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llvm-mirror/test/CodeGen/Thumb2/thumb2-cbnz.ll

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ARM & AArch64: make use of common cmpxchg idioms after expansion 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
2014-05-30 12:09:59 +02:00
; RUN: llc < %s -mtriple=thumbv7-apple-darwin -mcpu=cortex-a8 -arm-atomic-cfg-tidy=0 | FileCheck %s
Use cbz and cbnz instructions. llvm-svn: 85698
2009-11-01 00:46:45 +01:00
; rdar://7354379
Teach SelectionDAG to match more calls to libm functions onto existing SDNodes. Mark these nodes as illegal by default, unless the target declares otherwise. llvm-svn: 146171
2011-12-08 20:32:14 +01:00
declare double @foo(double) nounwind readnone
Use cbz and cbnz instructions. llvm-svn: 85698
2009-11-01 00:46:45 +01:00
Since I can't reproduce the failures from 131261, re-trying with a simplified version. <rdar://problem/9298790> llvm-svn: 131274
2011-05-13 02:51:54 +02:00
define void @t(i32 %c, double %b) {
Use cbz and cbnz instructions. llvm-svn: 85698
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entry:
Since I can't reproduce the failures from 131261, re-trying with a simplified version. <rdar://problem/9298790> llvm-svn: 131274
2011-05-13 02:51:54 +02:00
%cmp1 = icmp ne i32 %c, 0
br i1 %cmp1, label %bb3, label %bb1
Use cbz and cbnz instructions. llvm-svn: 85698
2009-11-01 00:46:45 +01:00
bb1: ; preds = %entry
unreachable
bb3: ; preds = %entry
Since I can't reproduce the failures from 131261, re-trying with a simplified version. <rdar://problem/9298790> llvm-svn: 131274
2011-05-13 02:51:54 +02:00
%cmp2 = icmp ne i32 %c, 0
br i1 %cmp2, label %bb7, label %bb5
Use cbz and cbnz instructions. llvm-svn: 85698
2009-11-01 00:46:45 +01:00
bb5: ; preds = %bb3
unreachable
bb7: ; preds = %bb3
Since I can't reproduce the failures from 131261, re-trying with a simplified version. <rdar://problem/9298790> llvm-svn: 131274
2011-05-13 02:51:54 +02:00
%cmp3 = icmp ne i32 %c, 0
br i1 %cmp3, label %bb11, label %bb9
Use cbz and cbnz instructions. llvm-svn: 85698
2009-11-01 00:46:45 +01:00
bb9: ; preds = %bb7
Since I can't reproduce the failures from 131261, re-trying with a simplified version. <rdar://problem/9298790> llvm-svn: 131274
2011-05-13 02:51:54 +02:00
; CHECK: cmp r0, #0
; CHECK-NEXT: cbnz
Teach SelectionDAG to match more calls to libm functions onto existing SDNodes. Mark these nodes as illegal by default, unless the target declares otherwise. llvm-svn: 146171
2011-12-08 20:32:14 +01:00
%0 = tail call double @foo(double %b) nounwind readnone ; <double> [#uses=0]
Use cbz and cbnz instructions. llvm-svn: 85698
2009-11-01 00:46:45 +01:00
br label %bb11
bb11: ; preds = %bb9, %bb7
%1 = getelementptr i32* undef, i32 0
store i32 0, i32* %1
ret void
}
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