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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
77 lines
3.2 KiB
LLVM
77 lines
3.2 KiB
LLVM
; RUN: llc < %s -mtriple=thumbv7-apple-darwin -arm-atomic-cfg-tidy=0 -mcpu=cortex-a8 -relocation-model=pic -disable-fp-elim | FileCheck %s
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; rdar://7352504
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; Make sure we use "str r9, [sp, #+28]" instead of "sub.w r4, r7, #256" followed by "str r9, [r4, #-32]".
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%0 = type { i16, i8, i8 }
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%1 = type { [2 x i32], [2 x i32] }
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%2 = type { %union.rec* }
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%struct.FILE_POS = type { i8, i8, i16, i32 }
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%struct.GAP = type { i8, i8, i16 }
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%struct.LIST = type { %union.rec*, %union.rec* }
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%struct.STYLE = type { %union.anon, %union.anon, i16, i16, i32 }
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%struct.head_type = type { [2 x %struct.LIST], %union.FIRST_UNION, %union.SECOND_UNION, %union.THIRD_UNION, %union.FOURTH_UNION, %union.rec*, %2, %union.rec*, %union.rec*, %union.rec*, %union.rec*, %union.rec*, %union.rec*, %union.rec*, %union.rec*, i32 }
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%union.FIRST_UNION = type { %struct.FILE_POS }
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%union.FOURTH_UNION = type { %struct.STYLE }
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%union.SECOND_UNION = type { %0 }
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%union.THIRD_UNION = type { %1 }
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%union.anon = type { %struct.GAP }
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%union.rec = type { %struct.head_type }
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@zz_hold = external global %union.rec* ; <%union.rec**> [#uses=2]
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@zz_res = external global %union.rec* ; <%union.rec**> [#uses=1]
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define %union.rec* @Manifest(%union.rec* %x, %union.rec* %env, %struct.STYLE* %style, %union.rec** %bthr, %union.rec** %fthr, %union.rec** %target, %union.rec** %crs, i32 %ok, i32 %need_expand, %union.rec** %enclose, i32 %fcr) nounwind {
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entry:
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; CHECK: ldr{{(.w)?}} {{(r[0-9]+)|(lr)}}, [r7, #28]
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%xgaps.i = alloca [32 x %union.rec*], align 4 ; <[32 x %union.rec*]*> [#uses=0]
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%ycomp.i = alloca [32 x %union.rec*], align 4 ; <[32 x %union.rec*]*> [#uses=0]
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br label %bb20
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bb20: ; preds = %entry
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switch i32 undef, label %bb1287 [
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i32 11, label %bb119
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i32 12, label %bb119
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i32 21, label %bb420
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i32 23, label %bb420
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i32 45, label %bb438
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i32 46, label %bb438
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i32 55, label %bb533
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i32 56, label %bb569
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i32 64, label %bb745
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i32 78, label %bb1098
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]
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bb119: ; preds = %bb20, %bb20
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unreachable
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bb420: ; preds = %bb20, %bb20
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; CHECK: bb420
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; CHECK: str{{(.w)?}} r{{[0-9]+}}, [sp
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; CHECK: str{{(.w)?}} r{{[0-9]+}}, [sp
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; CHECK: str{{(.w)?}} r{{[0-9]+}}, [sp
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; CHECK: str{{(.w)?}} r{{[0-9]+}}, [sp
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store %union.rec* null, %union.rec** @zz_hold, align 4
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store %union.rec* null, %union.rec** @zz_res, align 4
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store %union.rec* %x, %union.rec** @zz_hold, align 4
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%0 = call %union.rec* @Manifest(%union.rec* undef, %union.rec* %env, %struct.STYLE* %style, %union.rec** %bthr, %union.rec** %fthr, %union.rec** %target, %union.rec** %crs, i32 %ok, i32 %need_expand, %union.rec** %enclose, i32 %fcr) nounwind ; <%union.rec*> [#uses=0]
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unreachable
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bb438: ; preds = %bb20, %bb20
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unreachable
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bb533: ; preds = %bb20
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ret %union.rec* %x
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bb569: ; preds = %bb20
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unreachable
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bb745: ; preds = %bb20
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unreachable
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bb1098: ; preds = %bb20
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unreachable
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bb1287: ; preds = %bb20
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unreachable
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}
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