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llvm/test/CodeGen/Hexagon
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Tim Northover d113448c1d Refactor isInTailCallPosition handling 
This change came about primarily because of two issues in the existing code.
Niether of:

define i64 @test1(i64 %val) {
  %in = trunc i64 %val to i32
  tail call i32 @ret32(i32 returned %in)
  ret i64 %val
}

define i64 @test2(i64 %val) {
  tail call i32 @ret32(i32 returned undef)
  ret i32 42
}

should be tail calls, and the function sameNoopInput is responsible. The main
problem is that it is completely symmetric in the "tail call" and "ret" value,
but in reality different things are allowed on each side.

For these cases:
1. Any truncation should lead to a larger value being generated by "tail call"
   than needed by "ret".
2. Undef should only be allowed as a source for ret, not as a result of the
   call.

Along the way I noticed that a mismatch between what this function treats as a
valid truncation and what the backends see can lead to invalid calls as well
(see x86-32 test case).

This patch refactors the code so that instead of being based primarily on
values which it recurses into when necessary, it starts by inspecting the type
and considers each fundamental slot that the backend will see in turn. For
example, given a pathological function that returned {{}, {{}, i32, {}}, i32}
we would consider each "real" i32 in turn, and ask if it passes through
unchanged. This is much closer to what the backend sees as a result of
ComputeValueVTs.

Aside from the bug fixes, this eliminates the recursion that's going on and, I
believe, makes the bulk of the code significantly easier to understand. The
trade-off is the nasty iterators needed to find the real types inside a
returned value.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187787 91177308-0d34-0410-b5e6-96231b3b80d8
2013-08-06 09:12:35 +00:00
..
absaddr-store.ll Hexagon: Use multiclass for absolute addressing mode stores. 2013-02-05 18:15:34 +00:00
absimm.ll Hexagon: Remove duplicate instructions to handle global/immediate values 2013-04-23 17:11:46 +00:00
adde.ll Convert CodeGen/*/*.ll tests to use the new CHECK-LABEL for easier debugging. No functionality change and all tests pass after conversion. 2013-07-13 20:38:47 +00:00
always-ext.ll Hexagon: Use multiclass for combine and STri[bhwd]_shl_V4 instructions. 2013-04-23 21:17:40 +00:00
args.ll Hexagon: Pass to replace tranfer/copy instructions into combine instruction 2013-05-14 18:54:06 +00:00
ashift-left-right.ll Hexagon: Use multiclass for aslh, asrh, sxtb, sxth, zxtb and zxth. 2013-03-26 15:43:57 +00:00
block-addr.ll Hexagon: Add support to lower block address. 2013-03-07 19:10:28 +00:00
BranchPredict.ll Hexagon: Test case to check if branch probabilities are properly reflected in 2013-05-14 15:50:49 +00:00
cext-check.ll Hexagon: Move HexagonMCInst.h to MCTargetDesc/HexagonMCInst.h. 2013-02-20 16:13:27 +00:00
cext-valid-packet1.ll Hexagon: Add constant extender support framework. 2013-03-01 17:37:13 +00:00
cext-valid-packet2.ll Hexagon: Add constant extender support framework. 2013-03-01 17:37:13 +00:00
cmp_pred2.ll Hexagon: Remove assembler mapped instruction definitions. 2013-04-23 19:15:55 +00:00
cmp_pred_reg.ll Hexagon: Use TFR_cond with cmpb.[eq,gt,gtu] to handle 2013-02-05 19:20:45 +00:00
cmp_pred.ll Hexagon: Use TFR_cond with cmpb.[eq,gt,gtu] to handle 2013-02-05 19:20:45 +00:00
cmp-to-genreg.ll Hexagon: Add V4 compare instructions. Enable relationship mapping 2013-02-05 16:42:24 +00:00
cmp-to-predreg.ll Hexagon: Add V4 compare instructions. Enable relationship mapping 2013-02-05 16:42:24 +00:00
cmpb_pred.ll TBAA: remove !tbaa from testing cases if not used. 2013-04-30 17:52:57 +00:00
combine_ir.ll Hexagon - Add peephole optimizations for zero extends. 2013-05-02 20:22:51 +00:00
combine.ll Enable all Hexagon tests. 2012-05-15 16:13:12 +00:00
convertdptoint.ll Hexagon V5 FP Support. 2012-05-10 20:20:25 +00:00
convertdptoll.ll Hexagon V5 FP Support. 2012-05-10 20:20:25 +00:00
convertsptoint.ll Hexagon V5 FP Support. 2012-05-10 20:20:25 +00:00
convertsptoll.ll Hexagon V5 FP Support. 2012-05-10 20:20:25 +00:00
ctlz-cttz-ctpop.ll Hexagon: Expand cttz, ctlz, and ctpop for now. 2013-02-21 19:39:40 +00:00
dadd.ll Hexagon V5 FP Support. 2012-05-10 20:20:25 +00:00
dmul.ll Hexagon V5 FP Support. 2012-05-10 20:20:25 +00:00
double.ll Enable all Hexagon tests. 2012-05-15 16:13:12 +00:00
doubleconvert-ieee-rnd-near.ll Hexagon V5 FP Support. 2012-05-10 20:20:25 +00:00
dsub.ll Hexagon V5 FP Support. 2012-05-10 20:20:25 +00:00
dualstore.ll Hexagon: Add encoding bits to the TFR64 instructions. 2013-03-05 18:42:28 +00:00
extload-combine.ll Hexagon: Add patterns to generate 'combine' instructions. 2013-05-14 17:16:38 +00:00
fadd.ll Hexagon V5 FP Support. 2012-05-10 20:20:25 +00:00
fcmp.ll Hexagon V5 FP Support. 2012-05-10 20:20:25 +00:00
float.ll Enable all Hexagon tests. 2012-05-15 16:13:12 +00:00
floatconvert-ieee-rnd-near.ll Enable all Hexagon tests. 2012-05-15 16:13:12 +00:00
fmul.ll Hexagon V5 FP Support. 2012-05-10 20:20:25 +00:00
frame.ll Enable all Hexagon tests. 2012-05-15 16:13:12 +00:00
fsub.ll Hexagon V5 FP Support. 2012-05-10 20:20:25 +00:00
fusedandshift.ll Support for target dependent Hexagon VLIW packetizer. 2012-05-03 21:52:53 +00:00
gp-plus-offset-load.ll Hexagon: Use absolute addressing mode loads/stores for global+offset 2013-02-13 21:38:46 +00:00
gp-plus-offset-store.ll Hexagon: Use absolute addressing mode loads/stores for global+offset 2013-02-13 21:38:46 +00:00
gp-rel.ll Hexagon: Use multiclass for gp-relative instructions. 2013-03-28 16:25:57 +00:00
hwloop-cleanup.ll Extend Hexagon hardware loop generation to handle various additional cases: 2013-02-11 21:37:55 +00:00
hwloop-const.ll TBAA: remove !tbaa from testing cases if not used. 2013-04-30 17:52:57 +00:00
hwloop-dbg.ll Debug Info Verifier: verify SPs in llvm.dbg.sp. 2013-07-27 01:26:08 +00:00
hwloop-le.ll Extend Hexagon hardware loop generation to handle various additional cases: 2013-02-11 21:37:55 +00:00
hwloop-lt1.ll Extend Hexagon hardware loop generation to handle various additional cases: 2013-02-11 21:37:55 +00:00
hwloop-lt.ll Extend Hexagon hardware loop generation to handle various additional cases: 2013-02-11 21:37:55 +00:00
hwloop-ne.ll Extend Hexagon hardware loop generation to handle various additional cases: 2013-02-11 21:37:55 +00:00
i1_VarArg.ll Convert CodeGen/*/*.ll tests to use the new CHECK-LABEL for easier debugging. No functionality change and all tests pass after conversion. 2013-07-13 20:38:47 +00:00
i8_VarArg.ll Convert CodeGen/*/*.ll tests to use the new CHECK-LABEL for easier debugging. No functionality change and all tests pass after conversion. 2013-07-13 20:38:47 +00:00
i16_VarArg.ll Convert CodeGen/*/*.ll tests to use the new CHECK-LABEL for easier debugging. No functionality change and all tests pass after conversion. 2013-07-13 20:38:47 +00:00
idxload-with-zero-offset.ll Hexagon: Test case to confirm generation of indexed loads with zero offset. 2013-02-01 16:40:06 +00:00
indirect-br.ll Convert CodeGen/*/*.ll tests to use the new CHECK-LABEL for easier debugging. No functionality change and all tests pass after conversion. 2013-07-13 20:38:47 +00:00
lit.local.cfg Continue cleanup of LIT, getting rid of the remaining artifacts from dejagnu 2012-03-25 09:02:19 +00:00
macint.ll Support for target dependent Hexagon VLIW packetizer. 2012-05-03 21:52:53 +00:00
memops1.ll Hexagon: Add and enable memops setbit, clrbit, &,|,+,- for byte, short, and word. 2013-03-22 18:41:34 +00:00
memops2.ll TBAA: remove !tbaa from testing cases if not used. 2013-04-30 17:52:57 +00:00
memops3.ll TBAA: remove !tbaa from testing cases if not used. 2013-04-30 17:52:57 +00:00
memops.ll Hexagon: Add and enable memops setbit, clrbit, &,|,+,- for byte, short, and word. 2013-03-22 18:41:34 +00:00
misaligned-access.ll Hexagon: Removed asserts regarding alignment and offset. 2013-03-14 19:08:03 +00:00
mpy.ll Enable all Hexagon tests. 2012-05-15 16:13:12 +00:00
newvaluejump2.ll Support for Hexagon feature, New Value Jump. 2012-05-12 05:10:30 +00:00
newvaluejump.ll Remove extra MayLoad/MayStore flags from atomic_load/store. 2012-08-28 03:11:32 +00:00
newvaluestore.ll Porting Hexagon MI Scheduler to the new API. 2012-09-04 14:49:56 +00:00
opt-fabs.ll Add test triples to fix win32 failures. Revert workaround from r161292. 2012-08-08 20:31:37 +00:00
opt-fneg.ll Hexagon V5 FP Support. 2012-05-10 20:20:25 +00:00
packetize_cond_inst.ll Hexagon: ArePredicatesComplement should not restrict itself to TFRs. 2013-05-14 16:36:34 +00:00
postinc-load.ll In hexagon convertToHardwareLoop, don't deref end() iterator 2012-12-07 21:03:15 +00:00
postinc-store.ll Hexagon: Add testcase for post-increment store instructions. 2013-02-05 18:23:51 +00:00
pred-absolute-store.ll Hexagon: Add support to generate predicated absolute addressing mode 2013-02-12 16:06:23 +00:00
pred-gp.ll Hexagon: Fix switch cases in HexagonVLIWPacketizer.cpp. 2013-05-10 20:27:34 +00:00
pred-instrs.ll Hexagon: Use relation map for getMatchingCondBranchOpcode() and 2013-05-09 18:25:44 +00:00
predicate-copy.ll Hexagon: add support for predicate-GPR copies. 2013-02-13 22:56:34 +00:00
remove_lsr.ll TBAA: remove !tbaa from testing cases if not used. 2013-04-30 17:52:57 +00:00
simpletailcall.ll [Hexagon] Don't mark callee saved registers as clobbered by a tail call 2012-08-13 19:54:01 +00:00
split-const32-const64.ll Hexagon: Fix Small Data support to handle -G 0 correctly. 2013-05-07 19:53:00 +00:00
static.ll Porting Hexagon MI Scheduler to the new API. 2012-09-04 14:49:56 +00:00
struct_args_large.ll Enable all Hexagon tests. 2012-05-15 16:13:12 +00:00
struct_args.ll Hexagon: Add V4 combine instructions and some more Def Pats for V2. 2013-02-04 15:52:56 +00:00
sube.ll Convert CodeGen/*/*.ll tests to use the new CHECK-LABEL for easier debugging. No functionality change and all tests pass after conversion. 2013-07-13 20:38:47 +00:00
tail-call-trunc.ll Refactor isInTailCallPosition handling 2013-08-06 09:12:35 +00:00
tfr-to-combine.ll Hexagon: Pass to replace tranfer/copy instructions into combine instruction 2013-05-14 18:54:06 +00:00
union-1.ll Hexagon - Add peephole optimizations for zero extends. 2013-05-02 20:22:51 +00:00
vaddh.ll Enable all Hexagon tests. 2012-05-15 16:13:12 +00:00
validate-offset.ll Add indexed load/store instructions for offset validation check. 2013-01-17 18:42:37 +00:00
zextloadi1.ll Convert CodeGen/*/*.ll tests to use the new CHECK-LABEL for easier debugging. No functionality change and all tests pass after conversion. 2013-07-13 20:38:47 +00:00