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llvm-mirror/test/CodeGen/AArch64/atomic-ops-not-barriers.ll

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AArch64: remove barriers from AArch64 atomic operations. I've managed to convince myself that AArch64's acquire/release instructions are sufficient to guarantee C++11's required semantics, even in the sequentially-consistent case. llvm-svn: 179005
2013-04-08 10:40:41 +02:00
; RUN: llc -mtriple=aarch64-none-linux-gnu -verify-machineinstrs < %s | FileCheck %s
Add AArch64 as an experimental target. This patch adds support for AArch64 (ARM's 64-bit architecture) to LLVM in the "experimental" category. Currently, it won't be built unless requested explicitly. This initial commit should have support for: + Assembly of all scalar (i.e. non-NEON, non-Crypto) instructions (except the late addition CRC instructions). + CodeGen features required for C++03 and C99. + Compilation for the "small" memory model: code+static data < 4GB. + Absolute and position-independent code. + GNU-style (i.e. "__thread") TLS. + Debugging information. The principal omission, currently, is performance tuning. This patch excludes the NEON support also reviewed due to an outbreak of batshit insanity in our legal department. That will be committed soon bringing the changes to precisely what has been approved. Further reviews would be gratefully received. llvm-svn: 174054
2013-01-31 13:12:40 +01:00
define i32 @foo(i32* %var, i1 %cond) {
Mass update to CodeGen tests to use CHECK-LABEL for labels corresponding to function definitions for more informative error messages. No functionality change and all updated tests passed locally. This update was done with the following bash script: find test/CodeGen -name "*.ll" | \ while read NAME; do echo "$NAME" if ! grep -q "^; *RUN: *llc.*debug" $NAME; then TEMP=`mktemp -t temp` cp $NAME $TEMP sed -n "s/^define [^@]*@\([A-Za-z0-9_]*\)(.*$/\1/p" < $NAME | \ while read FUNC; do sed -i '' "s/;\(.*\)\([A-Za-z0-9_-]*\):\( *\)$FUNC: *\$/;\1\2-LABEL:\3$FUNC:/g" $TEMP done sed -i '' "s/;\(.*\)-LABEL-LABEL:/;\1-LABEL:/" $TEMP sed -i '' "s/;\(.*\)-NEXT-LABEL:/;\1-NEXT:/" $TEMP sed -i '' "s/;\(.*\)-NOT-LABEL:/;\1-NOT:/" $TEMP sed -i '' "s/;\(.*\)-DAG-LABEL:/;\1-DAG:/" $TEMP mv $TEMP $NAME fi done llvm-svn: 186280
2013-07-14 08:24:09 +02:00
; CHECK-LABEL: foo:
Add AArch64 as an experimental target. This patch adds support for AArch64 (ARM's 64-bit architecture) to LLVM in the "experimental" category. Currently, it won't be built unless requested explicitly. This initial commit should have support for: + Assembly of all scalar (i.e. non-NEON, non-Crypto) instructions (except the late addition CRC instructions). + CodeGen features required for C++03 and C99. + Compilation for the "small" memory model: code+static data < 4GB. + Absolute and position-independent code. + GNU-style (i.e. "__thread") TLS. + Debugging information. The principal omission, currently, is performance tuning. This patch excludes the NEON support also reviewed due to an outbreak of batshit insanity in our legal department. That will be committed soon bringing the changes to precisely what has been approved. Further reviews would be gratefully received. llvm-svn: 174054
2013-01-31 13:12:40 +01:00
br i1 %cond, label %atomic_ver, label %simple_ver
simple_ver:
%oldval = load i32* %var
%newval = add nsw i32 %oldval, -1
store i32 %newval, i32* %var
br label %somewhere
atomic_ver:
AArch64: remove barriers from AArch64 atomic operations. I've managed to convince myself that AArch64's acquire/release instructions are sufficient to guarantee C++11's required semantics, even in the sequentially-consistent case. llvm-svn: 179005
2013-04-08 10:40:41 +02:00
fence seq_cst
%val = atomicrmw add i32* %var, i32 -1 monotonic
fence seq_cst
Add AArch64 as an experimental target. This patch adds support for AArch64 (ARM's 64-bit architecture) to LLVM in the "experimental" category. Currently, it won't be built unless requested explicitly. This initial commit should have support for: + Assembly of all scalar (i.e. non-NEON, non-Crypto) instructions (except the late addition CRC instructions). + CodeGen features required for C++03 and C99. + Compilation for the "small" memory model: code+static data < 4GB. + Absolute and position-independent code. + GNU-style (i.e. "__thread") TLS. + Debugging information. The principal omission, currently, is performance tuning. This patch excludes the NEON support also reviewed due to an outbreak of batshit insanity in our legal department. That will be committed soon bringing the changes to precisely what has been approved. Further reviews would be gratefully received. llvm-svn: 174054
2013-01-31 13:12:40 +01:00
br label %somewhere
; CHECK: dmb
; CHECK: ldxr
; CHECK: dmb
; The key point here is that the second dmb isn't immediately followed by the
; simple_ver basic block, which LLVM attempted to do when DMB had been marked
; with isBarrier. For now, look for something that looks like "somewhere".
; CHECK-NEXT: mov
somewhere:
%combined = phi i32 [ %val, %atomic_ver ], [ %newval, %simple_ver]
ret i32 %combined
}
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