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Now Igor, throw the switch...give my creation life!

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Use the custom inserter for the ARM setjmp intrinsics. Instead of creating the
SjLj dispatch table in IR, where it frequently violates serveral assumptions --
in particular assumptions made by the landingpad instruction about what can
branch to a landing pad and what cannot. Performing this in the back-end allows
us to violate these assumptions without the IR getting angry at us.

It also allows us to perform a small optimization. We can shove the address of
the dispatch's basic block into the function context and not have to add code
around the setjmp to check for the return value and jump to the dispatch.

Neat, huh?
<rdar://problem/10116753>


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142294 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2011-10-17 22:26:23 +00:00
parent 0e387b2877
commit 13a7121858
4 changed files with 9 additions and 4 deletions
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1
lib/CodeGen/SjLjEHPrepare.cpp
View File

@ -36,6 +36,7 @@
using namespace llvm;
static cl::opt<bool> DisableOldSjLjEH("disable-old-sjlj-eh", cl::Hidden,
cl::init(true),
cl::desc("Disable the old SjLj EH preparation pass"));
STATISTIC(NumInvokes, "Number of invokes replaced");

3
lib/Target/ARM/ARMInstrInfo.td
View File

@ -4635,7 +4635,8 @@ let isCall = 1,
// no encoding information is necessary.
let Defs =
[ R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, LR, CPSR,
QQQQ0, QQQQ1, QQQQ2, QQQQ3 ], hasSideEffects = 1, isBarrier = 1 in {
QQQQ0, QQQQ1, QQQQ2, QQQQ3 ], hasSideEffects = 1, isBarrier = 1,
usesCustomInserter = 1 in {
def Int_eh_sjlj_setjmp : PseudoInst<(outs), (ins GPR:$src, GPR:$val),
NoItinerary,
[(set R0, (ARMeh_sjlj_setjmp GPR:$src, GPR:$val))]>,

3
lib/Target/ARM/ARMInstrThumb.td
View File

@ -1259,7 +1259,8 @@ def tTPsoft : tPseudoInst<(outs), (ins), 4, IIC_Br,
// preserve all of the callee-saved resgisters, which is exactly what we want.
// $val is a scratch register for our use.
let Defs = [ R0, R1, R2, R3, R4, R5, R6, R7, R12, CPSR ],
hasSideEffects = 1, isBarrier = 1, isCodeGenOnly = 1 in
hasSideEffects = 1, isBarrier = 1, isCodeGenOnly = 1,
usesCustomInserter = 1 in
def tInt_eh_sjlj_setjmp : ThumbXI<(outs),(ins tGPR:$src, tGPR:$val),
AddrModeNone, 0, NoItinerary, "","",
[(set R0, (ARMeh_sjlj_setjmp tGPR:$src, tGPR:$val))]>;

6
lib/Target/ARM/ARMInstrThumb2.td
View File

@ -3088,7 +3088,8 @@ def t2CLREX : T2I<(outs), (ins), NoItinerary, "clrex", "", []>,
let Defs =
[ R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, LR, CPSR,
QQQQ0, QQQQ1, QQQQ2, QQQQ3 ],
hasSideEffects = 1, isBarrier = 1, isCodeGenOnly = 1 in {
hasSideEffects = 1, isBarrier = 1, isCodeGenOnly = 1,
usesCustomInserter = 1 in {
def t2Int_eh_sjlj_setjmp : Thumb2XI<(outs), (ins tGPR:$src, tGPR:$val),
AddrModeNone, 0, NoItinerary, "", "",
[(set R0, (ARMeh_sjlj_setjmp tGPR:$src, tGPR:$val))]>,
@ -3097,7 +3098,8 @@ let Defs =
let Defs =
[ R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, LR, CPSR ],
hasSideEffects = 1, isBarrier = 1, isCodeGenOnly = 1 in {
hasSideEffects = 1, isBarrier = 1, isCodeGenOnly = 1,
usesCustomInserter = 1 in {
def t2Int_eh_sjlj_setjmp_nofp : Thumb2XI<(outs), (ins tGPR:$src, tGPR:$val),
AddrModeNone, 0, NoItinerary, "", "",
[(set R0, (ARMeh_sjlj_setjmp tGPR:$src, tGPR:$val))]>,