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https://github.com/c64scene-ar/llvm-6502.git
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d0dbe02fd2
The C and C++ semantics for compare_exchange require it to return a bool
indicating success. This gets mapped to LLVM IR which follows each cmpxchg with
an icmp of the value loaded against the desired value.
When lowered to ldxr/stxr loops, this extra comparison is redundant: its
results are implicit in the control-flow of the function.
This commit makes two changes: it replaces that icmp with appropriate PHI
nodes, and then makes sure earlyCSE is called after expansion to actually make
use of the opportunities revealed.
I've also added -{arm,aarch64}-enable-atomic-tidy options, so that
existing fragile tests aren't perturbed too much by the change. Many
of them either rely on undef/unreachable too pervasively to be
restored to something well-defined (particularly while making sure
they test the same obscure assert from many years ago), or depend on a
particular CFG shape, which is disrupted by SimplifyCFG.
rdar://problem/16227836
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209883 91177308-0d34-0410-b5e6-96231b3b80d8
86 lines
3.4 KiB
LLVM
86 lines
3.4 KiB
LLVM
; RUN: llc < %s -mtriple=thumbv7-apple-darwin9 -mcpu=cortex-a8 -relocation-model=pic -disable-fp-elim -arm-atomic-cfg-tidy=0 | FileCheck %s
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@csize = external global [100 x [20 x [4 x i8]]] ; <[100 x [20 x [4 x i8]]]*> [#uses=1]
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@vsize = external global [100 x [20 x [4 x i8]]] ; <[100 x [20 x [4 x i8]]]*> [#uses=1]
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@cll = external global [20 x [10 x i8]] ; <[20 x [10 x i8]]*> [#uses=1]
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@lefline = external global [100 x [20 x i32]] ; <[100 x [20 x i32]]*> [#uses=1]
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@sep = external global [20 x i32] ; <[20 x i32]*> [#uses=1]
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define void @main(i32 %argc, i8** %argv) noreturn nounwind {
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; CHECK-LABEL: main:
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; CHECK: ldrb
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entry:
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%nb.i.i.i = alloca [25 x i8], align 1 ; <[25 x i8]*> [#uses=0]
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%line.i.i.i = alloca [200 x i8], align 1 ; <[200 x i8]*> [#uses=1]
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%line.i = alloca [1024 x i8], align 1 ; <[1024 x i8]*> [#uses=0]
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br i1 undef, label %bb.i.i, label %bb4.preheader.i
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bb.i.i: ; preds = %entry
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unreachable
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bb4.preheader.i: ; preds = %entry
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br i1 undef, label %tbl.exit, label %bb.i.preheader
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bb.i.preheader: ; preds = %bb4.preheader.i
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%line3.i.i.i = getelementptr [200 x i8]* %line.i.i.i, i32 0, i32 0 ; <i8*> [#uses=1]
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br label %bb.i
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bb.i: ; preds = %bb4.backedge.i, %bb.i.preheader
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br i1 undef, label %bb3.i, label %bb4.backedge.i
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bb3.i: ; preds = %bb.i
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br i1 undef, label %bb2.i184.i.i, label %bb.i183.i.i
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bb.i183.i.i: ; preds = %bb.i183.i.i, %bb3.i
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br i1 undef, label %bb2.i184.i.i, label %bb.i183.i.i
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bb2.i184.i.i: ; preds = %bb.i183.i.i, %bb3.i
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br i1 undef, label %bb5.i185.i.i, label %bb35.preheader.i.i.i
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bb35.preheader.i.i.i: ; preds = %bb2.i184.i.i
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%0 = load i8* %line3.i.i.i, align 1 ; <i8> [#uses=1]
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%1 = icmp eq i8 %0, 59 ; <i1> [#uses=1]
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br i1 %1, label %bb36.i.i.i, label %bb9.i186.i.i
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bb5.i185.i.i: ; preds = %bb2.i184.i.i
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br label %bb.i171.i.i
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bb9.i186.i.i: ; preds = %bb35.preheader.i.i.i
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unreachable
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bb36.i.i.i: ; preds = %bb35.preheader.i.i.i
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br label %bb.i171.i.i
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bb.i171.i.i: ; preds = %bb3.i176.i.i, %bb36.i.i.i, %bb5.i185.i.i
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%2 = phi i32 [ %4, %bb3.i176.i.i ], [ 0, %bb36.i.i.i ], [ 0, %bb5.i185.i.i ] ; <i32> [#uses=6]
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%scevgep16.i.i.i = getelementptr [20 x i32]* @sep, i32 0, i32 %2 ; <i32*> [#uses=1]
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%scevgep18.i.i.i = getelementptr [20 x [10 x i8]]* @cll, i32 0, i32 %2, i32 0 ; <i8*> [#uses=0]
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store i32 -1, i32* %scevgep16.i.i.i, align 4
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br label %bb1.i175.i.i
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bb1.i175.i.i: ; preds = %bb1.i175.i.i, %bb.i171.i.i
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%i.03.i172.i.i = phi i32 [ 0, %bb.i171.i.i ], [ %3, %bb1.i175.i.i ] ; <i32> [#uses=4]
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%scevgep11.i.i.i = getelementptr [100 x [20 x i32]]* @lefline, i32 0, i32 %i.03.i172.i.i, i32 %2 ; <i32*> [#uses=1]
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%scevgep12.i.i.i = getelementptr [100 x [20 x [4 x i8]]]* @vsize, i32 0, i32 %i.03.i172.i.i, i32 %2, i32 0 ; <i8*> [#uses=1]
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%scevgep13.i.i.i = getelementptr [100 x [20 x [4 x i8]]]* @csize, i32 0, i32 %i.03.i172.i.i, i32 %2, i32 0 ; <i8*> [#uses=0]
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store i8 0, i8* %scevgep12.i.i.i, align 1
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store i32 0, i32* %scevgep11.i.i.i, align 4
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store i32 108, i32* undef, align 4
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%3 = add i32 %i.03.i172.i.i, 1 ; <i32> [#uses=2]
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%exitcond.i174.i.i = icmp eq i32 %3, 100 ; <i1> [#uses=1]
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br i1 %exitcond.i174.i.i, label %bb3.i176.i.i, label %bb1.i175.i.i
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bb3.i176.i.i: ; preds = %bb1.i175.i.i
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%4 = add i32 %2, 1 ; <i32> [#uses=1]
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br i1 undef, label %bb5.i177.i.i, label %bb.i171.i.i
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bb5.i177.i.i: ; preds = %bb3.i176.i.i
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unreachable
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bb4.backedge.i: ; preds = %bb.i
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br i1 undef, label %tbl.exit, label %bb.i
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tbl.exit: ; preds = %bb4.backedge.i, %bb4.preheader.i
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unreachable
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}
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