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tbb / tbh instructions only branch forward, not backwards.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77522 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2009-07-29 23:20:20 +00:00
parent d600522608
commit 8770f747a9
3 changed files with 128 additions and 2 deletions
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6
lib/Target/ARM/ARMConstantIslandPass.cpp
View File

@ -1358,10 +1358,12 @@ bool ARMConstantIslands::OptimizeThumb2JumpTables(MachineFunction &MF) {
for (unsigned j = 0, ee = JTBBs.size(); j != ee; ++j) {
MachineBasicBlock *MBB = JTBBs[j];
unsigned DstOffset = BBOffsets[MBB->getNumber()];
if (ByteOk && !OffsetIsInRange(JTOffset, DstOffset, (1<<8)-1, true, false))
// Negative offset is not ok. FIXME: We should change BB layout to make
// sure all the branches are forward.
if (ByteOk && !OffsetIsInRange(JTOffset, DstOffset, (1<<8)-1, false))
ByteOk = false;
if (HalfWordOk &&
!OffsetIsInRange(JTOffset, DstOffset, (1<<16)-1, true, false))
!OffsetIsInRange(JTOffset, DstOffset, (1<<16)-1, false))
HalfWordOk = false;
if (!ByteOk && !HalfWordOk)
break;

120
test/CodeGen/Thumb2/thumb2-jtb.ll Normal file
View File

@ -0,0 +1,120 @@
; RUN: llvm-as < %s | llc -march=thumb -mattr=+thumb2 | not grep tbb
; Do not use tbb / tbh if any destination is before the jumptable.
; rdar://7102917
define i16 @main__getopt_internal_2E_exit_2E_ce(i32) nounwind {
newFuncRoot:
br label %_getopt_internal.exit.ce
codeRepl127.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 0
parse_options.exit.loopexit.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 1
bb1.i.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 2
bb90.i.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 3
codeRepl104.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 4
codeRepl113.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 5
codeRepl51.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 6
codeRepl70.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 7
codeRepl119.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 8
codeRepl93.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 9
codeRepl101.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 10
codeRepl120.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 11
codeRepl89.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 12
codeRepl45.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 13
codeRepl58.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 14
codeRepl46.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 15
codeRepl50.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 16
codeRepl52.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 17
codeRepl53.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 18
codeRepl61.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 19
codeRepl85.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 20
codeRepl97.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 21
codeRepl79.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 22
codeRepl102.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 23
codeRepl54.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 24
codeRepl57.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 25
codeRepl103.exitStub: ; preds = %_getopt_internal.exit.ce
ret i16 26
_getopt_internal.exit.ce: ; preds = %newFuncRoot
switch i32 %0, label %codeRepl127.exitStub [
i32 -1, label %parse_options.exit.loopexit.exitStub
i32 0, label %bb1.i.exitStub
i32 63, label %bb90.i.exitStub
i32 66, label %codeRepl104.exitStub
i32 67, label %codeRepl113.exitStub
i32 71, label %codeRepl51.exitStub
i32 77, label %codeRepl70.exitStub
i32 78, label %codeRepl119.exitStub
i32 80, label %codeRepl93.exitStub
i32 81, label %codeRepl101.exitStub
i32 82, label %codeRepl120.exitStub
i32 88, label %codeRepl89.exitStub
i32 97, label %codeRepl45.exitStub
i32 98, label %codeRepl58.exitStub
i32 99, label %codeRepl46.exitStub
i32 100, label %codeRepl50.exitStub
i32 104, label %codeRepl52.exitStub
i32 108, label %codeRepl53.exitStub
i32 109, label %codeRepl61.exitStub
i32 110, label %codeRepl85.exitStub
i32 111, label %codeRepl97.exitStub
i32 113, label %codeRepl79.exitStub
i32 114, label %codeRepl102.exitStub
i32 115, label %codeRepl54.exitStub
i32 116, label %codeRepl57.exitStub
i32 118, label %codeRepl103.exitStub
]
}

4
test/CodeGen/Thumb2/thumb2-tbh.ll
View File

@ -1,5 +1,9 @@
; RUN: llvm-as < %s | llc -mtriple=thumbv7-apple-darwin -relocation-model=pic | FileCheck %s
; Thumb2 target should reorder the bb's in order to use tbb / tbh.
; XFAIL: *
%struct.R_flstr = type { i32, i32, i8* }
%struct._T_tstr = type { i32, %struct.R_flstr*, %struct._T_tstr* }
@_C_nextcmd = external global i32 ; <i32*> [#uses=3]