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[LoopPredication] Check whether the loop is already guarded by the first iteration check condition

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@315623 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Artur Pilipenko
2017-10-12 21:21:17 +00:00
parent 4d6b50c6a7
commit 2a079134ab
4 changed files with 77 additions and 37 deletions
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test/Transforms/LoopPredication/basic.ll
+64 -28
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@@ -11,8 +11,8 @@ entry:
loop.preheader:
; CHECK: loop.preheader:
; CHECK: [[first_iteration_check:[^ ]+]] = icmp ult i32 0, %length
; CHECK-NEXT: [[limit_check:[^ ]+]] = icmp ule i32 %n, %length
; CHECK: [[limit_check:[^ ]+]] = icmp ule i32 %n, %length
; CHECK-NEXT: [[first_iteration_check:[^ ]+]] = icmp ult i32 0, %length
; CHECK-NEXT: [[wide_cond:[^ ]+]] = and i1 [[first_iteration_check]], [[limit_check]]
; CHECK-NEXT: br label %loop
br label %loop
@@ -47,8 +47,8 @@ entry:
loop.preheader:
; CHECK: loop.preheader:
; CHECK: [[first_iteration_check:[^ ]+]] = icmp ult i32 0, %length
; CHECK-NEXT: [[limit_check:[^ ]+]] = icmp ult i32 %n, %length
; CHECK: [[limit_check:[^ ]+]] = icmp ult i32 %n, %length
; CHECK-NEXT: [[first_iteration_check:[^ ]+]] = icmp ult i32 0, %length
; CHECK-NEXT: [[wide_cond:[^ ]+]] = and i1 [[first_iteration_check]], [[limit_check]]
; CHECK-NEXT: br label %loop
br label %loop
@@ -83,8 +83,8 @@ entry:
loop.preheader:
; CHECK: loop.preheader:
; CHECK: [[first_iteration_check:[^ ]+]] = icmp ult i32 0, %length
; CHECK-NEXT: [[limit_check:[^ ]+]] = icmp ule i32 %n, %length
; CHECK: [[limit_check:[^ ]+]] = icmp ule i32 %n, %length
; CHECK-NEXT: [[first_iteration_check:[^ ]+]] = icmp ult i32 0, %length
; CHECK-NEXT: [[wide_cond:[^ ]+]] = and i1 [[first_iteration_check]], [[limit_check]]
; CHECK-NEXT: br label %loop
br label %loop
@@ -119,8 +119,8 @@ entry:
loop.preheader:
; CHECK: loop.preheader:
; CHECK: [[first_iteration_check:[^ ]+]] = icmp ult i32 0, %length
; CHECK-NEXT: [[limit_check:[^ ]+]] = icmp sle i32 %n, %length
; CHECK: [[limit_check:[^ ]+]] = icmp sle i32 %n, %length
; CHECK-NEXT: [[first_iteration_check:[^ ]+]] = icmp ult i32 0, %length
; CHECK-NEXT: [[wide_cond:[^ ]+]] = and i1 [[first_iteration_check]], [[limit_check]]
; CHECK-NEXT: br label %loop
br label %loop
@@ -147,6 +147,42 @@ exit:
ret i32 %result
}
define i32 @signed_loop_0_to_n_ult_check_length_range_known(i32* %array, i32* %length.ptr, i32 %n) {
; CHECK-LABEL: @signed_loop_0_to_n_ult_check_length_range_known
entry:
%tmp5 = icmp sle i32 %n, 0
%length = load i32, i32* %length.ptr, !range !{i32 1, i32 2147483648}
br i1 %tmp5, label %exit, label %loop.preheader
loop.preheader:
; CHECK: loop.preheader:
; CHECK: [[limit_check:[^ ]+]] = icmp sle i32 %n, %length
; CHECK-NEXT: [[wide_cond:[^ ]+]] = and i1 true, [[limit_check]]
; CHECK-NEXT: br label %loop
br label %loop
loop:
; CHECK: loop:
; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 [[wide_cond]], i32 9) [ "deopt"() ]
%loop.acc = phi i32 [ %loop.acc.next, %loop ], [ 0, %loop.preheader ]
%i = phi i32 [ %i.next, %loop ], [ 0, %loop.preheader ]
%within.bounds = icmp ult i32 %i, %length
call void (i1, ...) @llvm.experimental.guard(i1 %within.bounds, i32 9) [ "deopt"() ]
%i.i64 = zext i32 %i to i64
%array.i.ptr = getelementptr inbounds i32, i32* %array, i64 %i.i64
%array.i = load i32, i32* %array.i.ptr, align 4
%loop.acc.next = add i32 %loop.acc, %array.i
%i.next = add nuw i32 %i, 1
%continue = icmp slt i32 %i.next, %n
br i1 %continue, label %loop, label %exit
exit:
%result = phi i32 [ 0, %entry ], [ %loop.acc.next, %loop ]
ret i32 %result
}
define i32 @signed_loop_0_to_n_inverse_latch_predicate(i32* %array, i32 %length, i32 %n) {
; CHECK-LABEL: @signed_loop_0_to_n_inverse_latch_predicate
entry:
@@ -155,8 +191,8 @@ entry:
loop.preheader:
; CHECK: loop.preheader:
; CHECK: [[first_iteration_check:[^ ]+]] = icmp ult i32 0, %length
; CHECK-NEXT: [[limit_check:[^ ]+]] = icmp slt i32 %n, %length
; CHECK: [[limit_check:[^ ]+]] = icmp slt i32 %n, %length
; CHECK-NEXT: [[first_iteration_check:[^ ]+]] = icmp ult i32 0, %length
; CHECK-NEXT: [[wide_cond:[^ ]+]] = and i1 [[first_iteration_check]], [[limit_check]]
; CHECK-NEXT: br label %loop
br label %loop
@@ -191,8 +227,8 @@ entry:
loop.preheader:
; CHECK: loop.preheader:
; CHECK: [[first_iteration_check:[^ ]+]] = icmp ult i32 0, %length
; CHECK-NEXT: [[limit_check:[^ ]+]] = icmp slt i32 %n, %length
; CHECK: [[limit_check:[^ ]+]] = icmp slt i32 %n, %length
; CHECK-NEXT: [[first_iteration_check:[^ ]+]] = icmp ult i32 0, %length
; CHECK-NEXT: [[wide_cond:[^ ]+]] = and i1 [[first_iteration_check]], [[limit_check]]
; CHECK-NEXT: br label %loop
br label %loop
@@ -295,8 +331,8 @@ entry:
loop.preheader:
; CHECK: loop.preheader:
; CHECK: [[first_iteration_check:[^ ]+]] = icmp ult i32 0, %length
; CHECK-NEXT: [[limit_check:[^ ]+]] = icmp sle i32 %n, %length
; CHECK: [[limit_check:[^ ]+]] = icmp sle i32 %n, %length
; CHECK-NEXT: [[first_iteration_check:[^ ]+]] = icmp ult i32 0, %length
; CHECK-NEXT: [[wide_cond:[^ ]+]] = and i1 [[first_iteration_check]], [[limit_check]]
; CHECK-NEXT: br label %loop
br label %loop
@@ -372,11 +408,11 @@ entry:
loop.preheader:
; CHECK: loop.preheader:
; CHECK: [[first_iteration_check_1:[^ ]+]] = icmp ult i32 0, %length.{{1|2}}
; CHECK-NEXT: [[limit_check_1:[^ ]+]] = icmp ule i32 %n, %length.{{1|2}}
; CHECK: [[limit_check_1:[^ ]+]] = icmp ule i32 %n, %length.{{1|2}}
; CHECK-NEXT: [[first_iteration_check_1:[^ ]+]] = icmp ult i32 0, %length.{{1|2}}
; CHECK-NEXT: [[wide_cond_1:[^ ]+]] = and i1 [[first_iteration_check_1]], [[limit_check_1]]
; CHECK-NEXT: [[first_iteration_check_2:[^ ]+]] = icmp ult i32 0, %length.{{1|2}}
; CHECK-NEXT: [[limit_check_2:[^ ]+]] = icmp ule i32 %n, %length.{{1|2}}
; CHECK-NEXT: [[first_iteration_check_2:[^ ]+]] = icmp ult i32 0, %length.{{1|2}}
; CHECK-NEXT: [[wide_cond_2:[^ ]+]] = and i1 [[first_iteration_check_2]], [[limit_check_2]]
; CHECK-NEXT: br label %loop
br label %loop
@@ -420,14 +456,14 @@ entry:
loop.preheader:
; CHECK: loop.preheader:
; CHECK: [[first_iteration_check_1:[^ ]+]] = icmp ult i32 0, %length.{{1|2|3}}
; CHECK-NEXT: [[limit_check_1:[^ ]+]] = icmp ule i32 %n, %length.{{1|2|3}}
; CHECK: [[limit_check_1:[^ ]+]] = icmp ule i32 %n, %length.{{1|2|3}}
; CHECK-NEXT: [[first_iteration_check_1:[^ ]+]] = icmp ult i32 0, %length.{{1|2|3}}
; CHECK-NEXT: [[wide_cond_1:[^ ]+]] = and i1 [[first_iteration_check_1]], [[limit_check_1]]
; CHECK-NEXT: [[first_iteration_check_2:[^ ]+]] = icmp ult i32 0, %length.{{1|2|3}}
; CHECK-NEXT: [[limit_check_2:[^ ]+]] = icmp ule i32 %n, %length.{{1|2|3}}
; CHECK-NEXT: [[first_iteration_check_2:[^ ]+]] = icmp ult i32 0, %length.{{1|2|3}}
; CHECK-NEXT: [[wide_cond_2:[^ ]+]] = and i1 [[first_iteration_check_2]], [[limit_check_2]]
; CHECK-NEXT: [[first_iteration_check_3:[^ ]+]] = icmp ult i32 0, %length.{{1|2|3}}
; CHECK-NEXT: [[limit_check_3:[^ ]+]] = icmp ule i32 %n, %length.{{1|2|3}}
; CHECK-NEXT: [[first_iteration_check_3:[^ ]+]] = icmp ult i32 0, %length.{{1|2|3}}
; CHECK-NEXT: [[wide_cond_3:[^ ]+]] = and i1 [[first_iteration_check_3]], [[limit_check_3]]
; CHECK-NEXT: br label %loop
br label %loop
@@ -478,14 +514,14 @@ entry:
loop.preheader:
; CHECK: loop.preheader:
; CHECK: [[first_iteration_check_1:[^ ]+]] = icmp ult i32 0, %length.{{1|2|3}}
; CHECK-NEXT: [[limit_check_1:[^ ]+]] = icmp ule i32 %n, %length.{{1|2|3}}
; CHECK: [[limit_check_1:[^ ]+]] = icmp ule i32 %n, %length.{{1|2|3}}
; CHECK-NEXT: [[first_iteration_check_1:[^ ]+]] = icmp ult i32 0, %length.{{1|2|3}}
; CHECK-NEXT: [[wide_cond_1:[^ ]+]] = and i1 [[first_iteration_check_1]], [[limit_check_1]]
; CHECK-NEXT: [[first_iteration_check_2:[^ ]+]] = icmp ult i32 0, %length.{{1|2|3}}
; CHECK-NEXT: [[limit_check_2:[^ ]+]] = icmp ule i32 %n, %length.{{1|2|3}}
; CHECK-NEXT: [[first_iteration_check_2:[^ ]+]] = icmp ult i32 0, %length.{{1|2|3}}
; CHECK-NEXT: [[wide_cond_2:[^ ]+]] = and i1 [[first_iteration_check_2]], [[limit_check_2]]
; CHECK-NEXT: [[first_iteration_check_3:[^ ]+]] = icmp ult i32 0, %length.{{1|2|3}}
; CHECK-NEXT: [[limit_check_3:[^ ]+]] = icmp ule i32 %n, %length.{{1|2|3}}
; CHECK-NEXT: [[first_iteration_check_3:[^ ]+]] = icmp ult i32 0, %length.{{1|2|3}}
; CHECK-NEXT: [[wide_cond_3:[^ ]+]] = and i1 [[first_iteration_check_3]], [[limit_check_3]]
; CHECK-NEXT: br label %loop
br label %loop
@@ -538,8 +574,8 @@ entry:
loop.preheader:
; CHECK: loop.preheader:
; CHECK: [[first_iteration_check:[^ ]+]] = icmp ult i32 0, %length
; CHECK-NEXT: [[limit_check:[^ ]+]] = icmp ule i32 %n, %length
; CHECK: [[limit_check:[^ ]+]] = icmp ule i32 %n, %length
; CHECK-NEXT: [[first_iteration_check:[^ ]+]] = icmp ult i32 0, %length
; CHECK-NEXT: [[wide_cond:[^ ]+]] = and i1 [[first_iteration_check]], [[limit_check]]
; CHECK-NEXT: br label %loop
br label %loop
@@ -693,8 +729,8 @@ entry:
loop.preheader:
; CHECK: loop.preheader:
; CHECK: [[length:[^ ]+]] = zext i16 %length.i16 to i32
; CHECK-NEXT: [[first_iteration_check:[^ ]+]] = icmp ult i32 0, [[length]]
; CHECK-NEXT: [[limit_check:[^ ]+]] = icmp ule i32 %n, [[length]]
; CHECK-NEXT: [[first_iteration_check:[^ ]+]] = icmp ult i32 0, [[length]]
; CHECK-NEXT: [[wide_cond:[^ ]+]] = and i1 [[first_iteration_check]], [[limit_check]]
; CHECK-NEXT: br label %loop
br label %loop