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3fc7c8cb26
The following function currently relies on tail-merging for if
conversion to succeed. The common tail of cond_true and cond_false is
extracted, and this then forms a diamond pattern that can be
successfully if converted.
If this block does not get extracted, either because tail-merging is
disabled or the threshold is higher, we should still recognize this
pattern and if-convert it.
Fixed a regression in the original commit. Need to un-reverse branches after
reversing them, or other conversions go awry.
define i32 @t2(i32 %a, i32 %b) nounwind {
entry:
%tmp1434 = icmp eq i32 %a, %b ; <i1> [#uses=1]
br i1 %tmp1434, label %bb17, label %bb.outer
bb.outer: ; preds = %cond_false, %entry
%b_addr.021.0.ph = phi i32 [ %b, %entry ], [ %tmp10, %cond_false ]
%a_addr.026.0.ph = phi i32 [ %a, %entry ], [ %a_addr.026.0, %cond_false ]
br label %bb
bb: ; preds = %cond_true, %bb.outer
%indvar = phi i32 [ 0, %bb.outer ], [ %indvar.next, %cond_true ]
%tmp. = sub i32 0, %b_addr.021.0.ph
%tmp.40 = mul i32 %indvar, %tmp.
%a_addr.026.0 = add i32 %tmp.40, %a_addr.026.0.ph
%tmp3 = icmp sgt i32 %a_addr.026.0, %b_addr.021.0.ph
br i1 %tmp3, label %cond_true, label %cond_false
cond_true: ; preds = %bb
%tmp7 = sub i32 %a_addr.026.0, %b_addr.021.0.ph
%tmp1437 = icmp eq i32 %tmp7, %b_addr.021.0.ph
%indvar.next = add i32 %indvar, 1
br i1 %tmp1437, label %bb17, label %bb
cond_false: ; preds = %bb
%tmp10 = sub i32 %b_addr.021.0.ph, %a_addr.026.0
%tmp14 = icmp eq i32 %a_addr.026.0, %tmp10
br i1 %tmp14, label %bb17, label %bb.outer
bb17: ; preds = %cond_false, %cond_true, %entry
%a_addr.026.1 = phi i32 [ %a, %entry ], [ %tmp7, %cond_true ], [ %a_addr.026.0, %cond_false ]
ret i32 %a_addr.026.1
}
Without tail-merging or diamond-tail if conversion:
LBB1_1: @ %bb
@ =>This Inner Loop Header: Depth=1
cmp r0, r1
ble LBB1_3
@ BB#2: @ %cond_true
@ in Loop: Header=BB1_1 Depth=1
subs r0, r0, r1
cmp r1, r0
it ne
cmpne r0, r1
bgt LBB1_4
LBB1_3: @ %cond_false
@ in Loop: Header=BB1_1 Depth=1
subs r1, r1, r0
cmp r1, r0
bne LBB1_1
LBB1_4: @ %bb17
bx lr
With diamond-tail if conversion, but without tail-merging:
@ BB#0: @ %entry
cmp r0, r1
it eq
bxeq lr
LBB1_1: @ %bb
@ =>This Inner Loop Header: Depth=1
cmp r0, r1
ite le
suble r1, r1, r0
subgt r0, r0, r1
cmp r1, r0
bne LBB1_1
@ BB#2: @ %bb17
bx lr
llvm-svn: 279671
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| .. | ||
| 2009-07-17-CrossRegClassCopy.ll | ||
| 2009-07-21-ISelBug.ll | ||
| 2009-07-23-CPIslandBug.ll | ||
| 2009-07-30-PEICrash.ll | ||
| 2009-08-01-WrongLDRBOpc.ll | ||
| 2009-08-02-CoalescerBug.ll | ||
| 2009-08-04-CoalescerAssert.ll | ||
| 2009-08-04-CoalescerBug.ll | ||
| 2009-08-04-ScavengerAssert.ll | ||
| 2009-08-04-SubregLoweringBug2.ll | ||
| 2009-08-04-SubregLoweringBug3.ll | ||
| 2009-08-04-SubregLoweringBug.ll | ||
| 2009-08-06-SpDecBug.ll | ||
| 2009-08-07-CoalescerBug.ll | ||
| 2009-08-07-NeonFPBug.ll | ||
| 2009-08-08-ScavengerAssert.ll | ||
| 2009-08-10-ISelBug.ll | ||
| 2009-08-21-PostRAKill4.ll | ||
| 2009-09-01-PostRAProlog.ll | ||
| 2009-09-28-ITBlockBug.ll | ||
| 2009-10-15-ITBlockBranch.ll | ||
| 2009-11-01-CopyReg2RegBug.ll | ||
| 2009-11-11-ScavengerAssert.ll | ||
| 2009-11-13-STRDBug.ll | ||
| 2009-12-01-LoopIVUsers.ll | ||
| 2010-01-06-TailDuplicateLabels.ll | ||
| 2010-01-19-RemovePredicates.ll | ||
| 2010-02-11-phi-cycle.ll | ||
| 2010-02-24-BigStack.ll | ||
| 2010-03-08-addi12-ccout.ll | ||
| 2010-03-15-AsmCCClobber.ll | ||
| 2010-04-15-DynAllocBug.ll | ||
| 2010-04-26-CopyRegCrash.ll | ||
| 2010-05-24-rsbs.ll | ||
| 2010-06-14-NEONCoalescer.ll | ||
| 2010-06-19-ITBlockCrash.ll | ||
| 2010-06-21-TailMergeBug.ll | ||
| 2010-08-10-VarSizedAllocaBug.ll | ||
| 2010-11-22-EpilogueBug.ll | ||
| 2010-12-03-AddSPNarrowing.ll | ||
| 2011-04-21-FILoweringBug.ll | ||
| 2011-06-07-TwoAddrEarlyClobber.ll | ||
| 2011-12-16-T2SizeReduceAssert.ll | ||
| 2012-01-13-CBNZBug.ll | ||
| 2013-02-19-tail-call-register-hint.ll | ||
| 2013-03-02-vduplane-nonconstant-source-index.ll | ||
| 2013-03-06-vector-sext-operand-scalarize.ll | ||
| aapcs.ll | ||
| aligned-constants.ll | ||
| aligned-spill.ll | ||
| bfi.ll | ||
| bfx.ll | ||
| bicbfi.ll | ||
| buildvector-crash.ll | ||
| carry.ll | ||
| cbnz.ll | ||
| constant-islands-jump-table.ll | ||
| constant-islands-new-island-padding.ll | ||
| constant-islands-new-island.ll | ||
| constant-islands.ll | ||
| cortex-fp.ll | ||
| crash.ll | ||
| cross-rc-coalescing-1.ll | ||
| cross-rc-coalescing-2.ll | ||
| div.ll | ||
| emit-unwinding.ll | ||
| float-cmp.ll | ||
| float-intrinsics-double.ll | ||
| float-intrinsics-float.ll | ||
| float-ops.ll | ||
| frame-pointer.ll | ||
| frameless2.ll | ||
| frameless.ll | ||
| ifcvt-compare.ll | ||
| ifcvt-neon.ll | ||
| ifcvt-rescan-bug-2016-08-22.ll | ||
| inflate-regs.ll | ||
| inlineasm.ll | ||
| large-call.ll | ||
| large-stack.ll | ||
| ldr-str-imm12.ll | ||
| lit.local.cfg | ||
| longMACt.ll | ||
| lsr-deficiency.ll | ||
| machine-licm.ll | ||
| mul_const.ll | ||
| pic-load.ll | ||
| segmented-stacks.ll | ||
| setjmp_longjmp.ll | ||
| stack_guard_remat.ll | ||
| tail-call-r9.ll | ||
| thumb2-adc.ll | ||
| thumb2-add2.ll | ||
| thumb2-add3.ll | ||
| thumb2-add4.ll | ||
| thumb2-add5.ll | ||
| thumb2-add6.ll | ||
| thumb2-add.ll | ||
| thumb2-and2.ll | ||
| thumb2-and.ll | ||
| thumb2-asr2.ll | ||
| thumb2-asr.ll | ||
| thumb2-bcc.ll | ||
| thumb2-bfc.ll | ||
| thumb2-bic.ll | ||
| thumb2-branch.ll | ||
| thumb2-call-tc.ll | ||
| thumb2-call.ll | ||
| thumb2-cbnz.ll | ||
| thumb2-clz.ll | ||
| thumb2-cmn2.ll | ||
| thumb2-cmn.ll | ||
| thumb2-cmp2.ll | ||
| thumb2-cmp.ll | ||
| thumb2-cpsr-liveness.ll | ||
| thumb2-eor2.ll | ||
| thumb2-eor.ll | ||
| thumb2-ifcvt1-tc.ll | ||
| thumb2-ifcvt1.ll | ||
| thumb2-ifcvt2.ll | ||
| thumb2-ifcvt3.ll | ||
| thumb2-jtb.ll | ||
| thumb2-ldm.ll | ||
| thumb2-ldr_ext.ll | ||
| thumb2-ldr_post.ll | ||
| thumb2-ldr_pre.ll | ||
| thumb2-ldr.ll | ||
| thumb2-ldrb.ll | ||
| thumb2-ldrd.ll | ||
| thumb2-ldrh.ll | ||
| thumb2-lsl2.ll | ||
| thumb2-lsl.ll | ||
| thumb2-lsr2.ll | ||
| thumb2-lsr3.ll | ||
| thumb2-lsr.ll | ||
| thumb2-mla.ll | ||
| thumb2-mls.ll | ||
| thumb2-mov.ll | ||
| thumb2-mul.ll | ||
| thumb2-mulhi.ll | ||
| thumb2-mvn2.ll | ||
| thumb2-mvn.ll | ||
| thumb2-neg.ll | ||
| thumb2-orn2.ll | ||
| thumb2-orn.ll | ||
| thumb2-orr2.ll | ||
| thumb2-orr.ll | ||
| thumb2-pack.ll | ||
| thumb2-rev16.ll | ||
| thumb2-rev.ll | ||
| thumb2-ror.ll | ||
| thumb2-rsb2.ll | ||
| thumb2-rsb.ll | ||
| thumb2-sbc.ll | ||
| thumb2-select_xform.ll | ||
| thumb2-select.ll | ||
| thumb2-shifter.ll | ||
| thumb2-smla.ll | ||
| thumb2-smul.ll | ||
| thumb2-spill-q.ll | ||
| thumb2-str_post.ll | ||
| thumb2-str_pre.ll | ||
| thumb2-str.ll | ||
| thumb2-strb.ll | ||
| thumb2-strh.ll | ||
| thumb2-sub2.ll | ||
| thumb2-sub3.ll | ||
| thumb2-sub4.ll | ||
| thumb2-sub5.ll | ||
| thumb2-sub.ll | ||
| thumb2-sxt_rot.ll | ||
| thumb2-sxt-uxt.ll | ||
| thumb2-tbb.ll | ||
| thumb2-tbh.ll | ||
| thumb2-teq2.ll | ||
| thumb2-teq.ll | ||
| thumb2-tst2.ll | ||
| thumb2-tst.ll | ||
| thumb2-uxt_rot.ll | ||
| thumb2-uxtb.ll | ||
| tls1.ll | ||
| tls2.ll | ||
| tpsoft.ll | ||
| v8_IT_1.ll | ||
| v8_IT_2.ll | ||
| v8_IT_3.ll | ||
| v8_IT_4.ll | ||
| v8_IT_5.ll | ||
| v8_IT_6.ll | ||