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llvm-project/llvm/test/CodeGen/ARM/Windows/builtin_longjmp.ll

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ARM: correct __builtin_longjmp on WoA WoA uses r11 as the FP even though it is a pure thumb-2 environment in contrast to AAPCS which states r7. This adjusts __builtin_longjmp to not clobber r7 and to properly restore the frame pointer on execution. llvm-svn: 263118
2016-03-10 23:11:09 +08:00
; RUN: llc -mtriple thumbv7--windows-itanium -filetype asm -o - %s | FileCheck %s
declare void @llvm.eh.sjlj.longjmp(i8*)
define arm_aapcs_vfpcc void @test___builtin_longjump(i8* %b) {
entry:
tail call void @llvm.eh.sjlj.longjmp(i8* %b)
unreachable
}
ARM: follow up improvements for SVN r263118 The initial change was insufficiently complete for always getting the semantics of __builtin_longjmp correct. The builtin is translated into a `tInt_eh_sjlj_longjmp` DAG node. This node set R7 as clobbered. However, the code would then follow up with a clobber of R11. I had failed to notice the imp-def,kill on R7 in the isel. Unfortunately, it seems that it is not possible to conditionalise the Defs list via an !if. Instead, construct a new parallel WIN node and prefer that when targeting windows. This ensures that we now both correctly model the __builtin_longjmp as well as construct the frame in a more ABI conformant manner. llvm-svn: 263123
2016-03-11 00:26:37 +08:00
; CHECK: push.w {r11, lr}
ARM: support high registers in __builtin_longjmp on WoA Windows on ARM uses a pure thumb-2 environment. This means that it can select a high register when doing a __builtin_longjmp. We would use a tLDRi which would truncate the register to a low register. Use a t2LDRi12 to get the full register file access. Tweak the code to just load into PC, as that is an interworking branch on all supported cores anyways. llvm-svn: 274815
2016-07-08 08:48:22 +08:00
; CHECK: ldr.w r11, [r0]
; CHECK: ldr.w sp, [r0, #8]
; CHECK: ldr.w pc, [r0, #4]
ARM: correct __builtin_longjmp on WoA WoA uses r11 as the FP even though it is a pure thumb-2 environment in contrast to AAPCS which states r7. This adjusts __builtin_longjmp to not clobber r7 and to properly restore the frame pointer on execution. llvm-svn: 263118
2016-03-10 23:11:09 +08:00