288 lines
12 KiB
LLVM
288 lines
12 KiB
LLVM
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; RUN: opt -verify-loop-info -irce-print-changed-loops -irce -S < %s 2>&1 | FileCheck %s
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; RUN: opt -verify-loop-info -irce-print-changed-loops -passes='require<branch-prob>,irce' -S < %s 2>&1 | FileCheck %s
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; CHECK-LABEL: irce: in function test_01: constrained Loop at depth 1 containing:
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; CHECK-LABEL: irce: in function test_02: constrained Loop at depth 1 containing:
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; CHECK-LABEL: irce: in function test_03: constrained Loop at depth 1 containing:
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; CHECK-LABEL: irce: in function test_04: constrained Loop at depth 1 containing:
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; CHECK-LABEL: irce: in function test_05: constrained Loop at depth 1 containing:
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; This test used to demonstrate a miscompile: the outer loop's IV iterates in
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; range of [2, 400) and the range check is done against value 331. Due to a bug
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; in range intersection IRCE manages to eliminate the range check without
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; inserting a postloop, which is incorrect. We treat the range of this test as
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; an unsigned range and are able to intersect ranges correctly and insert a
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; postloop.
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define void @test_01() {
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; CHECK-LABEL: test_01
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; CHECK-NOT: preloop
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; CHECK: range_check_block: ; preds = %inner_loop
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; CHECK-NEXT: %range_check = icmp slt i32 %iv, 331
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; CHECK-NEXT: br i1 true, label %loop_latch
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; CHECK: loop_latch:
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; CHECK-NEXT: %iv_next = add i32 %iv, 1
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; CHECK-NEXT: %loop_cond = icmp ult i32 %iv_next, 400
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; CHECK-NEXT: [[COND:%[^ ]+]] = icmp ult i32 %iv_next, 331
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; CHECK-NEXT: br i1 [[COND]], label %loop_header, label %main.exit.selector
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; CHECK: main.exit.selector: ; preds = %loop_latch
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; CHECK-NEXT: %iv_next.lcssa = phi i32 [ %iv_next, %loop_latch ]
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; CHECK-NEXT: %iv.lcssa = phi i32 [ %iv, %loop_latch ]
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; CHECK-NEXT: [[MES_COND:%[^ ]+]] = icmp ult i32 %iv_next.lcssa, 400
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; CHECK-NEXT: br i1 [[MES_COND]], label %main.pseudo.exit, label %exit
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; CHECK: loop_latch.postloop: ; preds = %range_check_block.postloop
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; CHECK-NEXT: %iv_next.postloop = add i32 %iv.postloop, 1
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; CHECK-NEXT: %loop_cond.postloop = icmp ult i32 %iv_next.postloop, 400
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; CHECK-NEXT: br i1 %loop_cond.postloop, label %loop_header.postloop, label %exit.loopexit
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entry:
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br label %loop_header
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loop_header: ; preds = %loop_latch, %entry
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%iv = phi i32 [ 2, %entry ], [ %iv_next, %loop_latch ]
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%iv.prev = phi i32 [ 1, %entry ], [ %iv, %loop_latch ]
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%tmp2 = icmp sgt i32 %iv.prev, -1
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br i1 %tmp2, label %loop_header.split.us, label %exit
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loop_header.split.us: ; preds = %loop_header
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br label %inner_loop
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inner_loop: ; preds = %inner_loop, %loop_header.split.us
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%inner_iv = phi i32 [ 1, %loop_header.split.us ], [ %inner_iv_next, %inner_loop ]
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%inner_iv_next = add nuw nsw i32 %inner_iv, 1
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%inner_cond = icmp ult i32 %inner_iv_next, 31
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br i1 %inner_cond, label %inner_loop, label %range_check_block
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exit: ; preds = %loop_latch, %loop_header
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ret void
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range_check_block: ; preds = %inner_loop
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%range_check = icmp slt i32 %iv, 331
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br i1 %range_check, label %loop_latch, label %deopt
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loop_latch: ; preds = %range_check_block
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%iv_next = add i32 %iv, 1
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%loop_cond = icmp ult i32 %iv_next, 400
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br i1 %loop_cond, label %loop_header, label %exit
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deopt: ; preds = %range_check_block
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ret void
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}
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; Similar to test_01, but here the range check is done against 450. No postloop
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; is required.
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define void @test_02() {
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; CHECK-LABEL: test_02
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; CHECK-NOT: preloop
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; CHECK-NOT: postloop
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; CHECK: range_check_block: ; preds = %inner_loop
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; CHECK-NEXT: %range_check = icmp slt i32 %iv, 450
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; CHECK-NEXT: br i1 true, label %loop_latch
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; CHECK: loop_latch: ; preds = %range_check_block
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; CHECK-NEXT: %iv_next = add i32 %iv, 1
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; CHECK-NEXT: %loop_cond = icmp ult i32 %iv_next, 400
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; CHECK-NEXT: br i1 %loop_cond, label %loop_header, label %exit
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entry:
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br label %loop_header
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loop_header: ; preds = %loop_latch, %entry
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%iv = phi i32 [ 2, %entry ], [ %iv_next, %loop_latch ]
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%iv.prev = phi i32 [ 1, %entry ], [ %iv, %loop_latch ]
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%tmp2 = icmp sgt i32 %iv.prev, -1
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br i1 %tmp2, label %loop_header.split.us, label %exit
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loop_header.split.us: ; preds = %loop_header
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br label %inner_loop
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inner_loop: ; preds = %inner_loop, %loop_header.split.us
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%inner_iv = phi i32 [ 1, %loop_header.split.us ], [ %inner_iv_next, %inner_loop ]
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%inner_iv_next = add nuw nsw i32 %inner_iv, 1
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%inner_cond = icmp ult i32 %inner_iv_next, 31
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br i1 %inner_cond, label %inner_loop, label %range_check_block
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exit: ; preds = %loop_latch, %loop_header
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ret void
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range_check_block: ; preds = %inner_loop
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%range_check = icmp slt i32 %iv, 450
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br i1 %range_check, label %loop_latch, label %deopt
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loop_latch: ; preds = %range_check_block
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%iv_next = add i32 %iv, 1
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%loop_cond = icmp ult i32 %iv_next, 400
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br i1 %loop_cond, label %loop_header, label %exit
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deopt: ; preds = %range_check_block
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ret void
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}
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; Range check is made against 0, so the safe iteration range is empty. IRCE
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; should not apply to the inner loop. The condition %tmp2 can be eliminated.
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define void @test_03() {
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; CHECK-LABEL: test_03
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; CHECK-NOT: preloop
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; CHECK-NOT: postloop
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; CHECK: %tmp2 = icmp sgt i32 %iv.prev, -1
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; CHECK-NEXT: br i1 true, label %loop_header.split.us, label %exit
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; CHECK: range_check_block:
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; CHECK-NEXT: %range_check = icmp slt i32 %iv, 0
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; CHECK-NEXT: br i1 %range_check, label %loop_latch, label %deopt
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entry:
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br label %loop_header
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loop_header: ; preds = %loop_latch, %entry
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%iv = phi i32 [ 2, %entry ], [ %iv_next, %loop_latch ]
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%iv.prev = phi i32 [ 1, %entry ], [ %iv, %loop_latch ]
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%tmp2 = icmp sgt i32 %iv.prev, -1
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br i1 %tmp2, label %loop_header.split.us, label %exit
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loop_header.split.us: ; preds = %loop_header
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br label %inner_loop
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inner_loop: ; preds = %inner_loop, %loop_header.split.us
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%inner_iv = phi i32 [ 1, %loop_header.split.us ], [ %inner_iv_next, %inner_loop ]
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%inner_iv_next = add nuw nsw i32 %inner_iv, 1
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%inner_cond = icmp ult i32 %inner_iv_next, 31
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br i1 %inner_cond, label %inner_loop, label %range_check_block
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exit: ; preds = %loop_latch, %loop_header
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ret void
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range_check_block: ; preds = %inner_loop
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%range_check = icmp slt i32 %iv, 0
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br i1 %range_check, label %loop_latch, label %deopt
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loop_latch: ; preds = %range_check_block
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%iv_next = add i32 %iv, 1
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%loop_cond = icmp ult i32 %iv_next, 400
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br i1 %loop_cond, label %loop_header, label %exit
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deopt: ; preds = %range_check_block
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ret void
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}
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; We can also properly eliminate range check against %n which is not always
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; known positive.
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define void @test_04(i32* %p) {
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; CHECK-LABEL: test_04
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; CHECK: entry
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; CHECK-NOT: preloop
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; CHECK: %tmp2 = icmp sgt i32 %iv.prev, -1
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; CHECK-NEXT: br i1 true, label %loop_header.split.us, label %exit
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; CHECK: range_check_block:
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; CHECK-NEXT: %range_check = icmp slt i32 %iv, %n
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; CHECK-NEXT: br i1 true, label %loop_latch, label %deopt
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; CHECK: postloop:
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entry:
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%n = load i32, i32* %p
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br label %loop_header
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loop_header: ; preds = %loop_latch, %entry
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%iv = phi i32 [ 2, %entry ], [ %iv_next, %loop_latch ]
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%iv.prev = phi i32 [ 1, %entry ], [ %iv, %loop_latch ]
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%tmp2 = icmp sgt i32 %iv.prev, -1
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br i1 %tmp2, label %loop_header.split.us, label %exit
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loop_header.split.us: ; preds = %loop_header
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br label %inner_loop
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inner_loop: ; preds = %inner_loop, %loop_header.split.us
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%inner_iv = phi i32 [ 1, %loop_header.split.us ], [ %inner_iv_next, %inner_loop ]
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%inner_iv_next = add nuw nsw i32 %inner_iv, 1
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%inner_cond = icmp ult i32 %inner_iv_next, 31
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br i1 %inner_cond, label %inner_loop, label %range_check_block
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exit: ; preds = %loop_latch, %loop_header
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ret void
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range_check_block: ; preds = %inner_loop
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%range_check = icmp slt i32 %iv, %n
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br i1 %range_check, label %loop_latch, label %deopt
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loop_latch: ; preds = %range_check_block
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%iv_next = add i32 %iv, 1
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%loop_cond = icmp ult i32 %iv_next, 400
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br i1 %loop_cond, label %loop_header, label %exit
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deopt: ; preds = %range_check_block
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ret void
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}
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; Same as test_04, but range guarantees that %n is positive. So we can safely
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; intersect ranges (with insertion of postloop).
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define void @test_05(i32* %p) {
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; CHECK-LABEL: test_05
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; CHECK-NOT: preloop
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; CHECK: entry:
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; CHECK-NEXT: %n = load i32, i32* %p, align 4, !range !
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; CHECK-NEXT: [[CMP_1:%[^ ]+]] = icmp ugt i32 %n, 2
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; CHECK-NEXT: %exit.mainloop.at = select i1 [[CMP_1]], i32 %n, i32 2
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; CHECK-NEXT: [[CMP_2:%[^ ]+]] = icmp ult i32 2, %exit.mainloop.at
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; CHECK-NEXT: br i1 [[CMP_2]], label %loop_header.preheader, label %main.pseudo.exit
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; CHECK: range_check_block: ; preds = %inner_loop
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; CHECK-NEXT: %range_check = icmp slt i32 %iv, %n
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; CHECK-NEXT: br i1 true, label %loop_latch, label %deopt.loopexit2
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; CHECK: loop_latch: ; preds = %range_check_block
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; CHECK-NEXT: %iv_next = add i32 %iv, 1
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; CHECK-NEXT: %loop_cond = icmp ult i32 %iv_next, 400
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; CHECK-NEXT: [[COND:%[^ ]+]] = icmp ult i32 %iv_next, %exit.mainloop.at
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; CHECK-NEXT: br i1 [[COND]], label %loop_header, label %main.exit.selector
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; CHECK: main.exit.selector: ; preds = %loop_latch
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; CHECK-NEXT: %iv_next.lcssa = phi i32 [ %iv_next, %loop_latch ]
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; CHECK-NEXT: %iv.lcssa = phi i32 [ %iv, %loop_latch ]
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; CHECK-NEXT: [[MES_COND:%[^ ]+]] = icmp ult i32 %iv_next.lcssa, 400
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; CHECK-NEXT: br i1 [[MES_COND]], label %main.pseudo.exit, label %exit
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; CHECK: loop_latch.postloop: ; preds = %range_check_block.postloop
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; CHECK-NEXT: %iv_next.postloop = add i32 %iv.postloop, 1
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; CHECK-NEXT: %loop_cond.postloop = icmp ult i32 %iv_next.postloop, 400
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; CHECK-NEXT: br i1 %loop_cond.postloop, label %loop_header.postloop, label %exit.loopexit
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entry:
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%n = load i32, i32* %p, !range !0
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br label %loop_header
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loop_header: ; preds = %loop_latch, %entry
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%iv = phi i32 [ 2, %entry ], [ %iv_next, %loop_latch ]
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%iv.prev = phi i32 [ 1, %entry ], [ %iv, %loop_latch ]
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%tmp2 = icmp sgt i32 %iv.prev, -1
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br i1 %tmp2, label %loop_header.split.us, label %exit
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loop_header.split.us: ; preds = %loop_header
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br label %inner_loop
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inner_loop: ; preds = %inner_loop, %loop_header.split.us
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%inner_iv = phi i32 [ 1, %loop_header.split.us ], [ %inner_iv_next, %inner_loop ]
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%inner_iv_next = add nuw nsw i32 %inner_iv, 1
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%inner_cond = icmp ult i32 %inner_iv_next, 31
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br i1 %inner_cond, label %inner_loop, label %range_check_block
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exit: ; preds = %loop_latch, %loop_header
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ret void
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range_check_block: ; preds = %inner_loop
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%range_check = icmp slt i32 %iv, %n
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br i1 %range_check, label %loop_latch, label %deopt
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loop_latch: ; preds = %range_check_block
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%iv_next = add i32 %iv, 1
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%loop_cond = icmp ult i32 %iv_next, 400
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br i1 %loop_cond, label %loop_header, label %exit
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deopt: ; preds = %range_check_block
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ret void
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}
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!0 = !{i32 0, i32 50}
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