Summary:
Until this commit, these have lowered to a call to abort().
`llvm.trap()` now lowers to `unimp`, which should trap on all systems.
`llvm.debugtrap()` now lowers to `ebreak`, which is exactly what this
instruction is for.
Reviewers: asb, luismarques
Reviewed By: asb
Subscribers: hiraditya, rbar, johnrusso, simoncook, apazos, sabuasal, niosHD, kito-cheng, shiva0217, jrtc27, MaskRay, zzheng, edward-jones, rogfer01, MartinMosbeck, brucehoult, the_o, rkruppe, PkmX, jocewei, psnobl, benna, Jim, s.egerton, pzheng, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D69390
setOperationAction(ISD::READCYCLECOUNTER, MVT::i64,
Subtarget.is64Bit() ? Legal : Custom);
+ setOperationAction(ISD::TRAP, MVT::Other, Legal);
+ setOperationAction(ISD::DEBUGTRAP, MVT::Other, Legal);
+
if (Subtarget.hasStdExtA()) {
setMaxAtomicSizeInBitsSupported(Subtarget.getXLen());
setMinCmpXchgSizeInBits(32);
mayLoad = 0, mayStore = 0, hasNoSchedulingInfo = 1 in
def ReadCycleWide : Pseudo<(outs GPR:$lo, GPR:$hi), (ins), [], "", "">;
+/// traps
+
+// We lower `trap` to `unimp`, as this causes a hard exception on nearly all
+// systems.
+def : Pat<(trap), (UNIMP)>;
+
+// We lower `debugtrap` to `ebreak`, as this will get the attention of the
+// debugger if possible.
+def : Pat<(debugtrap), (EBREAK)>;
+
//===----------------------------------------------------------------------===//
// Standard extensions
//===----------------------------------------------------------------------===//
--- /dev/null
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=riscv32 -verify-machineinstrs < %s \
+; RUN: | FileCheck -check-prefix=RV32I %s
+; RUN: llc -mtriple=riscv64 -verify-machineinstrs < %s \
+; RUN: | FileCheck -check-prefix=RV64I %s
+
+; Verify that we lower @llvm.trap() and @llvm.debugtrap() correctly.
+
+declare void @llvm.trap()
+declare void @llvm.debugtrap()
+
+define void @test_trap() nounwind {
+; RV32I-LABEL: test_trap:
+; RV32I: # %bb.0:
+; RV32I-NEXT: unimp
+; RV32I-NEXT: ret
+;
+; RV64I-LABEL: test_trap:
+; RV64I: # %bb.0:
+; RV64I-NEXT: unimp
+; RV64I-NEXT: ret
+ tail call void @llvm.trap()
+ ret void
+}
+
+define void @test_debugtrap() nounwind {
+; RV32I-LABEL: test_debugtrap:
+; RV32I: # %bb.0:
+; RV32I-NEXT: ebreak
+; RV32I-NEXT: ret
+;
+; RV64I-LABEL: test_debugtrap:
+; RV64I: # %bb.0:
+; RV64I-NEXT: ebreak
+; RV64I-NEXT: ret
+ tail call void @llvm.debugtrap()
+ ret void
+}