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| author | Hal Finkel <hfinkel@anl.gov> | 2015-10-28 23:43:00 +0000 |
|---|---|---|
| committer | Hal Finkel <hfinkel@anl.gov> | 2015-10-28 23:43:00 +0000 |
| commit | 7d0e34eb33d2cfa44e393feb3bc387e004306919 (patch) | |
| tree | 278ecd2d06e4422bc8f9e8729bd315cac5d988a3 /llvm/test/CodeGen | |
| parent | 22f637a30b035e67078d93aee2cc0a33b5b8d355 (diff) | |
| download | bcm5719-llvm-7d0e34eb33d2cfa44e393feb3bc387e004306919.tar.gz bcm5719-llvm-7d0e34eb33d2cfa44e393feb3bc387e004306919.zip | |
[PowerPC] Recurse through constants when looking for TLS globals
We cannot form ctr-based loops around function calls, including calls to
__tls_get_addr used for PIC TLS variables. References to such TLS variables,
however, might be buried within constant expressions, and so we need to search
the entire constant expression to be sure that no references to such TLS
variables exist.
Fixes PR25256, reported by Eric Schweitz. This is a slightly-modified version
of the patch suggested by Eric in the bug report, and a test case I created.
llvm-svn: 251582
Diffstat (limited to 'llvm/test/CodeGen')
| -rw-r--r-- | llvm/test/CodeGen/PowerPC/ctr-loop-tls-const.ll | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/PowerPC/ctr-loop-tls-const.ll b/llvm/test/CodeGen/PowerPC/ctr-loop-tls-const.ll new file mode 100644 index 00000000000..01f837cb993 --- /dev/null +++ b/llvm/test/CodeGen/PowerPC/ctr-loop-tls-const.ll @@ -0,0 +1,40 @@ +; RUN: llc -mcpu=pwr7 -relocation-model=pic < %s | FileCheck %s +target datalayout = "E-m:e-i64:64-n32:64" +target triple = "powerpc64-unknown-linux-gnu" + +@x = thread_local global [1600 x i32] zeroinitializer, align 4 + +; Function Attrs: nounwind +define void @foo(i32 signext %v) #0 { +entry: + br label %vector.body + +vector.body: ; preds = %vector.body, %entry + %index = phi i64 [ 0, %entry ], [ %index.next, %vector.body ] + %induction5 = or i64 %index, 1 + %0 = getelementptr inbounds [1600 x i32], [1600 x i32]* @x, i64 0, i64 %index + %1 = getelementptr inbounds [1600 x i32], [1600 x i32]* @x, i64 0, i64 %induction5 + %2 = load i32, i32* %0, align 4 + %3 = load i32, i32* %1, align 4 + %4 = add nsw i32 %2, %v + %5 = add nsw i32 %3, %v + store i32 %4, i32* %0, align 4 + store i32 %5, i32* %1, align 4 + %index.next = add i64 %index, 2 + %6 = icmp eq i64 %index.next, 1600 + br i1 %6, label %for.cond.cleanup, label %vector.body + +for.cond.cleanup: ; preds = %vector.body + ret void +} + +; CHECK-LABEL: @foo +; CHECK-NOT: mtctr +; CHECK: __tls_get_addr + +attributes #0 = { nounwind } + +!llvm.module.flags = !{!0} + +!0 = !{i32 1, !"PIC Level", i32 2} + |
