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Diffstat (limited to 'test/CodeGen/Generic/undef-phi.ll')
-rw-r--r-- | test/CodeGen/Generic/undef-phi.ll | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/test/CodeGen/Generic/undef-phi.ll b/test/CodeGen/Generic/undef-phi.ll new file mode 100644 index 0000000..10899f9 --- /dev/null +++ b/test/CodeGen/Generic/undef-phi.ll @@ -0,0 +1,26 @@ +; RUN: llc < %s -verify-machineinstrs -verify-coalescing +; +; This function has a PHI with one undefined input. Verify that PHIElimination +; inserts an IMPLICIT_DEF instruction in the predecessor so all paths to the use +; pass through a def. + +%struct.xx_stack = type { i32, %struct.xx_stack* } + +define i32 @push(%struct.xx_stack* %stack) nounwind uwtable readonly ssp { +entry: + %tobool1 = icmp eq %struct.xx_stack* %stack, null + br i1 %tobool1, label %for.end, label %for.body + +for.body: + %stack.addr.02 = phi %struct.xx_stack* [ %0, %for.body ], [ %stack, %entry ] + %next = getelementptr inbounds %struct.xx_stack* %stack.addr.02, i64 0, i32 1 + %0 = load %struct.xx_stack** %next, align 8 + %tobool = icmp eq %struct.xx_stack* %0, null + br i1 %tobool, label %for.end, label %for.body + +for.end: + %top.0.lcssa = phi %struct.xx_stack* [ undef, %entry ], [ %stack.addr.02, %for.body ] + %first = getelementptr inbounds %struct.xx_stack* %top.0.lcssa, i64 0, i32 0 + %1 = load i32* %first, align 4 + ret i32 %1 +} |