diff options
Diffstat (limited to 'llvm/test/Transforms/Reassociate/long-chains.ll')
| -rw-r--r-- | llvm/test/Transforms/Reassociate/long-chains.ll | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/llvm/test/Transforms/Reassociate/long-chains.ll b/llvm/test/Transforms/Reassociate/long-chains.ll new file mode 100644 index 00000000000..b0de1c6719e --- /dev/null +++ b/llvm/test/Transforms/Reassociate/long-chains.ll @@ -0,0 +1,37 @@ +; RUN: opt < %s -reassociate -stats -S 2>&1 | FileCheck %s +; REQUIRES: asserts + +define i8 @longchain(i8 %in1, i8 %in2, i8 %in3, i8 %in4, i8 %in5, i8 %in6, i8 %in7, i8 %in8, i8 %in9, i8 %in10, i8 %in11, i8 %in12, i8 %in13, i8 %in14, i8 %in15, i8 %in16, i8 %in17, i8 %in18, i8 %in19, i8 %in20) { + %tmp1 = add i8 %in1, %in2 + %tmp2 = add i8 %tmp1, %in3 + %tmp3 = add i8 %tmp2, %in4 + %tmp4 = add i8 %tmp3, %in3 + %tmp5 = add i8 %tmp4, %in4 + %tmp6 = add i8 %tmp5, %in5 + %tmp7 = add i8 %tmp6, %in6 + %tmp8 = add i8 %tmp7, %in7 + %tmp9 = add i8 %tmp8, %in8 + %tmp10 = add i8 %tmp9, %in9 + %tmp11 = add i8 %tmp10, %in10 + %tmp12 = add i8 %tmp11, %in11 + %tmp13 = add i8 %tmp12, %in12 + %tmp14 = add i8 %tmp13, %in13 + %tmp15 = add i8 %tmp14, %in14 + %tmp16 = add i8 %tmp15, %in15 + %tmp17 = add i8 %tmp16, %in16 + %tmp18 = add i8 %tmp17, %in17 + %tmp19 = add i8 %tmp18, %in18 + %tmp20 = add i8 %tmp19, %in19 + %tmp21 = add i8 %tmp20, %in20 + ret i8 %tmp20 +} + +; Check the number of instructions reassociated is in the tens not the hundreds. +; At the time of writing, the exact numbers were: +; Bad order: 220 reassociate - Number of insts reassociated +; Good order: 55 reassociate - Number of insts reassociated +; +; CHECK: {{^[1-9][0-9]}} reassociate - Number of insts reassociated + +; Additionally check that we made at least three changes. +; CHECK: {{^ *[3-9]}} reassociate - Number of multiplies factored |
