caio/clang-p2996
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
Files
dda73336ad22bd0b5ecda17040c50fb10fcbe5fb
clang-p2996/llvm/test/Transforms/StructurizeCFG/workarounds/needs-fr-ule.ll
Brendon Cahoon f59205aef9 [BasicBlockUtils] Add a new way for CreateControlFlowHub() 
The existing way of creating the predicate in the guard blocks uses
a boolean value per outgoing block. This increases the number of live
booleans as the number of outgoing blocks increases. The new way added
in this change is to store one integer to represent the outgoing block
we want to branch to, then at each guard block, an integer equality
check is performed to decide which a specific outgoing block is taken.

Using an integer reduces the number of live values and decreases
register pressure especially in cases where there are a large number
of outgoing blocks. The integer based approach is used when the
number of outgoing blocks crosses a threshold, which is currently set
to 32.

Patch by Ruiling Song.

Differential review: https://reviews.llvm.org/D127831
2022-10-31 08:58:54 -05:00

195 lines
8.3 KiB
LLVM
Raw Blame History

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -fix-irreducible -unify-loop-exits -structurizecfg -S | FileCheck %s
define void @irreducible_mountain_bug(i1 %Pred0, i1 %Pred1, i1 %Pred2, i1 %Pred3, i1 %Pred4, i1 %Pred5, i1 %Pred6, i1 %Pred7, i1 %Pred8, i1 %Pred9, i1 %Pred10, i1 %Pred11, i1 %Pred12, i1 %Pred13) {
; CHECK-LABEL: @irreducible_mountain_bug(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[PRED0_INV:%.*]] = xor i1 [[PRED0:%.*]], true
; CHECK-NEXT: [[PRED1_INV:%.*]] = xor i1 [[PRED1:%.*]], true
; CHECK-NEXT: [[PRED2_INV:%.*]] = xor i1 [[PRED2:%.*]], true
; CHECK-NEXT: [[PRED3_INV:%.*]] = xor i1 [[PRED3:%.*]], true
; CHECK-NEXT: [[PRED5_INV:%.*]] = xor i1 [[PRED5:%.*]], true
; CHECK-NEXT: [[PRED4_INV:%.*]] = xor i1 [[PRED4:%.*]], true
; CHECK-NEXT: [[PRED10_INV:%.*]] = xor i1 [[PRED10:%.*]], true
; CHECK-NEXT: [[PRED11_INV:%.*]] = xor i1 [[PRED11:%.*]], true
; CHECK-NEXT: [[PRED12_INV:%.*]] = xor i1 [[PRED12:%.*]], true
; CHECK-NEXT: [[PRED13_INV:%.*]] = xor i1 [[PRED13:%.*]], true
; CHECK-NEXT: br i1 [[PRED0_INV]], label [[IF_THEN:%.*]], label [[FLOW19:%.*]]
; CHECK: Flow19:
; CHECK-NEXT: [[TMP0:%.*]] = phi i1 [ false, [[FLOW3:%.*]] ], [ true, [[ENTRY:%.*]] ]
; CHECK-NEXT: br i1 [[TMP0]], label [[IF_END:%.*]], label [[FLOW20:%.*]]
; CHECK: if.end:
; CHECK-NEXT: br i1 [[PRED1_INV]], label [[IF_ELSE:%.*]], label [[FLOW18:%.*]]
; CHECK: Flow18:
; CHECK-NEXT: [[TMP1:%.*]] = phi i1 [ false, [[IF_ELSE]] ], [ true, [[IF_END]] ]
; CHECK-NEXT: br i1 [[TMP1]], label [[IF_THEN7:%.*]], label [[IF_END16:%.*]]
; CHECK: if.then7:
; CHECK-NEXT: br label [[IF_END16]]
; CHECK: if.else:
; CHECK-NEXT: br label [[FLOW18]]
; CHECK: Flow20:
; CHECK-NEXT: br label [[EXIT:%.*]]
; CHECK: if.end16:
; CHECK-NEXT: br i1 [[PRED2_INV]], label [[IF_THEN39:%.*]], label [[FLOW16:%.*]]
; CHECK: Flow16:
; CHECK-NEXT: [[TMP2:%.*]] = phi i1 [ false, [[FLOW5:%.*]] ], [ true, [[IF_END16]] ]
; CHECK-NEXT: br i1 [[TMP2]], label [[WHILE_COND_PREHEADER:%.*]], label [[FLOW17:%.*]]
; CHECK: while.cond.preheader:
; CHECK-NEXT: br label [[WHILE_COND:%.*]]
; CHECK: Flow17:
; CHECK-NEXT: br label [[FLOW20]]
; CHECK: while.cond:
; CHECK-NEXT: br i1 [[PRED3_INV]], label [[LOR_RHS:%.*]], label [[FLOW12:%.*]]
; CHECK: Flow7:
; CHECK-NEXT: [[TMP3:%.*]] = phi i1 [ false, [[COND_END61:%.*]] ], [ undef, [[IRR_GUARD:%.*]] ]
; CHECK-NEXT: [[TMP4:%.*]] = phi i1 [ true, [[COND_END61]] ], [ undef, [[IRR_GUARD]] ]
; CHECK-NEXT: [[TMP5:%.*]] = phi i1 [ [[PRED7:%.*]], [[COND_END61]] ], [ false, [[IRR_GUARD]] ]
; CHECK-NEXT: [[TMP6:%.*]] = phi i1 [ false, [[COND_END61]] ], [ true, [[IRR_GUARD]] ]
; CHECK-NEXT: br i1 [[TMP6]], label [[COND_TRUE49:%.*]], label [[FLOW8:%.*]]
; CHECK: cond.true49:
; CHECK-NEXT: br label [[FLOW8]]
; CHECK: Flow8:
; CHECK-NEXT: [[TMP7:%.*]] = phi i1 [ false, [[COND_TRUE49]] ], [ [[TMP3]], [[FLOW7:%.*]] ]
; CHECK-NEXT: [[TMP8:%.*]] = phi i1 [ false, [[COND_TRUE49]] ], [ [[TMP4]], [[FLOW7]] ]
; CHECK-NEXT: [[TMP9:%.*]] = phi i1 [ [[PRED4_INV]], [[COND_TRUE49]] ], [ [[TMP5]], [[FLOW7]] ]
; CHECK-NEXT: br i1 [[TMP9]], label [[WHILE_BODY63:%.*]], label [[FLOW9:%.*]]
; CHECK: while.body63:
; CHECK-NEXT: br i1 [[PRED5_INV]], label [[WHILE_COND47:%.*]], label [[FLOW10:%.*]]
; CHECK: Flow9:
; CHECK-NEXT: [[TMP10:%.*]] = phi i1 [ [[TMP22:%.*]], [[FLOW10]] ], [ undef, [[FLOW8]] ]
; CHECK-NEXT: [[TMP11:%.*]] = phi i1 [ true, [[FLOW10]] ], [ [[TMP7]], [[FLOW8]] ]
; CHECK-NEXT: [[TMP12:%.*]] = phi i1 [ false, [[FLOW10]] ], [ [[TMP8]], [[FLOW8]] ]
; CHECK-NEXT: [[TMP13:%.*]] = phi i1 [ false, [[FLOW10]] ], [ undef, [[FLOW8]] ]
; CHECK-NEXT: [[TMP14:%.*]] = phi i1 [ [[TMP23:%.*]], [[FLOW10]] ], [ true, [[FLOW8]] ]
; CHECK-NEXT: [[DOTINV11:%.*]] = xor i1 [[TMP11]], true
; CHECK-NEXT: [[DOTINV:%.*]] = xor i1 [[TMP12]], true
; CHECK-NEXT: br i1 [[TMP14]], label [[LOOP_EXIT_GUARD1:%.*]], label [[IRR_GUARD]]
; CHECK: while.cond47:
; CHECK-NEXT: br label [[FLOW10]]
; CHECK: cond.end61:
; CHECK-NEXT: br label [[FLOW7]]
; CHECK: Flow14:
; CHECK-NEXT: [[TMP15:%.*]] = phi i1 [ [[TMP20:%.*]], [[FLOW15:%.*]] ], [ undef, [[LOOP_EXIT_GUARD1]] ]
; CHECK-NEXT: [[TMP16:%.*]] = phi i1 [ [[TMP21:%.*]], [[FLOW15]] ], [ [[DOTINV]], [[LOOP_EXIT_GUARD1]] ]
; CHECK-NEXT: br label [[FLOW13:%.*]]
; CHECK: if.then69:
; CHECK-NEXT: br label [[FLOW15]]
; CHECK: lor.rhs:
; CHECK-NEXT: br label [[FLOW12]]
; CHECK: while.end76:
; CHECK-NEXT: br label [[FLOW6:%.*]]
; CHECK: if.then39:
; CHECK-NEXT: br i1 [[PRED10_INV]], label [[IF_END_I145:%.*]], label [[FLOW5]]
; CHECK: if.end.i145:
; CHECK-NEXT: br i1 [[PRED11_INV]], label [[IF_END8_I149:%.*]], label [[FLOW4:%.*]]
; CHECK: if.end8.i149:
; CHECK-NEXT: br label [[FLOW4]]
; CHECK: if.then:
; CHECK-NEXT: br i1 [[PRED12_INV]], label [[IF_END_I:%.*]], label [[FLOW3]]
; CHECK: if.end.i:
; CHECK-NEXT: br i1 [[PRED13_INV]], label [[IF_END8_I:%.*]], label [[FLOW:%.*]]
; CHECK: if.end8.i:
; CHECK-NEXT: br label [[FLOW]]
; CHECK: Flow:
; CHECK-NEXT: br label [[FLOW3]]
; CHECK: Flow3:
; CHECK-NEXT: br label [[FLOW19]]
; CHECK: Flow4:
; CHECK-NEXT: br label [[FLOW5]]
; CHECK: Flow5:
; CHECK-NEXT: br label [[FLOW16]]
; CHECK: Flow6:
; CHECK-NEXT: br label [[FLOW17]]
; CHECK: exit:
; CHECK-NEXT: ret void
; CHECK: Flow12:
; CHECK-NEXT: [[TMP17:%.*]] = phi i1 [ true, [[LOR_RHS]] ], [ undef, [[WHILE_COND]] ]
; CHECK-NEXT: [[TMP18:%.*]] = phi i1 [ false, [[LOR_RHS]] ], [ true, [[WHILE_COND]] ]
; CHECK-NEXT: [[TMP19:%.*]] = phi i1 [ [[PRED9:%.*]], [[LOR_RHS]] ], [ [[PRED3]], [[WHILE_COND]] ]
; CHECK-NEXT: br i1 [[TMP19]], label [[IRR_GUARD]], label [[FLOW13]]
; CHECK: irr.guard:
; CHECK-NEXT: [[GUARD_COND_TRUE49:%.*]] = phi i1 [ [[TMP10]], [[FLOW9]] ], [ [[TMP18]], [[FLOW12]] ]
; CHECK-NEXT: [[GUARD_COND_TRUE49_INV:%.*]] = xor i1 [[GUARD_COND_TRUE49]], true
; CHECK-NEXT: br i1 [[GUARD_COND_TRUE49_INV]], label [[COND_END61]], label [[FLOW7]]
; CHECK: Flow15:
; CHECK-NEXT: [[TMP20]] = phi i1 [ false, [[IF_THEN69:%.*]] ], [ [[TMP13]], [[LOOP_EXIT_GUARD2:%.*]] ]
; CHECK-NEXT: [[TMP21]] = phi i1 [ [[PRED8:%.*]], [[IF_THEN69]] ], [ [[DOTINV]], [[LOOP_EXIT_GUARD2]] ]
; CHECK-NEXT: br label [[FLOW14:%.*]]
; CHECK: loop.exit.guard:
; CHECK-NEXT: br i1 [[TMP24:%.*]], label [[WHILE_END76:%.*]], label [[FLOW6]]
; CHECK: Flow10:
; CHECK-NEXT: [[TMP22]] = phi i1 [ [[PRED6:%.*]], [[WHILE_COND47]] ], [ undef, [[WHILE_BODY63]] ]
; CHECK-NEXT: [[TMP23]] = phi i1 [ false, [[WHILE_COND47]] ], [ true, [[WHILE_BODY63]] ]
; CHECK-NEXT: br label [[FLOW9]]
; CHECK: Flow13:
; CHECK-NEXT: [[TMP24]] = phi i1 [ [[TMP15]], [[FLOW14]] ], [ [[TMP17]], [[FLOW12]] ]
; CHECK-NEXT: [[TMP25:%.*]] = phi i1 [ [[TMP16]], [[FLOW14]] ], [ true, [[FLOW12]] ]
; CHECK-NEXT: br i1 [[TMP25]], label [[LOOP_EXIT_GUARD:%.*]], label [[WHILE_COND]]
; CHECK: loop.exit.guard1:
; CHECK-NEXT: br i1 [[DOTINV]], label [[LOOP_EXIT_GUARD2]], label [[FLOW14]]
; CHECK: loop.exit.guard2:
; CHECK-NEXT: br i1 [[DOTINV11]], label [[IF_THEN69]], label [[FLOW15]]
;
entry:
br i1 %Pred0, label %if.end, label %if.then
if.end:
br i1 %Pred1, label %if.then7, label %if.else
if.then7:
br label %if.end16
if.else:
br label %if.end16
if.end16:
br i1 %Pred2, label %while.cond.preheader, label %if.then39
while.cond.preheader:
br label %while.cond
while.cond:
br i1 %Pred3, label %cond.true49, label %lor.rhs
cond.true49:
br i1 %Pred4, label %if.then69, label %while.body63
while.body63:
br i1 %Pred5, label %exit, label %while.cond47
while.cond47:
br i1 %Pred6, label %cond.true49, label %cond.end61
cond.end61:
br i1 %Pred7, label %while.body63, label %while.cond
if.then69:
br i1 %Pred8, label %exit, label %while.cond
lor.rhs:
br i1 %Pred9, label %cond.end61, label %while.end76
while.end76:
br label %exit
if.then39:
br i1 %Pred10, label %exit, label %if.end.i145
if.end.i145:
br i1 %Pred11, label %exit, label %if.end8.i149
if.end8.i149:
br label %exit
if.then:
br i1 %Pred12, label %exit, label %if.end.i
if.end.i:
br i1 %Pred13, label %exit, label %if.end8.i
if.end8.i:
br label %exit
exit:
ret void
}
Reference in New Issue View Git Blame Copy Permalink