mirror of
https://github.com/c64scene-ar/llvm-6502.git
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148e8c9b8b
IRCE eliminates range checks of the form
0 <= A * I + B < Length
by splitting a loop's iteration space into three segments in a way
that the check is completely redundant in the middle segment. As an
example, IRCE will convert
len = < known positive >
for (i = 0; i < n; i++) {
if (0 <= i && i < len) {
do_something();
} else {
throw_out_of_bounds();
}
}
to
len = < known positive >
limit = smin(n, len)
// no first segment
for (i = 0; i < limit; i++) {
if (0 <= i && i < len) { // this check is fully redundant
do_something();
} else {
throw_out_of_bounds();
}
}
for (i = limit; i < n; i++) {
if (0 <= i && i < len) {
do_something();
} else {
throw_out_of_bounds();
}
}
IRCE can deal with multiple range checks in the same loop (it takes
the intersection of the ranges that will make each of them redundant
individually).
Currently IRCE does not do any profitability analysis. That is a
TODO.
Please note that the status of this pass is *experimental*, and it is
not part of any default pass pipeline. Having said that, I will love
to get feedback and general input from people interested in trying
this out.
This pass was originally r226201. It was reverted because it used C++
features not supported by MSVC 2012.
Differential Revision: http://reviews.llvm.org/D6693
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226238 91177308-0d34-0410-b5e6-96231b3b80d8
345 lines
14 KiB
LLVM
345 lines
14 KiB
LLVM
; RUN: opt -verify-loop-info -irce-print-changed-loops -irce < %s 2>&1 | FileCheck %s
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; This test checks if we update the LoopInfo correctly in the presence
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; of parents, uncles and cousins.
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; Function Attrs: alwaysinline
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define void @inner_loop(i32* %arr, i32* %a_len_ptr, i32 %n) #0 {
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; CHECK: irce: in function inner_loop: constrained Loop at depth 1 containing: %loop<header><exiting>,%in.bounds<latch><exiting>
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entry:
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%len = load i32* %a_len_ptr, !range !0
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%first.itr.check = icmp sgt i32 %n, 0
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br i1 %first.itr.check, label %loop, label %exit
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loop: ; preds = %in.bounds, %entry
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%idx = phi i32 [ 0, %entry ], [ %idx.next, %in.bounds ]
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%idx.next = add i32 %idx, 1
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%abc = icmp slt i32 %idx, %len
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br i1 %abc, label %in.bounds, label %out.of.bounds
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in.bounds: ; preds = %loop
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%addr = getelementptr i32* %arr, i32 %idx
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store i32 0, i32* %addr
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%next = icmp slt i32 %idx.next, %n
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br i1 %next, label %loop, label %exit
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out.of.bounds: ; preds = %loop
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ret void
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exit: ; preds = %in.bounds, %entry
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ret void
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}
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; Function Attrs: alwaysinline
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define void @with_parent(i32* %arr, i32* %a_len_ptr, i32 %n, i32 %parent.count) #0 {
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; CHECK: irce: in function with_parent: constrained Loop at depth 2 containing: %loop.i<header><exiting>,%in.bounds.i<latch><exiting>
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entry:
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br label %loop
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loop: ; preds = %inner_loop.exit, %entry
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%idx = phi i32 [ 0, %entry ], [ %idx.next, %inner_loop.exit ]
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%idx.next = add i32 %idx, 1
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%next = icmp ult i32 %idx.next, %parent.count
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%len.i = load i32* %a_len_ptr, !range !0
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%first.itr.check.i = icmp sgt i32 %n, 0
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br i1 %first.itr.check.i, label %loop.i, label %exit.i
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loop.i: ; preds = %in.bounds.i, %loop
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%idx.i = phi i32 [ 0, %loop ], [ %idx.next.i, %in.bounds.i ]
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%idx.next.i = add i32 %idx.i, 1
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%abc.i = icmp slt i32 %idx.i, %len.i
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br i1 %abc.i, label %in.bounds.i, label %out.of.bounds.i
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in.bounds.i: ; preds = %loop.i
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%addr.i = getelementptr i32* %arr, i32 %idx.i
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store i32 0, i32* %addr.i
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%next.i = icmp slt i32 %idx.next.i, %n
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br i1 %next.i, label %loop.i, label %exit.i
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out.of.bounds.i: ; preds = %loop.i
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br label %inner_loop.exit
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exit.i: ; preds = %in.bounds.i, %loop
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br label %inner_loop.exit
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inner_loop.exit: ; preds = %exit.i, %out.of.bounds.i
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br i1 %next, label %loop, label %exit
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exit: ; preds = %inner_loop.exit
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ret void
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}
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; Function Attrs: alwaysinline
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define void @with_grandparent(i32* %arr, i32* %a_len_ptr, i32 %n, i32 %parent.count, i32 %grandparent.count) #0 {
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; CHECK: irce: in function with_grandparent: constrained Loop at depth 3 containing: %loop.i.i<header><exiting>,%in.bounds.i.i<latch><exiting>
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entry:
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br label %loop
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loop: ; preds = %with_parent.exit, %entry
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%idx = phi i32 [ 0, %entry ], [ %idx.next, %with_parent.exit ]
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%idx.next = add i32 %idx, 1
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%next = icmp ult i32 %idx.next, %grandparent.count
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br label %loop.i
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loop.i: ; preds = %inner_loop.exit.i, %loop
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%idx.i = phi i32 [ 0, %loop ], [ %idx.next.i, %inner_loop.exit.i ]
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%idx.next.i = add i32 %idx.i, 1
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%next.i = icmp ult i32 %idx.next.i, %parent.count
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%len.i.i = load i32* %a_len_ptr, !range !0
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%first.itr.check.i.i = icmp sgt i32 %n, 0
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br i1 %first.itr.check.i.i, label %loop.i.i, label %exit.i.i
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loop.i.i: ; preds = %in.bounds.i.i, %loop.i
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%idx.i.i = phi i32 [ 0, %loop.i ], [ %idx.next.i.i, %in.bounds.i.i ]
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%idx.next.i.i = add i32 %idx.i.i, 1
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%abc.i.i = icmp slt i32 %idx.i.i, %len.i.i
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br i1 %abc.i.i, label %in.bounds.i.i, label %out.of.bounds.i.i
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in.bounds.i.i: ; preds = %loop.i.i
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%addr.i.i = getelementptr i32* %arr, i32 %idx.i.i
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store i32 0, i32* %addr.i.i
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%next.i.i = icmp slt i32 %idx.next.i.i, %n
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br i1 %next.i.i, label %loop.i.i, label %exit.i.i
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out.of.bounds.i.i: ; preds = %loop.i.i
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br label %inner_loop.exit.i
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exit.i.i: ; preds = %in.bounds.i.i, %loop.i
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br label %inner_loop.exit.i
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inner_loop.exit.i: ; preds = %exit.i.i, %out.of.bounds.i.i
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br i1 %next.i, label %loop.i, label %with_parent.exit
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with_parent.exit: ; preds = %inner_loop.exit.i
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br i1 %next, label %loop, label %exit
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exit: ; preds = %with_parent.exit
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ret void
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}
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; Function Attrs: alwaysinline
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define void @with_sibling(i32* %arr, i32* %a_len_ptr, i32 %n, i32 %parent.count) #0 {
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; CHECK: irce: in function with_sibling: constrained Loop at depth 2 containing: %loop.i<header><exiting>,%in.bounds.i<latch><exiting>
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; CHECK: irce: in function with_sibling: constrained Loop at depth 2 containing: %loop.i6<header><exiting>,%in.bounds.i9<latch><exiting>
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entry:
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br label %loop
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loop: ; preds = %inner_loop.exit12, %entry
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%idx = phi i32 [ 0, %entry ], [ %idx.next, %inner_loop.exit12 ]
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%idx.next = add i32 %idx, 1
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%next = icmp ult i32 %idx.next, %parent.count
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%len.i = load i32* %a_len_ptr, !range !0
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%first.itr.check.i = icmp sgt i32 %n, 0
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br i1 %first.itr.check.i, label %loop.i, label %exit.i
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loop.i: ; preds = %in.bounds.i, %loop
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%idx.i = phi i32 [ 0, %loop ], [ %idx.next.i, %in.bounds.i ]
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%idx.next.i = add i32 %idx.i, 1
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%abc.i = icmp slt i32 %idx.i, %len.i
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br i1 %abc.i, label %in.bounds.i, label %out.of.bounds.i
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in.bounds.i: ; preds = %loop.i
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%addr.i = getelementptr i32* %arr, i32 %idx.i
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store i32 0, i32* %addr.i
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%next.i = icmp slt i32 %idx.next.i, %n
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br i1 %next.i, label %loop.i, label %exit.i
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out.of.bounds.i: ; preds = %loop.i
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br label %inner_loop.exit
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exit.i: ; preds = %in.bounds.i, %loop
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br label %inner_loop.exit
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inner_loop.exit: ; preds = %exit.i, %out.of.bounds.i
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%len.i1 = load i32* %a_len_ptr, !range !0
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%first.itr.check.i2 = icmp sgt i32 %n, 0
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br i1 %first.itr.check.i2, label %loop.i6, label %exit.i11
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loop.i6: ; preds = %in.bounds.i9, %inner_loop.exit
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%idx.i3 = phi i32 [ 0, %inner_loop.exit ], [ %idx.next.i4, %in.bounds.i9 ]
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%idx.next.i4 = add i32 %idx.i3, 1
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%abc.i5 = icmp slt i32 %idx.i3, %len.i1
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br i1 %abc.i5, label %in.bounds.i9, label %out.of.bounds.i10
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in.bounds.i9: ; preds = %loop.i6
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%addr.i7 = getelementptr i32* %arr, i32 %idx.i3
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store i32 0, i32* %addr.i7
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%next.i8 = icmp slt i32 %idx.next.i4, %n
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br i1 %next.i8, label %loop.i6, label %exit.i11
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out.of.bounds.i10: ; preds = %loop.i6
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br label %inner_loop.exit12
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exit.i11: ; preds = %in.bounds.i9, %inner_loop.exit
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br label %inner_loop.exit12
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inner_loop.exit12: ; preds = %exit.i11, %out.of.bounds.i10
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br i1 %next, label %loop, label %exit
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exit: ; preds = %inner_loop.exit12
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ret void
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}
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; Function Attrs: alwaysinline
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define void @with_cousin(i32* %arr, i32* %a_len_ptr, i32 %n, i32 %parent.count, i32 %grandparent.count) #0 {
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; CHECK: irce: in function with_cousin: constrained Loop at depth 3 containing: %loop.i.i<header><exiting>,%in.bounds.i.i<latch><exiting>
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; CHECK: irce: in function with_cousin: constrained Loop at depth 3 containing: %loop.i.i10<header><exiting>,%in.bounds.i.i13<latch><exiting>
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entry:
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br label %loop
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loop: ; preds = %with_parent.exit17, %entry
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%idx = phi i32 [ 0, %entry ], [ %idx.next, %with_parent.exit17 ]
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%idx.next = add i32 %idx, 1
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%next = icmp ult i32 %idx.next, %grandparent.count
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br label %loop.i
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loop.i: ; preds = %inner_loop.exit.i, %loop
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%idx.i = phi i32 [ 0, %loop ], [ %idx.next.i, %inner_loop.exit.i ]
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%idx.next.i = add i32 %idx.i, 1
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%next.i = icmp ult i32 %idx.next.i, %parent.count
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%len.i.i = load i32* %a_len_ptr, !range !0
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%first.itr.check.i.i = icmp sgt i32 %n, 0
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br i1 %first.itr.check.i.i, label %loop.i.i, label %exit.i.i
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loop.i.i: ; preds = %in.bounds.i.i, %loop.i
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%idx.i.i = phi i32 [ 0, %loop.i ], [ %idx.next.i.i, %in.bounds.i.i ]
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%idx.next.i.i = add i32 %idx.i.i, 1
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%abc.i.i = icmp slt i32 %idx.i.i, %len.i.i
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br i1 %abc.i.i, label %in.bounds.i.i, label %out.of.bounds.i.i
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in.bounds.i.i: ; preds = %loop.i.i
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%addr.i.i = getelementptr i32* %arr, i32 %idx.i.i
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store i32 0, i32* %addr.i.i
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%next.i.i = icmp slt i32 %idx.next.i.i, %n
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br i1 %next.i.i, label %loop.i.i, label %exit.i.i
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out.of.bounds.i.i: ; preds = %loop.i.i
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br label %inner_loop.exit.i
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exit.i.i: ; preds = %in.bounds.i.i, %loop.i
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br label %inner_loop.exit.i
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inner_loop.exit.i: ; preds = %exit.i.i, %out.of.bounds.i.i
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br i1 %next.i, label %loop.i, label %with_parent.exit
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with_parent.exit: ; preds = %inner_loop.exit.i
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br label %loop.i6
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loop.i6: ; preds = %inner_loop.exit.i16, %with_parent.exit
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%idx.i1 = phi i32 [ 0, %with_parent.exit ], [ %idx.next.i2, %inner_loop.exit.i16 ]
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%idx.next.i2 = add i32 %idx.i1, 1
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%next.i3 = icmp ult i32 %idx.next.i2, %parent.count
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%len.i.i4 = load i32* %a_len_ptr, !range !0
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%first.itr.check.i.i5 = icmp sgt i32 %n, 0
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br i1 %first.itr.check.i.i5, label %loop.i.i10, label %exit.i.i15
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loop.i.i10: ; preds = %in.bounds.i.i13, %loop.i6
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%idx.i.i7 = phi i32 [ 0, %loop.i6 ], [ %idx.next.i.i8, %in.bounds.i.i13 ]
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%idx.next.i.i8 = add i32 %idx.i.i7, 1
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%abc.i.i9 = icmp slt i32 %idx.i.i7, %len.i.i4
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br i1 %abc.i.i9, label %in.bounds.i.i13, label %out.of.bounds.i.i14
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in.bounds.i.i13: ; preds = %loop.i.i10
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%addr.i.i11 = getelementptr i32* %arr, i32 %idx.i.i7
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store i32 0, i32* %addr.i.i11
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%next.i.i12 = icmp slt i32 %idx.next.i.i8, %n
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br i1 %next.i.i12, label %loop.i.i10, label %exit.i.i15
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out.of.bounds.i.i14: ; preds = %loop.i.i10
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br label %inner_loop.exit.i16
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exit.i.i15: ; preds = %in.bounds.i.i13, %loop.i6
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br label %inner_loop.exit.i16
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inner_loop.exit.i16: ; preds = %exit.i.i15, %out.of.bounds.i.i14
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br i1 %next.i3, label %loop.i6, label %with_parent.exit17
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with_parent.exit17: ; preds = %inner_loop.exit.i16
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br i1 %next, label %loop, label %exit
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exit: ; preds = %with_parent.exit17
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ret void
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}
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; Function Attrs: alwaysinline
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define void @with_uncle(i32* %arr, i32* %a_len_ptr, i32 %n, i32 %parent.count, i32 %grandparent.count) #0 {
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; CHECK: irce: in function with_uncle: constrained Loop at depth 2 containing: %loop.i<header><exiting>,%in.bounds.i<latch><exiting>
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; CHECK: irce: in function with_uncle: constrained Loop at depth 3 containing: %loop.i.i<header><exiting>,%in.bounds.i.i<latch><exiting>
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entry:
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br label %loop
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loop: ; preds = %with_parent.exit, %entry
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%idx = phi i32 [ 0, %entry ], [ %idx.next, %with_parent.exit ]
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%idx.next = add i32 %idx, 1
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%next = icmp ult i32 %idx.next, %grandparent.count
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%len.i = load i32* %a_len_ptr, !range !0
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%first.itr.check.i = icmp sgt i32 %n, 0
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br i1 %first.itr.check.i, label %loop.i, label %exit.i
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loop.i: ; preds = %in.bounds.i, %loop
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%idx.i = phi i32 [ 0, %loop ], [ %idx.next.i, %in.bounds.i ]
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%idx.next.i = add i32 %idx.i, 1
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%abc.i = icmp slt i32 %idx.i, %len.i
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br i1 %abc.i, label %in.bounds.i, label %out.of.bounds.i
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in.bounds.i: ; preds = %loop.i
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%addr.i = getelementptr i32* %arr, i32 %idx.i
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store i32 0, i32* %addr.i
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%next.i = icmp slt i32 %idx.next.i, %n
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br i1 %next.i, label %loop.i, label %exit.i
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out.of.bounds.i: ; preds = %loop.i
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br label %inner_loop.exit
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exit.i: ; preds = %in.bounds.i, %loop
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br label %inner_loop.exit
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inner_loop.exit: ; preds = %exit.i, %out.of.bounds.i
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br label %loop.i4
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loop.i4: ; preds = %inner_loop.exit.i, %inner_loop.exit
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%idx.i1 = phi i32 [ 0, %inner_loop.exit ], [ %idx.next.i2, %inner_loop.exit.i ]
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%idx.next.i2 = add i32 %idx.i1, 1
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%next.i3 = icmp ult i32 %idx.next.i2, %parent.count
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%len.i.i = load i32* %a_len_ptr, !range !0
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%first.itr.check.i.i = icmp sgt i32 %n, 0
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br i1 %first.itr.check.i.i, label %loop.i.i, label %exit.i.i
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loop.i.i: ; preds = %in.bounds.i.i, %loop.i4
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%idx.i.i = phi i32 [ 0, %loop.i4 ], [ %idx.next.i.i, %in.bounds.i.i ]
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%idx.next.i.i = add i32 %idx.i.i, 1
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%abc.i.i = icmp slt i32 %idx.i.i, %len.i.i
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br i1 %abc.i.i, label %in.bounds.i.i, label %out.of.bounds.i.i
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in.bounds.i.i: ; preds = %loop.i.i
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%addr.i.i = getelementptr i32* %arr, i32 %idx.i.i
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store i32 0, i32* %addr.i.i
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%next.i.i = icmp slt i32 %idx.next.i.i, %n
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br i1 %next.i.i, label %loop.i.i, label %exit.i.i
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out.of.bounds.i.i: ; preds = %loop.i.i
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br label %inner_loop.exit.i
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exit.i.i: ; preds = %in.bounds.i.i, %loop.i4
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br label %inner_loop.exit.i
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inner_loop.exit.i: ; preds = %exit.i.i, %out.of.bounds.i.i
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br i1 %next.i3, label %loop.i4, label %with_parent.exit
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with_parent.exit: ; preds = %inner_loop.exit.i
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br i1 %next, label %loop, label %exit
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exit: ; preds = %with_parent.exit
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ret void
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|
}
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attributes #0 = { alwaysinline }
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!0 = !{i32 0, i32 2147483647}
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