NEXT: ld a7, 32(sp) # 8-byte Folded Reload
+; RV64I-NEXT: ld t4, 24(sp) # 8-byte Folded Reload
+; RV64I-NEXT: ld t5, 16(sp) # 8-byte Folded Reload
+; RV64I-NEXT: ld t6, 8(sp) # 8-byte Folded Reload
+; RV64I-NEXT: addi sp, sp, 112
+; RV64I-NEXT: ret
+;
+; RV32E-LABEL: preserve_mostcc1:
+; RV32E: # %bb.0: # %entry
+; RV32E-NEXT: addi sp, sp, -32
+; RV32E-NEXT: sw ra, 28(sp) # 4-byte Folded Spill
+; RV32E-NEXT: sw t0, 24(sp) # 4-byte Folded Spill
+; RV32E-NEXT: sw a0, 20(sp) # 4-byte Folded Spill
+; RV32E-NEXT: sw a1, 16(sp) # 4-byte Folded Spill
+; RV32E-NEXT: sw a2, 12(sp) # 4-byte Folded Spill
+; RV32E-NEXT: sw a3, 8(sp) # 4-byte Folded Spill
+; RV32E-NEXT: sw a4, 4(sp) # 4-byte Folded Spill
+; RV32E-NEXT: sw a5, 0(sp) # 4-byte Folded Spill
+; RV32E-NEXT: call standard_cc_func
+; RV32E-NEXT: lw ra, 28(sp) # 4-byte Folded Reload
+; RV32E-NEXT: lw t0, 24(sp) # 4-byte Folded Reload
+; RV32E-NEXT: lw a0, 20(sp) # 4-byte Folded Reload
+; RV32E-NEXT: lw a1, 16(sp) # 4-byte Folded Reload
+; RV32E-NEXT: lw a2, 12(sp) # 4-byte Folded Reload
+; RV32E-NEXT: lw a3, 8(sp) # 4-byte Folded Reload
+; RV32E-NEXT: lw a4, 4(sp) # 4-byte Folded Reload
+; RV32E-NEXT: lw a5, 0(sp) # 4-byte Folded Reload
+; RV32E-NEXT: addi sp, sp, 32
+; RV32E-NEXT: ret
+;
+; RV64E-LABEL: preserve_mostcc1:
+; RV64E: # %bb.0: # %entry
+; RV64E-NEXT: addi sp, sp, -64
+; RV64E-NEXT: sd ra, 56(sp) # 8-byte Folded Spill
+; RV64E-NEXT: sd t0, 48(sp) # 8-byte Folded Spill
+; RV64E-NEXT: sd a0, 40(sp) # 8-byte Folded Spill
+; RV64E-NEXT: sd a1, 32(sp) # 8-byte Folded Spill
+; RV64E-NEXT: sd a2, 24(sp) # 8-byte Folded Spill
+; RV64E-NEXT: sd a3, 16(sp) # 8-byte Folded Spill
+; RV64E-NEXT: sd a4, 8(sp) # 8-byte Folded Spill
+; RV64E-NEXT: sd a5, 0(sp) # 8-byte Folded Spill
+; RV64E-NEXT: call standard_cc_func
+; RV64E-NEXT: ld ra, 56(sp) # 8-byte Folded Reload
+; RV64E-NEXT: ld t0, 48(sp) # 8-byte Folded Reload
+; RV64E-NEXT: ld a0, 40(sp) # 8-byte Folded Reload
+; RV64E-NEXT: ld a1, 32(sp) # 8-byte Folded Reload
+; RV64E-NEXT: ld a2, 24(sp) # 8-byte Folded Reload
+; RV64E-NEXT: ld a3, 16(sp) # 8-byte Folded Reload
+; RV64E-NEXT: ld a4, 8(sp) # 8-byte Folded Reload
+; RV64E-NEXT: ld a5, 0(sp) # 8-byte Folded Reload
+; RV64E-NEXT: addi sp, sp, 64
+; RV64E-NEXT: ret
+entry:
+ call void @standard_cc_func()
+ ret void
+}
+
+define preserve_mostcc void @preserve_mostcc2() nounwind {
+; RV32I-LABEL: preserve_mostcc2:
+; RV32I: # %bb.0:
+; RV32I-NEXT: addi sp, sp, -16
+; RV32I-NEXT: sw ra, 12(sp) # 4-byte Folded Spill
+; RV32I-NEXT: call preserve_mostcc_func
+; RV32I-NEXT: lw ra, 12(sp) # 4-byte Folded Reload
+; RV32I-NEXT: addi sp, sp, 16
+; RV32I-NEXT: ret
+;
+; RV64I-LABEL: preserve_mostcc2:
+; RV64I: # %bb.0:
+; RV64I-NEXT: addi sp, sp, -16
+; RV64I-NEXT: sd ra, 8(sp) # 8-byte Folded Spill
+; RV64I-NEXT: call preserve_mostcc_func
+; RV64I-NEXT: ld ra, 8(sp) # 8-byte Folded Reload
+; RV64I-NEXT: addi sp, sp, 16
+; RV64I-NEXT: ret
+;
+; RV32E-LABEL: preserve_mostcc2:
+; RV32E: # %bb.0:
+; RV32E-NEXT: addi sp, sp, -4
+; RV32E-NEXT: sw ra, 0(sp) # 4-byte Folded Spill
+; RV32E-NEXT: call preserve_mostcc_func
+; RV32E-NEXT: lw ra, 0(sp) # 4-byte Folded Reload
+; RV32E-NEXT: addi sp, sp, 4
+; RV32E-NEXT: ret
+;
+; RV64E-LABEL: preserve_mostcc2:
+; RV64E: # %bb.0:
+; RV64E-NEXT: addi sp, sp, -8
+; RV64E-NEXT: sd ra, 0(sp) # 8-byte Folded Spill
+; RV64E-NEXT: call preserve_mostcc_func
+; RV64E-NEXT: ld ra, 0(sp) # 8-byte Folded Reload
+; RV64E-NEXT: addi sp, sp, 8
+; RV64E-NEXT: ret
+ call preserve_mostcc void @preserve_mostcc_func()
+ ret void
+}
+
+; X6, X7 and X28 will be saved to registers.
+define void @preserve_mostcc3() nounwind {
+; RV32I-LABEL: preserve_mostcc3:
+; RV32I: # %bb.0:
+; RV32I-NEXT: addi sp, sp, -16
+; RV32I-NEXT: sw ra, 12(sp) # 4-byte Folded Spill
+; RV32I-NEXT: sw s0, 8(sp) # 4-byte Folded Spill
+; RV32I-NEXT: sw s1, 4(sp) # 4-byte Folded Spill
+; RV32I-NEXT: #APP
+; RV32I-NEXT: #NO_APP
+; RV32I-NEXT: mv a0, t1
+; RV32I-NEXT: #APP
+; RV32I-NEXT: #NO_APP
+; RV32I-NEXT: mv a1, t2
+; RV32I-NEXT: #APP
+; RV32I-NEXT: #NO_APP
+; RV32I-NEXT: #APP
+; RV32I-NEXT: #NO_APP
+; RV32I-NEXT: #APP
+; RV32I-NEXT: #NO_APP
+; RV32I-NEXT: mv a2, t3
+; RV32I-NEXT: call preserve_mostcc_func
+; RV32I-NEXT: mv t1, a0
+; RV32I-NEXT: mv t2, a1
+; RV32I-NEXT: mv t3, a2
+; RV32I-NEXT: #APP
+; RV32I-NEXT: #NO_APP
+; RV32I-NEXT: lw ra, 12(sp) # 4-byte Folded Reload
+; RV32I-NEXT: lw s0, 8(sp) # 4-byte Folded Reload
+; RV32I-NEXT: lw s1, 4(sp) # 4-byte Folded Reload
+; RV32I-NEXT: addi sp, sp, 16
+; RV32I-NEXT: ret
+;
+; RV64I-LABEL: preserve_mostcc3:
+; RV64I: # %bb.0:
+; RV64I-NEXT: addi sp, sp, -32
+; RV64I-NEXT: sd ra, 24(sp) # 8-byte Folded Spill
+; RV64I-NEXT: sd s0, 16(sp) # 8-byte Folded Spill
+; RV64I-NEXT: sd s1, 8(sp) # 8-byte Folded Spill
+; RV64I-NEXT: #APP
+; RV64I-NEXT: #NO_APP
+; RV64I-NEXT: mv a0, t1
+; RV64I-NEXT: #APP
+; RV64I-NEXT: #NO_APP
+; RV64I-NEXT: mv a1, t2
+; RV64I-NEXT: #APP
+; RV64I-NEXT: #NO_APP
+; RV64I-NEXT: #APP
+; RV64I-NEXT: #NO_APP
+; RV64I-NEXT: #APP
+; RV64I-NEXT: #NO_APP
+; RV64I-NEXT: mv a2, t3
+; RV64I-NEXT: call preserve_mostcc_func
+; RV64I-NEXT: mv t1, a0
+; RV64I-NEXT: mv t2, a1
+; RV64I-NEXT: mv t3, a2
+; RV64I-NEXT: #APP
+; RV64I-NEXT: #NO_APP
+; RV64I-NEXT: ld ra, 24(sp) # 8-byte Folded Reload
+; RV64I-NEXT: ld s0, 16(sp) # 8-byte Folded Reload
+; RV64I-NEXT: ld s1, 8(sp) # 8-byte Folded Reload
+; RV64I-NEXT: addi sp, sp, 32
+; RV64I-NEXT: ret
+;
+; RV32E-LABEL: preserve_mostcc3:
+; RV32E: # %bb.0:
+; RV32E-NEXT: addi sp, sp, -12
+; RV32E-NEXT: sw ra, 8(sp) # 4-byte Folded Spill
+; RV32E-NEXT: sw s0, 4(sp) # 4-byte Folded Spill
+; RV32E-NEXT: sw s1, 0(sp) # 4-byte Folded Spill
+; RV32E-NEXT: #APP
+; RV32E-NEXT: #NO_APP
+; RV32E-NEXT: mv a0, t1
+; RV32E-NEXT: #APP
+; RV32E-NEXT: #NO_APP
+; RV32E-NEXT: mv a1, t2
+; RV32E-NEXT: #APP
+; RV32E-NEXT: #NO_APP
+; RV32E-NEXT: #APP
+; RV32E-NEXT: #NO_APP
+; RV32E-NEXT: #APP
+; RV32E-NEXT: #NO_APP
+; RV32E-NEXT: mv a2, t3
+; RV32E-NEXT: call preserve_mostcc_func
+; RV32E-NEXT: mv t1, a0
+; RV32E-NEXT: mv t2, a1
+; RV32E-NEXT: mv t3, a2
+; RV32E-NEXT: #APP
+; RV32E-NEXT: #NO_APP
+; RV32E-NEXT: lw ra, 8(sp) # 4-byte Folded Reload
+; RV32E-NEXT: lw s0, 4(sp) # 4-byte Folded Reload
+; RV32E-NEXT: lw s1, 0(sp) # 4-byte Folded Reload
+; RV32E-NEXT: addi sp, sp, 12
+; RV32E-NEXT: ret
+;
+; RV64E-LABEL: preserve_mostcc3:
+; RV64E: # %bb.0:
+; RV64E-NEXT: addi sp, sp, -24
+; RV64E-NEXT: sd ra, 16(sp) # 8-byte Folded Spill
+; RV64E-NEXT: sd s0, 8(sp) # 8-byte Folded Spill
+; RV64E-NEXT: sd s1, 0(sp) # 8-byte Folded Spill
+; RV64E-NEXT: #APP
+; RV64E-NEXT: #NO_APP
+; RV64E-NEXT: mv a0, t1
+; RV64E-NEXT: #APP
+; RV64E-NEXT: #NO_APP
+; RV64E-NEXT: mv a1, t2
+; RV64E-NEXT: #APP
+; RV64E-NEXT: #NO_APP
+; RV64E-NEXT: #APP
+; RV64E-NEXT: #NO_APP
+; RV64E-NEXT: #APP
+; RV64E-NEXT: #NO_APP
+; RV64E-NEXT: mv a2, t3
+; RV64E-NEXT: call preserve_mostcc_func
+; RV64E-NEXT: mv t1, a0
+; RV64E-NEXT: mv t2, a1
+; RV64E-NEXT: mv t3, a2
+; RV64E-NEXT: #APP
+; RV64E-NEXT: #NO_APP
+; RV64E-NEXT: ld ra, 16(sp) # 8-byte Folded Reload
+; RV64E-NEXT: ld s0, 8(sp) # 8-byte Folded Reload
+; RV64E-NEXT: ld s1, 0(sp) # 8-byte Folded Reload
+; RV64E-NEXT: addi sp, sp, 24
+; RV64E-NEXT: ret
+ %1 = call i32 asm sideeffect "", "={x6}"() nounwind
+ %2 = call i32 asm sideeffect "", "={x7}"() nounwind
+ %3 = call i32 asm sideeffect "", "={x8}"() nounwind
+ %4 = call i32 asm sideeffect "", "={x9}"() nounwind
+ %5 = call i32 asm sideeffect "", "={x28}"() nounwind
+ call preserve_mostcc void @preserve_mostcc_func()
+ call void asm sideeffect "", "{x6},{x7},{x8},{x9},{x28}"(i32 %1, i32 %2, i32 %3, i32 %4, i32 %5)
+ ret void
+}
+
+; X6, X7 and X28 will be saved to the stack.
+define void @preserve_mostcc4() nounwind {
+; RV32I-LABEL: preserve_mostcc4:
+; RV32I: # %bb.0:
+; RV32I-NEXT: addi sp, sp, -32
+; RV32I-NEXT: sw ra, 28(sp) # 4-byte Folded Spill
+; RV32I-NEXT: sw s0, 24(sp) # 4-byte Folded Spill
+; RV32I-NEXT: sw s1, 20(sp) # 4-byte Folded Spill
+; RV32I-NEXT: sw s2, 16(sp) # 4-byte Folded Spill
+; RV32I-NEXT: sw s3, 12(sp) # 4-byte Folded Spill
+; RV32I-NEXT: sw s4, 8(sp) # 4-byte Folded Spill
+; RV32I-NEXT: #APP
+; RV32I-NEXT: #NO_APP
+; RV32I-NEXT: mv s2, t1
+; RV32I-NEXT: #APP
+; RV32I-NEXT: #NO_APP
+; RV32I-NEXT: mv s3, t2
+; RV32I-NEXT: #APP
+; RV32I-NEXT: #NO_APP
+; RV32I-NEXT: #APP
+; RV32I-NEXT: #NO_APP
+; RV32I-NEXT: #APP
+; RV32I-NEXT: #NO_APP
+; RV32I-NEXT: mv s4, t3
+; RV32I-NEXT: call standard_cc_func
+; RV32I-NEXT: mv t1, s2
+; RV32I-NEXT: mv t2, s3
+; RV32I-NEXT: mv t3, s4
+; RV32I-NEXT: #APP
+; RV32I-NEXT: #NO_APP
+; RV32I-NEXT: lw ra, 28(sp) # 4-byte Folded Reload
+; RV32I-NEXT: lw s0, 24(sp) # 4-byte Folded Reload
+; RV32I-NEXT: lw s1, 20(sp) # 4-byte Folded Reload
+; RV32I-NEXT: lw s2, 16(sp) # 4-byte Folded Reload
+; RV32I-NEXT: lw s3, 12(sp) # 4-byte Folded Reload
+; RV32I-NEXT: lw s4, 8(sp) # 4-byte Folded Reload
+; RV32I-NEXT: addi sp, sp, 32
+; RV32I-NEXT: ret
+;
+; RV64I-LABEL: preserve_mostcc4:
+; RV64I: # %bb.0:
+; RV64I-NEXT: addi sp, sp, -48
+; RV64I-NEXT: sd ra, 40(sp) # 8-byte Folded Spill
+; RV64I-NEXT: sd s0, 32(sp) # 8-byte Folded Spill
+; RV64I-NEXT: sd s1, 24(sp) # 8-byte Folded Spill
+; RV64I-NEXT: sd s2, 16(sp) # 8-byte Folded Spill
+; RV64I-NEXT: sd s3, 8(sp) # 8-byte Folded Spill
+; RV64I-NEXT: sd s4, 0(sp) # 8-byte Folded Spill
+; RV64I-NEXT: #APP
+; RV64I-NEXT: #NO_APP
+; RV64I-NEXT: mv s2, t1
+; RV64I-NEXT: #APP
+; RV64I-NEXT: #NO_APP
+; RV64I-NEXT: mv s3, t2
+; RV64I-NEXT: #APP
+; RV64I-NEXT: #NO_APP
+; RV64I-NEXT: #APP
+; RV64I-NEXT: #NO_APP
+; RV64I-NEXT: #APP
+; RV64I-NEXT: #NO_APP
+; RV64I-NEXT: mv s4, t3
+; RV64I-NEXT: call standard_cc_func
+; RV64I-NEXT: mv t1, s2
+; RV64I-NEXT: mv t2, s3
+; RV64I-NEXT: mv t3, s4
+; RV64I-NEXT: #APP
+; RV64I-NEXT: #NO_APP
+; RV64I-NEXT: ld ra, 40(sp) # 8-byte Folded Reload
+; RV64I-NEXT: ld s0, 32(sp) # 8-byte Folded Reload
+; RV64I-NEXT: ld s1, 24(sp) # 8-byte Folded Reload
+; RV64I-NEXT: ld s2, 16(sp) # 8-byte Folded Reload
+; RV64I-NEXT: ld s3, 8(sp) # 8-byte Folded Reload
+; RV64I-NEXT: ld s4, 0(sp) # 8-byte Folded Reload
+; RV64I-NEXT: addi sp, sp, 48
+; RV64I-NEXT: ret
+;
+; RV32E-LABEL: preserve_mostcc4:
+; RV32E: # %bb.0:
+; RV32E-NEXT: addi sp, sp, -24
+; RV32E-NEXT: sw ra, 20(sp) # 4-byte Folded Spill
+; RV32E-NEXT: sw s0, 16(sp) # 4-byte Folded Spill
+; RV32E-NEXT: sw s1, 12(sp) # 4-byte Folded Spill
+; RV32E-NEXT: #APP
+; RV32E-NEXT: #NO_APP
+; RV32E-NEXT: sw t1, 8(sp) # 4-byte Folded Spill
+; RV32E-NEXT: #APP
+; RV32E-NEXT: #NO_APP
+; RV32E-NEXT: sw t2, 4(sp) # 4-byte Folded Spill
+; RV32E-NEXT: #APP
+; RV32E-NEXT: #NO_APP
+; RV32E-NEXT: #APP
+; RV32E-NEXT: #NO_APP
+; RV32E-NEXT: #APP
+; RV32E-NEXT: #NO_APP
+; RV32E-NEXT: sw t3, 0(sp) # 4-byte Folded Spill
+; RV32E-NEXT: call standard_cc_func
+; RV32E-NEXT: lw t1, 8(sp) # 4-byte Folded Reload
+; RV32E-NEXT: lw t2, 4(sp) # 4-byte Folded Reload
+; RV32E-NEXT: lw t3, 0(sp) # 4-byte Folded Reload
+; RV32E-NEXT: #APP
+; RV32E-NEXT: #NO_APP
+; RV32E-NEXT: lw ra, 20(sp) # 4-byte Folded Reload
+; RV32E-NEXT: lw s0, 16(sp) # 4-byte Folded Reload
+; RV32E-NEXT: lw s1, 12(sp) # 4-byte Folded Reload
+; RV32E-NEXT: addi sp, sp, 24
+; RV32E-NEXT: ret
+;
+; RV64E-LABEL: preserve_mostcc4:
+; RV64E: # %bb.0:
+; RV64E-NEXT: addi sp, sp, -48
+; RV64E-NEXT: sd ra, 40(sp) # 8-byte Folded Spill
+; RV64E-NEXT: sd s0, 32(sp) # 8-byte Folded Spill
+; RV64E-NEXT: sd s1, 24(sp) # 8-byte Folded Spill
+; RV64E-NEXT: #APP
+; RV64E-NEXT: #NO_APP
+; RV64E-NEXT: sd t1, 16(sp) # 8-byte Folded Spill
+; RV64E-NEXT: #APP
+; RV64E-NEXT: #NO_APP
+; RV64E-NEXT: sd t2, 8(sp) # 8-byte Folded Spill
+; RV64E-NEXT: #APP
+; RV64E-NEXT: #NO_APP
+; RV64E-NEXT: #APP
+; RV64E-NEXT: #NO_APP
+; RV64E-NEXT: #APP
+; RV64E-NEXT: #NO_APP
+; RV64E-NEXT: sd t3, 0(sp) # 8-byte Folded Spill
+; RV64E-NEXT: call standard_cc_func
+; RV64E-NEXT: ld t1, 16(sp) # 8-byte Folded Reload
+; RV64E-NEXT: ld t2, 8(sp) # 8-byte Folded Reload
+; RV64E-NEXT: ld t3, 0(sp) # 8-byte Folded Reload
+; RV64E-NEXT: #APP
+; RV64E-NEXT: #NO_APP
+; RV64E-NEXT: ld ra, 40(sp) # 8-byte Folded Reload
+; RV64E-NEXT: ld s0, 32(sp) # 8-byte Folded Reload
+; RV64E-NEXT: ld s1, 24(sp) # 8-byte Folded Reload
+; RV64E-NEXT: addi sp, sp, 48
+; RV64E-NEXT: ret
+ %1 = call...
[truncated]
``````````
</details>
https://github.com/llvm/llvm-project/pull/158402
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