llvm-mirror/test/Transforms/FixIrreducible/basic.ll
Sameer Sahasrabuddhe ba6d13ef23 Introduce fix-irreducible pass
An irreducible SCC is one which has multiple "header" blocks, i.e., blocks
with control-flow edges incident from outside the SCC. This pass converts an
irreducible SCC into a natural loop by introducing a single new header
block and redirecting all the edges on the original headers to this
new block.

This is a useful workaround for a limitation in the structurizer
which, which produces incorrect control flow in the presence of
irreducible regions. The AMDGPU backend provides an option to
enable this pass before the structurizer, which may eventually be
enabled by default.

Reviewed By: nhaehnle

Differential Revision: https://reviews.llvm.org/D77198

This restores commit 2ada8e2525dd2653f30c8696a27162a3b1647d66.

Originally reverted with commit 44e09b59b869a91bf47d76e8bc569d9ee91ad145.
2020-04-15 15:05:51 +05:30

269 lines
9.3 KiB
LLVM

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -fix-irreducible -S | FileCheck %s -check-prefix=CHECK
define i32 @basic(i1 %PredEntry, i1 %PredLeft, i1 %PredRight, i32 %X, i32 %Y) {
; CHECK-LABEL: @basic(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[IRR_GUARD:%.*]]
; CHECK: left:
; CHECK-NEXT: [[L:%.*]] = add i32 [[L_PHI_MOVED:%.*]], 1
; CHECK-NEXT: br i1 [[PREDLEFT:%.*]], label [[IRR_GUARD]], label [[EXIT:%.*]]
; CHECK: right:
; CHECK-NEXT: br i1 [[PREDRIGHT:%.*]], label [[IRR_GUARD]], label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: [[Z:%.*]] = phi i32 [ [[L]], [[LEFT:%.*]] ], [ [[R_PHI_MOVED:%.*]], [[RIGHT:%.*]] ]
; CHECK-NEXT: ret i32 [[Z]]
; CHECK: irr.guard:
; CHECK-NEXT: [[GUARD_LEFT:%.*]] = phi i1 [ true, [[RIGHT]] ], [ [[PREDENTRY:%.*]], [[ENTRY:%.*]] ], [ false, [[LEFT]] ]
; CHECK-NEXT: [[L_PHI_MOVED]] = phi i32 [ [[R_PHI_MOVED]], [[RIGHT]] ], [ [[X:%.*]], [[ENTRY]] ], [ [[L_PHI_MOVED]], [[LEFT]] ]
; CHECK-NEXT: [[R_PHI_MOVED]] = phi i32 [ [[R_PHI_MOVED]], [[RIGHT]] ], [ [[Y:%.*]], [[ENTRY]] ], [ [[L]], [[LEFT]] ]
; CHECK-NEXT: br i1 [[GUARD_LEFT]], label [[LEFT]], label [[RIGHT]]
;
entry:
br i1 %PredEntry, label %left, label %right
left:
%L.phi = phi i32 [%X, %entry], [%R.phi, %right]
%L = add i32 %L.phi, 1
br i1 %PredLeft, label %right, label %exit
right:
%R.phi = phi i32 [%Y, %entry], [%L, %left]
br i1 %PredRight, label %left, label %exit
exit:
%Z = phi i32 [%L, %left], [%R.phi, %right]
ret i32 %Z
}
define i32 @feedback_loop(i1 %PredEntry, i1 %PredLeft, i1 %PredRight, i32 %X, i32 %Y) {
; CHECK-LABEL: @feedback_loop(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[IRR_GUARD:%.*]]
; CHECK: left:
; CHECK-NEXT: br i1 [[PREDLEFT:%.*]], label [[IRR_GUARD]], label [[EXIT:%.*]]
; CHECK: right:
; CHECK-NEXT: br i1 [[PREDRIGHT:%.*]], label [[IRR_GUARD]], label [[EXIT]]
; CHECK: exit:
; CHECK-NEXT: [[Z:%.*]] = phi i32 [ [[L_PHI_MOVED:%.*]], [[LEFT:%.*]] ], [ [[R_PHI_MOVED:%.*]], [[RIGHT:%.*]] ]
; CHECK-NEXT: ret i32 [[Z]]
; CHECK: irr.guard:
; CHECK-NEXT: [[GUARD_LEFT:%.*]] = phi i1 [ true, [[RIGHT]] ], [ [[PREDENTRY:%.*]], [[ENTRY:%.*]] ], [ false, [[LEFT]] ]
; CHECK-NEXT: [[L_PHI_MOVED]] = phi i32 [ [[R_PHI_MOVED]], [[RIGHT]] ], [ [[X:%.*]], [[ENTRY]] ], [ [[L_PHI_MOVED]], [[LEFT]] ]
; CHECK-NEXT: [[R_PHI_MOVED]] = phi i32 [ [[R_PHI_MOVED]], [[RIGHT]] ], [ [[Y:%.*]], [[ENTRY]] ], [ [[L_PHI_MOVED]], [[LEFT]] ]
; CHECK-NEXT: br i1 [[GUARD_LEFT]], label [[LEFT]], label [[RIGHT]]
;
entry:
br i1 %PredEntry, label %left, label %right
left:
%L.phi = phi i32 [%X, %entry], [%R.phi, %right]
br i1 %PredLeft, label %right, label %exit
right:
%R.phi = phi i32 [%Y, %entry], [%L.phi, %left]
br i1 %PredRight, label %left, label %exit
exit:
%Z = phi i32 [%L.phi, %left], [%R.phi, %right]
ret i32 %Z
}
define i32 @multiple_predecessors(i1 %PredEntry, i1 %PredA, i1 %PredB, i1 %PredC, i1 %PredD, i32 %X, i32 %Y) {
; CHECK-LABEL: @multiple_predecessors(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[PREDB_INV:%.*]] = xor i1 [[PREDB:%.*]], true
; CHECK-NEXT: br i1 [[PREDENTRY:%.*]], label [[A:%.*]], label [[B:%.*]]
; CHECK: A:
; CHECK-NEXT: [[A_INC:%.*]] = add i32 [[X:%.*]], 1
; CHECK-NEXT: br label [[IRR_GUARD:%.*]]
; CHECK: B:
; CHECK-NEXT: br label [[IRR_GUARD]]
; CHECK: C:
; CHECK-NEXT: br i1 [[PREDC:%.*]], label [[IRR_GUARD]], label [[EXIT:%.*]]
; CHECK: D:
; CHECK-NEXT: [[D_INC:%.*]] = add i32 [[D_PHI_MOVED:%.*]], 1
; CHECK-NEXT: br i1 [[PREDD:%.*]], label [[EXIT]], label [[IRR_GUARD]]
; CHECK: exit:
; CHECK-NEXT: [[RET:%.*]] = phi i32 [ [[C_PHI_MOVED:%.*]], [[C:%.*]] ], [ [[D_INC]], [[D:%.*]] ]
; CHECK-NEXT: ret i32 [[RET]]
; CHECK: irr.guard:
; CHECK-NEXT: [[GUARD_C:%.*]] = phi i1 [ true, [[D]] ], [ [[PREDB_INV]], [[B]] ], [ [[PREDA:%.*]], [[A]] ], [ false, [[C]] ]
; CHECK-NEXT: [[C_PHI_MOVED]] = phi i32 [ [[D_INC]], [[D]] ], [ [[Y:%.*]], [[B]] ], [ [[X]], [[A]] ], [ [[C_PHI_MOVED]], [[C]] ]
; CHECK-NEXT: [[D_PHI_MOVED]] = phi i32 [ [[D_PHI_MOVED]], [[D]] ], [ [[Y]], [[B]] ], [ [[A_INC]], [[A]] ], [ [[C_PHI_MOVED]], [[C]] ]
; CHECK-NEXT: br i1 [[GUARD_C]], label [[C]], label [[D]]
;
entry:
br i1 %PredEntry, label %A, label %B
A:
%A.inc = add i32 %X, 1
br i1 %PredA, label %C, label %D
B:
br i1 %PredB, label %D, label %C
C:
%C.phi = phi i32 [%X, %A], [%Y, %B], [%D.inc, %D]
br i1 %PredC, label %D, label %exit
D:
%D.phi = phi i32 [%A.inc, %A], [%Y, %B], [%C.phi, %C]
%D.inc = add i32 %D.phi, 1
br i1 %PredD, label %exit, label %C
exit:
%ret = phi i32 [%C.phi, %C], [%D.inc, %D]
ret i32 %ret
}
define i32 @separate_predecessors(i1 %PredEntry, i1 %PredA, i1 %PredB, i1 %PredC, i1 %PredD, i32 %X, i32 %Y) {
; CHECK-LABEL: @separate_predecessors(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[PREDENTRY:%.*]], label [[A:%.*]], label [[B:%.*]]
; CHECK: A:
; CHECK-NEXT: [[A_INC:%.*]] = add i32 [[X:%.*]], 1
; CHECK-NEXT: br label [[IRR_GUARD:%.*]]
; CHECK: B:
; CHECK-NEXT: br label [[IRR_GUARD]]
; CHECK: C:
; CHECK-NEXT: br i1 [[PREDC:%.*]], label [[EXIT:%.*]], label [[IRR_GUARD]]
; CHECK: D:
; CHECK-NEXT: [[D_INC:%.*]] = add i32 [[D_PHI_MOVED:%.*]], 1
; CHECK-NEXT: br i1 [[PREDD:%.*]], label [[EXIT]], label [[IRR_GUARD]]
; CHECK: exit:
; CHECK-NEXT: [[RET:%.*]] = phi i32 [ [[C_PHI_MOVED:%.*]], [[C:%.*]] ], [ [[D_INC]], [[D:%.*]] ]
; CHECK-NEXT: ret i32 [[RET]]
; CHECK: irr.guard:
; CHECK-NEXT: [[GUARD_C:%.*]] = phi i1 [ true, [[D]] ], [ true, [[A]] ], [ false, [[C]] ], [ false, [[B]] ]
; CHECK-NEXT: [[C_PHI_MOVED]] = phi i32 [ [[D_INC]], [[D]] ], [ [[X]], [[A]] ], [ [[C_PHI_MOVED]], [[C]] ], [ undef, [[B]] ]
; CHECK-NEXT: [[D_PHI_MOVED]] = phi i32 [ [[D_PHI_MOVED]], [[D]] ], [ undef, [[A]] ], [ [[C_PHI_MOVED]], [[C]] ], [ [[Y:%.*]], [[B]] ]
; CHECK-NEXT: br i1 [[GUARD_C]], label [[C]], label [[D]]
;
entry:
br i1 %PredEntry, label %A, label %B
A:
%A.inc = add i32 %X, 1
br label %C
B:
br label %D
C:
%C.phi = phi i32 [%X, %A], [%D.inc, %D]
br i1 %PredC, label %exit, label %D
D:
%D.phi = phi i32 [%Y, %B], [%C.phi, %C]
%D.inc = add i32 %D.phi, 1
br i1 %PredD, label %exit, label %C
exit:
%ret = phi i32 [%C.phi, %C], [%D.inc, %D]
ret i32 %ret
}
define void @four_headers(i1 %PredEntry, i1 %PredX, i1 %PredY, i1 %PredD) {
; CHECK-LABEL: @four_headers(
; CHECK-NEXT: entry:
; CHECK-NEXT: br i1 [[PREDENTRY:%.*]], label [[X:%.*]], label [[Y:%.*]]
; CHECK: X:
; CHECK-NEXT: br label [[IRR_GUARD:%.*]]
; CHECK: Y:
; CHECK-NEXT: br label [[IRR_GUARD]]
; CHECK: A:
; CHECK-NEXT: br label [[IRR_GUARD]]
; CHECK: B:
; CHECK-NEXT: br label [[IRR_GUARD]]
; CHECK: C:
; CHECK-NEXT: br label [[IRR_GUARD]]
; CHECK: D:
; CHECK-NEXT: br i1 [[PREDD:%.*]], label [[EXIT:%.*]], label [[IRR_GUARD]]
; CHECK: exit:
; CHECK-NEXT: ret void
; CHECK: irr.guard:
; CHECK-NEXT: [[GUARD_A:%.*]] = phi i1 [ true, [[D:%.*]] ], [ [[PREDX:%.*]], [[X]] ], [ false, [[A:%.*]] ], [ false, [[B:%.*]] ], [ false, [[Y]] ], [ false, [[C:%.*]] ]
; CHECK-NEXT: [[GUARD_B:%.*]] = phi i1 [ false, [[D]] ], [ true, [[X]] ], [ true, [[A]] ], [ false, [[B]] ], [ false, [[Y]] ], [ false, [[C]] ]
; CHECK-NEXT: [[GUARD_C:%.*]] = phi i1 [ false, [[D]] ], [ false, [[X]] ], [ false, [[A]] ], [ true, [[B]] ], [ [[PREDY:%.*]], [[Y]] ], [ false, [[C]] ]
; CHECK-NEXT: br i1 [[GUARD_A]], label [[A]], label [[IRR_GUARD1:%.*]]
; CHECK: irr.guard1:
; CHECK-NEXT: br i1 [[GUARD_B]], label [[B]], label [[IRR_GUARD2:%.*]]
; CHECK: irr.guard2:
; CHECK-NEXT: br i1 [[GUARD_C]], label [[C]], label [[D]]
;
entry:
br i1 %PredEntry, label %X, label %Y
X:
br i1 %PredX, label %A, label %B
Y:
br i1 %PredY, label %C, label %D
A:
br label %B
B:
br label %C
C:
br label %D
D:
br i1 %PredD, label %exit, label %A
exit:
ret void
}
define i32 @hidden_nodes(i1 %PredEntry, i1 %PredA, i1 %PredB, i1 %PredC, i1 %PredD, i32 %X, i32 %Y) {
; CHECK-LABEL: @hidden_nodes(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[IRR_GUARD:%.*]]
; CHECK: A:
; CHECK-NEXT: [[A_INC:%.*]] = add i32 [[A_PHI_MOVED:%.*]], 1
; CHECK-NEXT: br label [[IRR_GUARD]]
; CHECK: B:
; CHECK-NEXT: br label [[C:%.*]]
; CHECK: C:
; CHECK-NEXT: [[C_INC:%.*]] = add i32 [[B_PHI_MOVED:%.*]], 1
; CHECK-NEXT: br label [[D:%.*]]
; CHECK: D:
; CHECK-NEXT: br i1 [[PREDD:%.*]], label [[EXIT:%.*]], label [[E:%.*]]
; CHECK: E:
; CHECK-NEXT: br label [[IRR_GUARD]]
; CHECK: exit:
; CHECK-NEXT: ret i32 [[B_PHI_MOVED]]
; CHECK: irr.guard:
; CHECK-NEXT: [[GUARD_A:%.*]] = phi i1 [ true, [[E]] ], [ [[PREDENTRY:%.*]], [[ENTRY:%.*]] ], [ false, [[A:%.*]] ]
; CHECK-NEXT: [[A_PHI_MOVED]] = phi i32 [ [[C_INC]], [[E]] ], [ [[X:%.*]], [[ENTRY]] ], [ [[A_PHI_MOVED]], [[A]] ]
; CHECK-NEXT: [[B_PHI_MOVED]] = phi i32 [ undef, [[E]] ], [ [[Y:%.*]], [[ENTRY]] ], [ [[A_INC]], [[A]] ]
; CHECK-NEXT: br i1 [[GUARD_A]], label [[A]], label [[B:%.*]]
;
entry:
br i1 %PredEntry, label %A, label %B
A:
%A.phi = phi i32 [%X, %entry], [%C.inc, %E]
%A.inc = add i32 %A.phi, 1
br label %B
B:
%B.phi = phi i32 [%A.inc, %A], [%Y, %entry]
br label %C
C:
%C.inc = add i32 %B.phi, 1
br label %D
D:
br i1 %PredD, label %exit, label %E
E:
br label %A
exit:
ret i32 %B.phi
}