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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
97 lines
2.8 KiB
LLVM
97 lines
2.8 KiB
LLVM
; RUN: llc < %s -mtriple=thumbv7-apple-ios -arm-atomic-cfg-tidy=0 | FileCheck %s
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; RUN: llc < %s -mtriple=thumbv7-apple-ios -arm-atomic-cfg-tidy=0 -arm-default-it | FileCheck %s
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; RUN: llc < %s -mtriple=thumbv8-apple-ios -arm-atomic-cfg-tidy=0 -arm-no-restrict-it | FileCheck %s
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define void @foo(i32 %X, i32 %Y) {
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entry:
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; CHECK-LABEL: foo:
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; CHECK: it ne
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; CHECK: cmpne
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; CHECK: it hi
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; CHECK: pophi {r7, pc}
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%tmp1 = icmp ult i32 %X, 4 ; <i1> [#uses=1]
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%tmp4 = icmp eq i32 %Y, 0 ; <i1> [#uses=1]
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%tmp7 = or i1 %tmp4, %tmp1 ; <i1> [#uses=1]
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br i1 %tmp7, label %cond_true, label %UnifiedReturnBlock
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cond_true: ; preds = %entry
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%tmp10 = call i32 (...)* @bar( ) ; <i32> [#uses=0]
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ret void
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UnifiedReturnBlock: ; preds = %entry
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ret void
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}
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declare i32 @bar(...)
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; FIXME: Need post-ifcvt branch folding to get rid of the extra br at end of BB1.
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%struct.quad_struct = type { i32, i32, %struct.quad_struct*, %struct.quad_struct*, %struct.quad_struct*, %struct.quad_struct*, %struct.quad_struct* }
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define fastcc i32 @CountTree(%struct.quad_struct* %tree) {
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entry:
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; CHECK-LABEL: CountTree:
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; CHECK: bne
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; CHECK: cmp
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; CHECK: it eq
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; CHECK: cmpeq
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; CHECK: itt eq
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; CHECK: moveq
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; CHECK: popeq
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br label %tailrecurse
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tailrecurse: ; preds = %bb, %entry
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%tmp6 = load %struct.quad_struct** null ; <%struct.quad_struct*> [#uses=1]
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%tmp9 = load %struct.quad_struct** null ; <%struct.quad_struct*> [#uses=2]
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%tmp12 = load %struct.quad_struct** null ; <%struct.quad_struct*> [#uses=1]
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%tmp14 = icmp eq %struct.quad_struct* null, null ; <i1> [#uses=1]
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%tmp17 = icmp eq %struct.quad_struct* %tmp6, null ; <i1> [#uses=1]
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%tmp23 = icmp eq %struct.quad_struct* %tmp9, null ; <i1> [#uses=1]
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%tmp29 = icmp eq %struct.quad_struct* %tmp12, null ; <i1> [#uses=1]
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%bothcond = and i1 %tmp17, %tmp14 ; <i1> [#uses=1]
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%bothcond1 = and i1 %bothcond, %tmp23 ; <i1> [#uses=1]
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%bothcond2 = and i1 %bothcond1, %tmp29 ; <i1> [#uses=1]
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br i1 %bothcond2, label %return, label %bb
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bb: ; preds = %tailrecurse
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%tmp41 = tail call fastcc i32 @CountTree( %struct.quad_struct* %tmp9 ) ; <i32> [#uses=0]
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br label %tailrecurse
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return: ; preds = %tailrecurse
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ret i32 0
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}
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%struct.SString = type { i8*, i32, i32 }
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declare void @abort()
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define fastcc void @t1(%struct.SString* %word, i8 signext %c) {
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entry:
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; CHECK-LABEL: t1:
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; CHECK: it ne
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; CHECK: popne {r7, pc}
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%tmp1 = icmp eq %struct.SString* %word, null ; <i1> [#uses=1]
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br i1 %tmp1, label %cond_true, label %cond_false
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cond_true: ; preds = %entry
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tail call void @abort( )
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unreachable
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cond_false: ; preds = %entry
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ret void
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}
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define fastcc void @t2() nounwind {
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entry:
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; CHECK-LABEL: t2:
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; CHECK: cmp r0, #0
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; CHECK: %growMapping.exit
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br i1 undef, label %bb.i.i3, label %growMapping.exit
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bb.i.i3: ; preds = %entry
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unreachable
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growMapping.exit: ; preds = %entry
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unreachable
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}
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