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| author | Tim Northover <tnorthover@apple.com> | 2016-04-18 21:48:55 +0000 |
|---|---|---|
| committer | Tim Northover <tnorthover@apple.com> | 2016-04-18 21:48:55 +0000 |
| commit | b629c77692980a03cf4529cd39aff82f65e0478c (patch) | |
| tree | f4f2b091954a44689c611a42511038eb733b3606 /llvm/test/Transforms | |
| parent | 5235a1b603db838df51c91782ca98155d892ff9f (diff) | |
| download | bcm5719-llvm-b629c77692980a03cf4529cd39aff82f65e0478c.tar.gz bcm5719-llvm-b629c77692980a03cf4529cd39aff82f65e0478c.zip | |
ARM: use a pseudo-instruction for cmpxchg at -O0.
The fast register-allocator cannot cope with inter-block dependencies without
spilling. This is fine for ldrex/strex loops coming from atomicrmw instructions
where any value produced within a block is dead by the end, but not for
cmpxchg. So we lower a cmpxchg at -O0 via a pseudo-inst that gets expanded
after regalloc.
Fortunately this is at -O0 so we don't have to care about performance. This
simplifies the various axes of expansion considerably: we assume a strong
seq_cst operation and ensure ordering via the always-present DMB instructions
rather than v8 acquire/release instructions.
Should fix the 32-bit part of PR25526.
llvm-svn: 266679
Diffstat (limited to 'llvm/test/Transforms')
3 files changed, 3 insertions, 3 deletions
diff --git a/llvm/test/Transforms/AtomicExpand/ARM/atomic-expansion-v7.ll b/llvm/test/Transforms/AtomicExpand/ARM/atomic-expansion-v7.ll index 31d970f7ef1..5e84460b9c0 100644 --- a/llvm/test/Transforms/AtomicExpand/ARM/atomic-expansion-v7.ll +++ b/llvm/test/Transforms/AtomicExpand/ARM/atomic-expansion-v7.ll @@ -1,4 +1,4 @@ -; RUN: opt -S -o - -mtriple=armv7-apple-ios7.0 -atomic-expand %s | FileCheck %s +; RUN: opt -S -o - -mtriple=armv7-apple-ios7.0 -atomic-expand -codegen-opt-level=1 %s | FileCheck %s define i8 @test_atomic_xchg_i8(i8* %ptr, i8 %xchgend) { ; CHECK-LABEL: @test_atomic_xchg_i8 diff --git a/llvm/test/Transforms/AtomicExpand/ARM/atomic-expansion-v8.ll b/llvm/test/Transforms/AtomicExpand/ARM/atomic-expansion-v8.ll index 7bb6ffed397..8397182e7e8 100644 --- a/llvm/test/Transforms/AtomicExpand/ARM/atomic-expansion-v8.ll +++ b/llvm/test/Transforms/AtomicExpand/ARM/atomic-expansion-v8.ll @@ -1,4 +1,4 @@ -; RUN: opt -S -o - -mtriple=armv8-linux-gnueabihf -atomic-expand %s | FileCheck %s +; RUN: opt -S -o - -mtriple=armv8-linux-gnueabihf -atomic-expand %s -codegen-opt-level=1 | FileCheck %s define i8 @test_atomic_xchg_i8(i8* %ptr, i8 %xchgend) { ; CHECK-LABEL: @test_atomic_xchg_i8 diff --git a/llvm/test/Transforms/AtomicExpand/ARM/cmpxchg-weak.ll b/llvm/test/Transforms/AtomicExpand/ARM/cmpxchg-weak.ll index 02e4dd1f1d5..375b41a26db 100644 --- a/llvm/test/Transforms/AtomicExpand/ARM/cmpxchg-weak.ll +++ b/llvm/test/Transforms/AtomicExpand/ARM/cmpxchg-weak.ll @@ -1,4 +1,4 @@ -; RUN: opt -atomic-expand -S -mtriple=thumbv7s-apple-ios7.0 %s | FileCheck %s +; RUN: opt -atomic-expand -codegen-opt-level=1 -S -mtriple=thumbv7s-apple-ios7.0 %s | FileCheck %s define i32 @test_cmpxchg_seq_cst(i32* %addr, i32 %desired, i32 %new) { ; CHECK-LABEL: @test_cmpxchg_seq_cst |
