forked from OSchip/llvm-project
287 lines
12 KiB
LLVM
287 lines
12 KiB
LLVM
; RUN: opt -verify-loop-info -irce-print-changed-loops -irce -S < %s 2>&1 | FileCheck %s
|
|
|
|
; CHECK-LABEL: irce: in function test_01: constrained Loop at depth 1 containing:
|
|
; CHECK-LABEL: irce: in function test_02: constrained Loop at depth 1 containing:
|
|
; CHECK-LABEL: irce: in function test_03: constrained Loop at depth 1 containing:
|
|
; CHECK-LABEL: irce: in function test_04: constrained Loop at depth 1 containing:
|
|
; CHECK-LABEL: irce: in function test_05: constrained Loop at depth 1 containing:
|
|
|
|
; This test used to demonstrate a miscompile: the outer loop's IV iterates in
|
|
; range of [2, 400) and the range check is done against value 331. Due to a bug
|
|
; in range intersection IRCE manages to eliminate the range check without
|
|
; inserting a postloop, which is incorrect. We treat the range of this test as
|
|
; an unsigned range and are able to intersect ranges correctly and insert a
|
|
; postloop.
|
|
|
|
define void @test_01() {
|
|
|
|
; CHECK-LABEL: test_01
|
|
; CHECK-NOT: preloop
|
|
; CHECK: range_check_block: ; preds = %inner_loop
|
|
; CHECK-NEXT: %range_check = icmp slt i32 %iv, 331
|
|
; CHECK-NEXT: br i1 true, label %loop_latch
|
|
; CHECK: loop_latch:
|
|
; CHECK-NEXT: %iv_next = add i32 %iv, 1
|
|
; CHECK-NEXT: %loop_cond = icmp ult i32 %iv_next, 400
|
|
; CHECK-NEXT: [[COND:%[^ ]+]] = icmp ult i32 %iv_next, 331
|
|
; CHECK-NEXT: br i1 [[COND]], label %loop_header, label %main.exit.selector
|
|
; CHECK: main.exit.selector: ; preds = %loop_latch
|
|
; CHECK-NEXT: %iv_next.lcssa = phi i32 [ %iv_next, %loop_latch ]
|
|
; CHECK-NEXT: %iv.lcssa = phi i32 [ %iv, %loop_latch ]
|
|
; CHECK-NEXT: [[MES_COND:%[^ ]+]] = icmp ult i32 %iv_next.lcssa, 400
|
|
; CHECK-NEXT: br i1 [[MES_COND]], label %main.pseudo.exit, label %exit
|
|
; CHECK: loop_latch.postloop: ; preds = %range_check_block.postloop
|
|
; CHECK-NEXT: %iv_next.postloop = add i32 %iv.postloop, 1
|
|
; CHECK-NEXT: %loop_cond.postloop = icmp ult i32 %iv_next.postloop, 400
|
|
; CHECK-NEXT: br i1 %loop_cond.postloop, label %loop_header.postloop, label %exit.loopexit
|
|
|
|
entry:
|
|
br label %loop_header
|
|
|
|
loop_header: ; preds = %loop_latch, %entry
|
|
%iv = phi i32 [ 2, %entry ], [ %iv_next, %loop_latch ]
|
|
%iv.prev = phi i32 [ 1, %entry ], [ %iv, %loop_latch ]
|
|
%tmp2 = icmp sgt i32 %iv.prev, -1
|
|
br i1 %tmp2, label %loop_header.split.us, label %exit
|
|
|
|
loop_header.split.us: ; preds = %loop_header
|
|
br label %inner_loop
|
|
|
|
inner_loop: ; preds = %inner_loop, %loop_header.split.us
|
|
%inner_iv = phi i32 [ 1, %loop_header.split.us ], [ %inner_iv_next, %inner_loop ]
|
|
%inner_iv_next = add nuw nsw i32 %inner_iv, 1
|
|
%inner_cond = icmp ult i32 %inner_iv_next, 31
|
|
br i1 %inner_cond, label %inner_loop, label %range_check_block
|
|
|
|
exit: ; preds = %loop_latch, %loop_header
|
|
ret void
|
|
|
|
range_check_block: ; preds = %inner_loop
|
|
%range_check = icmp slt i32 %iv, 331
|
|
br i1 %range_check, label %loop_latch, label %deopt
|
|
|
|
loop_latch: ; preds = %range_check_block
|
|
%iv_next = add i32 %iv, 1
|
|
%loop_cond = icmp ult i32 %iv_next, 400
|
|
br i1 %loop_cond, label %loop_header, label %exit
|
|
|
|
deopt: ; preds = %range_check_block
|
|
ret void
|
|
}
|
|
|
|
; Similar to test_01, but here the range check is done against 450. No postloop
|
|
; is required.
|
|
|
|
define void @test_02() {
|
|
|
|
; CHECK-LABEL: test_02
|
|
; CHECK-NOT: preloop
|
|
; CHECK-NOT: postloop
|
|
; CHECK: range_check_block: ; preds = %inner_loop
|
|
; CHECK-NEXT: %range_check = icmp slt i32 %iv, 450
|
|
; CHECK-NEXT: br i1 true, label %loop_latch
|
|
; CHECK: loop_latch: ; preds = %range_check_block
|
|
; CHECK-NEXT: %iv_next = add i32 %iv, 1
|
|
; CHECK-NEXT: %loop_cond = icmp ult i32 %iv_next, 400
|
|
; CHECK-NEXT: br i1 %loop_cond, label %loop_header, label %exit
|
|
|
|
entry:
|
|
br label %loop_header
|
|
|
|
loop_header: ; preds = %loop_latch, %entry
|
|
%iv = phi i32 [ 2, %entry ], [ %iv_next, %loop_latch ]
|
|
%iv.prev = phi i32 [ 1, %entry ], [ %iv, %loop_latch ]
|
|
%tmp2 = icmp sgt i32 %iv.prev, -1
|
|
br i1 %tmp2, label %loop_header.split.us, label %exit
|
|
|
|
loop_header.split.us: ; preds = %loop_header
|
|
br label %inner_loop
|
|
|
|
inner_loop: ; preds = %inner_loop, %loop_header.split.us
|
|
%inner_iv = phi i32 [ 1, %loop_header.split.us ], [ %inner_iv_next, %inner_loop ]
|
|
%inner_iv_next = add nuw nsw i32 %inner_iv, 1
|
|
%inner_cond = icmp ult i32 %inner_iv_next, 31
|
|
br i1 %inner_cond, label %inner_loop, label %range_check_block
|
|
|
|
exit: ; preds = %loop_latch, %loop_header
|
|
ret void
|
|
|
|
range_check_block: ; preds = %inner_loop
|
|
%range_check = icmp slt i32 %iv, 450
|
|
br i1 %range_check, label %loop_latch, label %deopt
|
|
|
|
loop_latch: ; preds = %range_check_block
|
|
%iv_next = add i32 %iv, 1
|
|
%loop_cond = icmp ult i32 %iv_next, 400
|
|
br i1 %loop_cond, label %loop_header, label %exit
|
|
|
|
deopt: ; preds = %range_check_block
|
|
ret void
|
|
}
|
|
|
|
; Range check is made against 0, so the safe iteration range is empty. IRCE
|
|
; should not apply to the inner loop. The condition %tmp2 can be eliminated.
|
|
|
|
define void @test_03() {
|
|
|
|
; CHECK-LABEL: test_03
|
|
; CHECK-NOT: preloop
|
|
; CHECK-NOT: postloop
|
|
; CHECK: %tmp2 = icmp sgt i32 %iv.prev, -1
|
|
; CHECK-NEXT: br i1 true, label %loop_header.split.us, label %exit
|
|
; CHECK: range_check_block:
|
|
; CHECK-NEXT: %range_check = icmp slt i32 %iv, 0
|
|
; CHECK-NEXT: br i1 %range_check, label %loop_latch, label %deopt
|
|
|
|
entry:
|
|
br label %loop_header
|
|
|
|
loop_header: ; preds = %loop_latch, %entry
|
|
%iv = phi i32 [ 2, %entry ], [ %iv_next, %loop_latch ]
|
|
%iv.prev = phi i32 [ 1, %entry ], [ %iv, %loop_latch ]
|
|
%tmp2 = icmp sgt i32 %iv.prev, -1
|
|
br i1 %tmp2, label %loop_header.split.us, label %exit
|
|
|
|
loop_header.split.us: ; preds = %loop_header
|
|
br label %inner_loop
|
|
|
|
inner_loop: ; preds = %inner_loop, %loop_header.split.us
|
|
%inner_iv = phi i32 [ 1, %loop_header.split.us ], [ %inner_iv_next, %inner_loop ]
|
|
%inner_iv_next = add nuw nsw i32 %inner_iv, 1
|
|
%inner_cond = icmp ult i32 %inner_iv_next, 31
|
|
br i1 %inner_cond, label %inner_loop, label %range_check_block
|
|
|
|
exit: ; preds = %loop_latch, %loop_header
|
|
ret void
|
|
|
|
range_check_block: ; preds = %inner_loop
|
|
%range_check = icmp slt i32 %iv, 0
|
|
br i1 %range_check, label %loop_latch, label %deopt
|
|
|
|
loop_latch: ; preds = %range_check_block
|
|
%iv_next = add i32 %iv, 1
|
|
%loop_cond = icmp ult i32 %iv_next, 400
|
|
br i1 %loop_cond, label %loop_header, label %exit
|
|
|
|
deopt: ; preds = %range_check_block
|
|
ret void
|
|
}
|
|
|
|
; We do not know whether %n is positive or negative, so we prohibit IRCE in
|
|
; order to avoid incorrect intersection of signed and unsigned ranges.
|
|
; The condition %tmp2 can be eliminated.
|
|
|
|
define void @test_04(i32* %p) {
|
|
|
|
; CHECK-LABEL: test_04
|
|
; CHECK-NOT: preloop
|
|
; CHECK-NOT: postloop
|
|
; CHECK: %tmp2 = icmp sgt i32 %iv.prev, -1
|
|
; CHECK-NEXT: br i1 true, label %loop_header.split.us, label %exit
|
|
; CHECK: range_check_block:
|
|
; CHECK-NEXT: %range_check = icmp slt i32 %iv, %n
|
|
; CHECK-NEXT: br i1 %range_check, label %loop_latch, label %deopt
|
|
|
|
entry:
|
|
%n = load i32, i32* %p
|
|
br label %loop_header
|
|
|
|
loop_header: ; preds = %loop_latch, %entry
|
|
%iv = phi i32 [ 2, %entry ], [ %iv_next, %loop_latch ]
|
|
%iv.prev = phi i32 [ 1, %entry ], [ %iv, %loop_latch ]
|
|
%tmp2 = icmp sgt i32 %iv.prev, -1
|
|
br i1 %tmp2, label %loop_header.split.us, label %exit
|
|
|
|
loop_header.split.us: ; preds = %loop_header
|
|
br label %inner_loop
|
|
|
|
inner_loop: ; preds = %inner_loop, %loop_header.split.us
|
|
%inner_iv = phi i32 [ 1, %loop_header.split.us ], [ %inner_iv_next, %inner_loop ]
|
|
%inner_iv_next = add nuw nsw i32 %inner_iv, 1
|
|
%inner_cond = icmp ult i32 %inner_iv_next, 31
|
|
br i1 %inner_cond, label %inner_loop, label %range_check_block
|
|
|
|
exit: ; preds = %loop_latch, %loop_header
|
|
ret void
|
|
|
|
range_check_block: ; preds = %inner_loop
|
|
%range_check = icmp slt i32 %iv, %n
|
|
br i1 %range_check, label %loop_latch, label %deopt
|
|
|
|
loop_latch: ; preds = %range_check_block
|
|
%iv_next = add i32 %iv, 1
|
|
%loop_cond = icmp ult i32 %iv_next, 400
|
|
br i1 %loop_cond, label %loop_header, label %exit
|
|
|
|
deopt: ; preds = %range_check_block
|
|
ret void
|
|
}
|
|
|
|
; Same as test_04, but range guarantees that %n is positive. So we can safely
|
|
; intersect ranges (with insertion of postloop).
|
|
|
|
define void @test_05(i32* %p) {
|
|
|
|
; CHECK-LABEL: test_05
|
|
; CHECK-NOT: preloop
|
|
; CHECK: entry:
|
|
; CHECK-NEXT: %n = load i32, i32* %p, !range !6
|
|
; CHECK-NEXT: [[CMP_1:%[^ ]+]] = icmp ugt i32 %n, 2
|
|
; CHECK-NEXT: %exit.mainloop.at = select i1 [[CMP_1]], i32 %n, i32 2
|
|
; CHECK-NEXT: [[CMP_2:%[^ ]+]] = icmp ult i32 2, %exit.mainloop.at
|
|
; CHECK-NEXT: br i1 [[CMP_2]], label %loop_header.preheader, label %main.pseudo.exit
|
|
; CHECK: range_check_block: ; preds = %inner_loop
|
|
; CHECK-NEXT: %range_check = icmp slt i32 %iv, %n
|
|
; CHECK-NEXT: br i1 true, label %loop_latch, label %deopt.loopexit2
|
|
; CHECK: loop_latch: ; preds = %range_check_block
|
|
; CHECK-NEXT: %iv_next = add i32 %iv, 1
|
|
; CHECK-NEXT: %loop_cond = icmp ult i32 %iv_next, 400
|
|
; CHECK-NEXT: [[COND:%[^ ]+]] = icmp ult i32 %iv_next, %exit.mainloop.at
|
|
; CHECK-NEXT: br i1 [[COND]], label %loop_header, label %main.exit.selector
|
|
; CHECK: main.exit.selector: ; preds = %loop_latch
|
|
; CHECK-NEXT: %iv_next.lcssa = phi i32 [ %iv_next, %loop_latch ]
|
|
; CHECK-NEXT: %iv.lcssa = phi i32 [ %iv, %loop_latch ]
|
|
; CHECK-NEXT: [[MES_COND:%[^ ]+]] = icmp ult i32 %iv_next.lcssa, 400
|
|
; CHECK-NEXT: br i1 [[MES_COND]], label %main.pseudo.exit, label %exit
|
|
; CHECK: loop_latch.postloop: ; preds = %range_check_block.postloop
|
|
; CHECK-NEXT: %iv_next.postloop = add i32 %iv.postloop, 1
|
|
; CHECK-NEXT: %loop_cond.postloop = icmp ult i32 %iv_next.postloop, 400
|
|
; CHECK-NEXT: br i1 %loop_cond.postloop, label %loop_header.postloop, label %exit.loopexit
|
|
|
|
entry:
|
|
%n = load i32, i32* %p, !range !0
|
|
br label %loop_header
|
|
|
|
loop_header: ; preds = %loop_latch, %entry
|
|
%iv = phi i32 [ 2, %entry ], [ %iv_next, %loop_latch ]
|
|
%iv.prev = phi i32 [ 1, %entry ], [ %iv, %loop_latch ]
|
|
%tmp2 = icmp sgt i32 %iv.prev, -1
|
|
br i1 %tmp2, label %loop_header.split.us, label %exit
|
|
|
|
loop_header.split.us: ; preds = %loop_header
|
|
br label %inner_loop
|
|
|
|
inner_loop: ; preds = %inner_loop, %loop_header.split.us
|
|
%inner_iv = phi i32 [ 1, %loop_header.split.us ], [ %inner_iv_next, %inner_loop ]
|
|
%inner_iv_next = add nuw nsw i32 %inner_iv, 1
|
|
%inner_cond = icmp ult i32 %inner_iv_next, 31
|
|
br i1 %inner_cond, label %inner_loop, label %range_check_block
|
|
|
|
exit: ; preds = %loop_latch, %loop_header
|
|
ret void
|
|
|
|
range_check_block: ; preds = %inner_loop
|
|
%range_check = icmp slt i32 %iv, %n
|
|
br i1 %range_check, label %loop_latch, label %deopt
|
|
|
|
loop_latch: ; preds = %range_check_block
|
|
%iv_next = add i32 %iv, 1
|
|
%loop_cond = icmp ult i32 %iv_next, 400
|
|
br i1 %loop_cond, label %loop_header, label %exit
|
|
|
|
deopt: ; preds = %range_check_block
|
|
ret void
|
|
}
|
|
|
|
!0 = !{i32 0, i32 50}
|