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| author | Guozhi Wei <carrot@google.com> | 2018-03-15 17:49:12 +0000 |
|---|---|---|
| committer | Guozhi Wei <carrot@google.com> | 2018-03-15 17:49:12 +0000 |
| commit | 9c916584ba198dfcd21cea645ac1406e399e5b30 (patch) | |
| tree | a4aab49e328976fe0786aa5ff4b13fbe6f5fb77e /llvm/test/CodeGen/PowerPC | |
| parent | 48b758e8ad14a5553326eaf3b2365b73162c6a24 (diff) | |
| download | bcm5719-llvm-9c916584ba198dfcd21cea645ac1406e399e5b30.tar.gz bcm5719-llvm-9c916584ba198dfcd21cea645ac1406e399e5b30.zip | |
[PPC] Avoid non-simple MVT in STBRX optimization
PR35402 triggered this case. It bswap and stores a 48bit value, current STBRX optimization transforms it into STBRX. Unfortunately 48bit is not a simple MVT, there is no PPC instruction to support it, and it can't be automatically expanded by llvm, so caused a crash.
This patch detects the non-simple MVT and returns early.
Differential Revision: https://reviews.llvm.org/D44500
llvm-svn: 327651
Diffstat (limited to 'llvm/test/CodeGen/PowerPC')
| -rw-r--r-- | llvm/test/CodeGen/PowerPC/pr35402.ll | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/PowerPC/pr35402.ll b/llvm/test/CodeGen/PowerPC/pr35402.ll new file mode 100644 index 00000000000..06e6d963b13 --- /dev/null +++ b/llvm/test/CodeGen/PowerPC/pr35402.ll @@ -0,0 +1,18 @@ +; RUN: llc -O2 < %s | FileCheck %s +target triple = "powerpc64le-linux-gnu" + +define void @test(i8* %p, i64 %data) { +entry: + %0 = tail call i64 @llvm.bswap.i64(i64 %data) + %ptr = bitcast i8* %p to i48* + %val = trunc i64 %0 to i48 + store i48 %val, i48* %ptr, align 1 + ret void + +; CHECK: sth +; CHECK: stw +; CHECK-NOT: stdbrx + +} + +declare i64 @llvm.bswap.i64(i64) |
