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[ARMConstantIsland] Insert tbb/tbh optimization where previous jump table resided.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224165 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chad Rosier 2014-12-12 23:27:40 +00:00
parent 27d4d1c7bf
commit f05fc43036
2 changed files with 50 additions and 1 deletions
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4
lib/Target/ARM/ARMConstantIslandPass.cpp
View File

@ -1952,7 +1952,9 @@ bool ARMConstantIslands::optimizeThumb2JumpTables() {
DEBUG(dbgs() << "Shrink JT: " << *MI << " addr: " << *AddrMI
<< " lea: " << *LeaMI);
unsigned Opc = ByteOk ? ARM::t2TBB_JT : ARM::t2TBH_JT;
MachineInstr *NewJTMI = BuildMI(MBB, MI->getDebugLoc(), TII->get(Opc))
MachineBasicBlock::iterator MI_JT = MI;
MachineInstr *NewJTMI =
BuildMI(*MBB, MI_JT, MI->getDebugLoc(), TII->get(Opc))
.addReg(IdxReg, getKillRegState(IdxRegKill))
.addJumpTableIndex(JTI, JTOP.getTargetFlags())
.addImm(MI->getOperand(JTOpIdx+1).getImm());

47
test/CodeGen/Thumb2/constant-islands-jump-table.ll Normal file
View File

@ -0,0 +1,47 @@
; RUN: llc < %s -mtriple=thumbv7-linux-gnueabihf -O1 %s -o - | FileCheck %s
; CHECK-LABEL: test_jump_table:
; CHECK: b .LBB
; CHECK-NOT: tbh
define i32 @test_jump_table(i32 %x, float %in) {
h1:
%b0 = fadd float %in, 1234.5
%b1 = fptoui float %b0 to i32
switch i32 %x, label %h2 [
i32 0, label %h3
i32 2, label %h4
i32 4, label %h5
i32 6, label %h6
]
h2:
%a0 = add i32 %x, 5
br label %h3
h3:
%d2 = phi i32 [%b1, %h1], [%a0, %h2]
%d3 = add i32 %d2, 3
br label %h4
h4:
%c2 = phi i32 [%b1, %h1], [%d3, %h3]
%c3 = add i32 %c2, 5
br label %h5
h5:
%a2 = phi i32 [%b1, %h1], [%c3, %h4]
%a3 = add i32 %a2, 6
br label %h6
h6:
%y = phi i32 [0, %h1], [%a3, %h5]
call i32 @llvm.arm.space(i32 2000, i32 undef)
ret i32 %y
}
declare i32 @llvm.arm.space(i32, i32)