diff options
Diffstat (limited to 'llvm/test/Transforms/MergeICmps/pair-int32-int32.ll')
| -rw-r--r-- | llvm/test/Transforms/MergeICmps/pair-int32-int32.ll | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/llvm/test/Transforms/MergeICmps/pair-int32-int32.ll b/llvm/test/Transforms/MergeICmps/pair-int32-int32.ll new file mode 100644 index 00000000000..351cb2adedf --- /dev/null +++ b/llvm/test/Transforms/MergeICmps/pair-int32-int32.ll @@ -0,0 +1,87 @@ +; RUN: opt -mergeicmps -S -o - %s | FileCheck %s + +%"struct.std::pair" = type { i32, i32 } + +define zeroext i1 @opeq1( + %"struct.std::pair"* nocapture readonly dereferenceable(8) %a, + %"struct.std::pair"* nocapture readonly dereferenceable(8) %b) local_unnamed_addr #0 { +entry: + %first.i = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* %a, i64 0, i32 0 + %0 = load i32, i32* %first.i, align 4 + %first1.i = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* %b, i64 0, i32 0 + %1 = load i32, i32* %first1.i, align 4 + %cmp.i = icmp eq i32 %0, %1 + br i1 %cmp.i, label %land.rhs.i, label %opeq1.exit + +land.rhs.i: + %second.i = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* %a, i64 0, i32 1 + %2 = load i32, i32* %second.i, align 4 + %second2.i = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* %b, i64 0, i32 1 + %3 = load i32, i32* %second2.i, align 4 + %cmp3.i = icmp eq i32 %2, %3 + br label %opeq1.exit + +opeq1.exit: + %4 = phi i1 [ false, %entry ], [ %cmp3.i, %land.rhs.i ] + ret i1 %4 +; CHECK-LABEL: @opeq1( +; The entry block with zero-offset GEPs is kept, loads are removed. +; CHECK: entry +; CHECK: getelementptr {{.*}} i32 0 +; CHECK-NOT: load +; CHECK: getelementptr {{.*}} i32 0 +; CHECK-NOT: load +; The two 4 byte loads and compares are replaced with a single 8-byte memcmp. +; CHECK: @memcmp({{.*}}8) +; CHECK: icmp eq {{.*}} 0 +; The branch is now a direct branch; the other block has been removed. +; CHECK: br label %opeq1.exit +; CHECK-NOT: br +; The phi is updated. +; CHECK: phi i1 [ %{{[^,]*}}, %entry ] +; CHECK-NEXT: ret +} + +; Same as above, but the two blocks are in inverse order. +define zeroext i1 @opeq1_inverse( + %"struct.std::pair"* nocapture readonly dereferenceable(8) %a, + %"struct.std::pair"* nocapture readonly dereferenceable(8) %b) local_unnamed_addr #0 { +entry: + %first.i = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* %a, i64 0, i32 1 + %0 = load i32, i32* %first.i, align 4 + %first1.i = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* %b, i64 0, i32 1 + %1 = load i32, i32* %first1.i, align 4 + %cmp.i = icmp eq i32 %0, %1 + br i1 %cmp.i, label %land.rhs.i, label %opeq1.exit + +land.rhs.i: + %second.i = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* %a, i64 0, i32 0 + %2 = load i32, i32* %second.i, align 4 + %second2.i = getelementptr inbounds %"struct.std::pair", %"struct.std::pair"* %b, i64 0, i32 0 + %3 = load i32, i32* %second2.i, align 4 + %cmp3.i = icmp eq i32 %2, %3 + br label %opeq1.exit + +opeq1.exit: + %4 = phi i1 [ false, %entry ], [ %cmp3.i, %land.rhs.i ] + ret i1 %4 +; CHECK-LABEL: @opeq1_inverse( +; The second block with zero-offset GEPs is kept, loads are removed. +; CHECK: land.rhs.i +; CHECK: getelementptr {{.*}} i32 0 +; CHECK-NOT: load +; CHECK: getelementptr {{.*}} i32 0 +; CHECK-NOT: load +; The two 4 byte loads and compares are replaced with a single 8-byte memcmp. +; CHECK: @memcmp({{.*}}8) +; CHECK: icmp eq {{.*}} 0 +; The branch is now a direct branch; the other block has been removed. +; CHECK: br label %opeq1.exit +; CHECK-NOT: br +; The phi is updated. +; CHECK: phi i1 [ %{{[^,]*}}, %land.rhs.i ] +; CHECK-NEXT: ret +} + + + |
