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This intrinsic permits the emission of platform specific undefined sequences. ARM has reserved the 0xde opcode which takes a single integer parameter (ignored by the CPU). This permits the operating system to implement custom behaviour on this trap. The llvm.arm.undefined intrinsic is meant to provide a means for generating the target specific behaviour from the frontend. This is particularly useful for Windows on ARM which has made use of a series of these special opcodes. llvm-svn: 209390
15 lines
363 B
LLVM
15 lines
363 B
LLVM
; RUN: llc -mtriple armv7-eabi -o - %s | FileCheck %s
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; RUN: llc -mtriple thumbv6m-eabi -o - %s | FileCheck %s
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; RUN: llc -mtriple thumbv7-eabi -o - %s | FileCheck %s
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declare void @llvm.arm.undefined(i32) nounwind
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define void @undefined_trap() {
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entry:
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tail call void @llvm.arm.undefined(i32 254)
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ret void
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}
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; CHECK-LABEL: undefined_trap
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; CHECK: udf #254
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