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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
78 lines
2.5 KiB
LLVM
78 lines
2.5 KiB
LLVM
; RUN: llc < %s -mtriple=thumbv8 -arm-atomic-cfg-tidy=0 | FileCheck %s
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; RUN: llc < %s -mtriple=thumbv7 -arm-atomic-cfg-tidy=0 -arm-restrict-it | FileCheck %s
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; RUN: llc < %s -mtriple=thumbv8 -arm-atomic-cfg-tidy=0 -relocation-model=pic | FileCheck %s --check-prefix=CHECK-PIC
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; RUN: llc < %s -mtriple=thumbv7 -arm-atomic-cfg-tidy=0 -arm-restrict-it -relocation-model=pic | FileCheck %s --check-prefix=CHECK-PIC
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%struct.FF = type { i32 (i32*)*, i32 (i32*, i32*, i32, i32, i32, i32)*, i32 (i32, i32, i8*)*, void ()*, i32 (i32, i8*, i32*)*, i32 ()* }
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%struct.BD = type { %struct.BD*, i32, i32, i32, i32, i64, i32 (%struct.BD*, i8*, i64, i32)*, i32 (%struct.BD*, i8*, i32, i32)*, i32 (%struct.BD*, i8*, i64, i32)*, i32 (%struct.BD*, i8*, i32, i32)*, i32 (%struct.BD*, i64, i32)*, [16 x i8], i64, i64 }
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@FuncPtr = external hidden unnamed_addr global %struct.FF*
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@.str1 = external hidden unnamed_addr constant [6 x i8], align 4
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@G = external unnamed_addr global i32
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@.str2 = external hidden unnamed_addr constant [58 x i8], align 4
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@.str3 = external hidden unnamed_addr constant [58 x i8], align 4
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define i32 @test() nounwind optsize ssp {
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entry:
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; CHECK-LABEL: test:
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; CHECK: push
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; CHECK-NOT: push
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%block_size = alloca i32, align 4
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%block_count = alloca i32, align 4
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%index_cache = alloca i32, align 4
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store i32 0, i32* %index_cache, align 4
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%tmp = load i32* @G, align 4
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%tmp1 = call i32 @bar(i32 0, i32 0, i32 %tmp) nounwind
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switch i32 %tmp1, label %bb8 [
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i32 0, label %bb
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i32 536870913, label %bb4
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i32 536870914, label %bb6
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]
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bb:
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%tmp2 = load i32* @G, align 4
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%tmp4 = icmp eq i32 %tmp2, 0
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br i1 %tmp4, label %bb1, label %bb8
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bb1:
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; CHECK: %bb6
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; CHECK: it eq
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; CHECK-NEXT: ldreq
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; CHECK-NEXT: it eq
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; CHECK-NEXT: cmpeq
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; CHECK: %bb1
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%tmp5 = load i32* %block_size, align 4
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%tmp6 = load i32* %block_count, align 4
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%tmp7 = call %struct.FF* @Get() nounwind
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store %struct.FF* %tmp7, %struct.FF** @FuncPtr, align 4
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%tmp10 = zext i32 %tmp6 to i64
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%tmp11 = zext i32 %tmp5 to i64
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%tmp12 = mul nsw i64 %tmp10, %tmp11
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%tmp13 = call i32 @foo(i8* getelementptr inbounds ([6 x i8]* @.str1, i32 0, i32 0), i64 %tmp12, i32 %tmp5) nounwind
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br label %bb8
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bb4:
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; CHECK-PIC: cmp
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; CHECK-PIC: cmp
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; CHECK-PIC-NEXT: bne
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; CHECK-PIC-NEXT: %bb4
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; CHECK-PIC-NEXT: movs
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; CHECK-PIC-NEXT: add
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; CHECK-PIC-NEXT: pop
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ret i32 0
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bb6:
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ret i32 1
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bb8:
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ret i32 -1
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}
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declare i32 @printf(i8*, ...)
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declare %struct.FF* @Get()
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declare i32 @foo(i8*, i64, i32)
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declare i32 @bar(i32, i32, i32)
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