84efad0b47
This fixes https://discourse.llvm.org/t/fixed-register-being-spill-and-restored-in-clang/83058. We need to do it in `MachineRegisterInfo::getCalleeSavedRegs` instead of `RISCVRegisterInfo::getCalleeSavedRegs` since the MF argument of `TargetRegisterInfo:::getCalleeSavedRegs` is `const`, so we can't call `MF->getRegInfo().disableCalleeSavedRegister` there. So to put it in `MachineRegisterInfo::getCalleeSavedRegs`, we move `isRegisterReservedByUser` into `TargetSubtargetInfo`.
36 lines
1018 B
LLVM
36 lines
1018 B
LLVM
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
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; RUN: llc -mtriple=riscv64 -mattr=+reserve-x24 < %s | FileCheck %s
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define noundef signext i32 @foo() {
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; CHECK-LABEL: foo:
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; CHECK: # %bb.0:
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; CHECK-NEXT: li s8, 321
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; CHECK-NEXT: li a0, 0
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; CHECK-NEXT: ret
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tail call void @llvm.write_register.i64(metadata !0, i64 321)
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ret i32 0
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}
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declare void @llvm.write_register.i64(metadata, i64)
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define noundef signext i32 @bar() nounwind {
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; CHECK-LABEL: bar:
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; CHECK: # %bb.0:
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; CHECK-NEXT: addi sp, sp, -16
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; CHECK-NEXT: sd s9, 8(sp) # 8-byte Folded Spill
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; CHECK-NEXT: #APP
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; CHECK-NEXT: #NO_APP
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; CHECK-NEXT: li s8, 321
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; CHECK-NEXT: li a0, 0
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; CHECK-NEXT: ld s9, 8(sp) # 8-byte Folded Reload
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; CHECK-NEXT: addi sp, sp, 16
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; CHECK-NEXT: ret
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tail call void asm sideeffect "", "~{x25}"() #3
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tail call void @llvm.write_register.i64(metadata !0, i64 321)
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ret i32 0
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}
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!llvm.named.register.x24 = !{!0}
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!0 = !{!"x24"}
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