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3bb84c9bcc
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
llvm-svn: 209883
129 lines
4.3 KiB
LLVM
129 lines
4.3 KiB
LLVM
; RUN: llc < %s -asm-verbose=false -O3 -mtriple=armv6-apple-darwin -relocation-model=pic -mcpu=arm1136jf-s -arm-atomic-cfg-tidy=0 | FileCheck %s
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; rdar://8959122 illegal register operands for UMULL instruction
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; in cfrac nightly test.
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; Armv6 generates a umull that must write to two distinct destination regs.
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; ModuleID = 'bugpoint-reduced-simplified.bc'
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target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:32:64-v128:32:128-a0:0:64-n32"
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target triple = "armv6-apple-darwin10"
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define void @ptoa(i1 %tst, i8* %p8, i8 %val8) nounwind {
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entry:
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br i1 false, label %bb3, label %bb
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bb: ; preds = %entry
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br label %bb3
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bb3: ; preds = %bb, %entry
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%0 = call noalias i8* @malloc() nounwind
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br i1 %tst, label %bb46, label %bb8
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bb8: ; preds = %bb3
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%1 = getelementptr inbounds i8* %0, i32 0
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store i8 0, i8* %1, align 1
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%2 = call i32 @ptou() nounwind
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; CHECK: umull [[REGISTER:lr|r[0-9]+]],
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; CHECK-NOT: [[REGISTER]],
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; CHECK: {{lr|r[0-9]+}}, {{lr|r[0-9]+$}}
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; CHECK: umull [[REGISTER:lr|r[0-9]+]],
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; CHECK-NOT: [[REGISTER]],
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; CHECK: {{lr|r[0-9]+}}, {{lr|r[0-9]+$}}
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%3 = udiv i32 %2, 10
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%4 = urem i32 %3, 10
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%5 = icmp ult i32 %4, 10
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%6 = trunc i32 %4 to i8
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%7 = or i8 %6, 48
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%8 = add i8 %6, 87
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%iftmp.5.0.1 = select i1 %5, i8 %7, i8 %8
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store i8 %iftmp.5.0.1, i8* %p8, align 1
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; CHECK: umull [[REGISTER:lr|r[0-9]+]],
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; CHECK-NOT: [[REGISTER]],
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; CHECK: {{lr|r[0-9]+}}, {{lr|r[0-9]+$}}
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; CHECK: umull [[REGISTER:lr|r[0-9]+]],
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; CHECK-NOT: [[REGISTER]],
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; CHECK: {{lr|r[0-9]+}}, {{lr|r[0-9]+$}}
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%9 = udiv i32 %2, 100
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%10 = urem i32 %9, 10
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%11 = icmp ult i32 %10, 10
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%12 = trunc i32 %10 to i8
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%13 = or i8 %12, 48
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%14 = add i8 %12, 87
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%iftmp.5.0.2 = select i1 %11, i8 %13, i8 %14
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store i8 %iftmp.5.0.2, i8* %p8, align 1
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; CHECK: umull [[REGISTER:lr|r[0-9]+]],
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; CHECK-NOT: [[REGISTER]],
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; CHECK: {{lr|r[0-9]+}}, {{lr|r[0-9]+$}}
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; CHECK: umull [[REGISTER:lr|r[0-9]+]],
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; CHECK-NOT: [[REGISTER]],
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; CHECK: {{lr|r[0-9]+}}, {{lr|r[0-9]+$}}
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%15 = udiv i32 %2, 10000
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%16 = urem i32 %15, 10
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%17 = icmp ult i32 %16, 10
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%18 = trunc i32 %16 to i8
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%19 = or i8 %18, 48
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%20 = add i8 %18, 87
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%iftmp.5.0.4 = select i1 %17, i8 %19, i8 %20
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store i8 %iftmp.5.0.4, i8* null, align 1
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; CHECK: umull [[REGISTER:lr|r[0-9]+]],
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; CHECK-NOT: [[REGISTER]],
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; CHECK: {{lr|r[0-9]+}}, {{lr|r[0-9]+$}}
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; CHECK: umull [[REGISTER:lr|r[0-9]+]],
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; CHECK-NOT: [[REGISTER]],
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; CHECK: {{lr|r[0-9]+}}, {{lr|r[0-9]+$}}
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%21 = udiv i32 %2, 100000
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%22 = urem i32 %21, 10
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%23 = icmp ult i32 %22, 10
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%iftmp.5.0.5 = select i1 %23, i8 0, i8 %val8
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store i8 %iftmp.5.0.5, i8* %p8, align 1
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; CHECK: umull [[REGISTER:lr|r[0-9]+]],
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; CHECK-NOT: [[REGISTER]],
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; CHECK: {{lr|r[0-9]+}}, {{lr|r[0-9]+$}}
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; CHECK: umull [[REGISTER:lr|r[0-9]+]],
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; CHECK-NOT: [[REGISTER]],
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; CHECK: {{lr|r[0-9]+}}, {{lr|r[0-9]+$}}
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%24 = udiv i32 %2, 1000000
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%25 = urem i32 %24, 10
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%26 = icmp ult i32 %25, 10
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%27 = trunc i32 %25 to i8
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%28 = or i8 %27, 48
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%29 = add i8 %27, 87
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%iftmp.5.0.6 = select i1 %26, i8 %28, i8 %29
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store i8 %iftmp.5.0.6, i8* %p8, align 1
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; CHECK: umull [[REGISTER:lr|r[0-9]+]],
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; CHECK-NOT: [[REGISTER]],
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; CHECK: {{lr|r[0-9]+}}, {{lr|r[0-9]+$}}
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; CHECK: umull [[REGISTER:lr|r[0-9]+]],
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; CHECK-NOT: [[REGISTER]],
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; CHECK: {{lr|r[0-9]+}}, {{lr|r[0-9]+$}}
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%30 = udiv i32 %2, 10000000
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%31 = urem i32 %30, 10
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%32 = icmp ult i32 %31, 10
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%33 = trunc i32 %31 to i8
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%34 = or i8 %33, 48
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%35 = add i8 %33, 87
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%iftmp.5.0.7 = select i1 %32, i8 %34, i8 %35
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store i8 %iftmp.5.0.7, i8* %p8, align 1
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; CHECK: umull [[REGISTER:lr|r[0-9]+]],
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; CHECK-NOT: [[REGISTER]],
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; CHECK: {{lr|r[0-9]+}}, {{lr|r[0-9]+$}}
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; CHECK: umull [[REGISTER:lr|r[0-9]+]],
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; CHECK-NOT: [[REGISTER]],
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; CHECK: {{lr|r[0-9]+}}, {{lr|r[0-9]+$}}
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%36 = udiv i32 %2, 100000000
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%37 = urem i32 %36, 10
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%38 = icmp ult i32 %37, 10
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%39 = trunc i32 %37 to i8
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%40 = or i8 %39, 48
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%41 = add i8 %39, 87
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%iftmp.5.0.8 = select i1 %38, i8 %40, i8 %41
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store i8 %iftmp.5.0.8, i8* null, align 1
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br label %bb46
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bb46: ; preds = %bb3
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ret void
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}
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declare noalias i8* @malloc() nounwind
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declare i32 @ptou()
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