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| author | Hans Wennborg <hans@hanshq.net> | 2014-06-20 00:38:12 +0000 |
|---|---|---|
| committer | Hans Wennborg <hans@hanshq.net> | 2014-06-20 00:38:12 +0000 |
| commit | 160dcf5b61b8d328cd1705a90c1e0ae27dcabd41 (patch) | |
| tree | 78b0a3f152e6c4972f3908fbe5b8c535da137edc /test | |
| parent | 6fda71e05edc6447f780dee7fff8bd4bf543f39e (diff) | |
| download | llvm-160dcf5b61b8d328cd1705a90c1e0ae27dcabd41.tar.gz llvm-160dcf5b61b8d328cd1705a90c1e0ae27dcabd41.tar.bz2 llvm-160dcf5b61b8d328cd1705a90c1e0ae27dcabd41.tar.xz | |
Don't build switch lookup tables for dllimport or TLS variables
We would previously put dllimport variables in switch lookup tables, which
doesn't work because the address cannot be used in a constant initializer.
This is basically the same problem that we have in PR19955.
Putting TLS variables in switch tables also desn't work, because the
address of such a variable is not constant.
Differential Revision: http://reviews.llvm.org/D4220
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211331 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll b/test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll index 81079b1aa5..ee63d2c0c0 100644 --- a/test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll +++ b/test/Transforms/SimplifyCFG/X86/switch_to_lookup_table.ll @@ -918,3 +918,55 @@ return: ; CHECK: switch i32 ; CHECK-NOT: @switch.table } + +; Don't build tables for switches with TLS variables. +@tls_a = thread_local global i32 0 +@tls_b = thread_local global i32 0 +@tls_c = thread_local global i32 0 +@tls_d = thread_local global i32 0 +define i32* @tls(i32 %x) { +entry: + switch i32 %x, label %sw.default [ + i32 0, label %return + i32 1, label %sw.bb1 + i32 2, label %sw.bb2 + ] +sw.bb1: + br label %return +sw.bb2: + br label %return +sw.default: + br label %return +return: + %retval.0 = phi i32* [ @tls_d, %sw.default ], [ @tls_c, %sw.bb2 ], [ @tls_b, %sw.bb1 ], [ @tls_a, %entry ] + ret i32* %retval.0 +; CHECK-LABEL: @tls( +; CHECK: switch i32 +; CHECK-NOT: @switch.table +} + +; Don't build tables for switches with dllimport variables. +@dllimport_a = external dllimport global i32 +@dllimport_b = external dllimport global i32 +@dllimport_c = external dllimport global i32 +@dllimport_d = external dllimport global i32 +define i32* @dllimport(i32 %x) { +entry: + switch i32 %x, label %sw.default [ + i32 0, label %return + i32 1, label %sw.bb1 + i32 2, label %sw.bb2 + ] +sw.bb1: + br label %return +sw.bb2: + br label %return +sw.default: + br label %return +return: + %retval.0 = phi i32* [ @dllimport_d, %sw.default ], [ @dllimport_c, %sw.bb2 ], [ @dllimport_b, %sw.bb1 ], [ @dllimport_a, %entry ] + ret i32* %retval.0 +; CHECK-LABEL: @dllimport( +; CHECK: switch i32 +; CHECK-NOT: @switch.table +} |