[EVM][InlineCost] Add pre-commit tests for Set threshold to a small value when BB is unreachable-terminated

Add positive and negative tests to show why in some
cases is preferable to inline when BB is
unreachable-terminated. Functions callee_inline is
taken from real world example where inlining this
function reduces one SLOAD after optimizations (we have
the same load from the callers and in the callee).

Signed-off-by: Vladimir Radosavljevic <[email protected]>

Author: vladimirradosavljevic

llvm/test/CodeGen/EVM/inline-in-bb-unreachable-terminated.ll

@@ -0,0 +1,79 @@
+; RUN: opt -passes=inline -S < %s | FileCheck %s
+
+target datalayout = "E-p:256:256-i256:256:256-S256-a:256:256"
+target triple = "evm"
+
+; CHECK-LABEL: define private void @callee_inline
+define private void @callee_inline(i256 %arg) {
+entry:
+  %itptr = inttoptr i256 %arg to ptr addrspace(5)
+  %load = load i256, ptr addrspace(5) %itptr, align 1
+  %and = and i256 %load, 1461501637330902918203684832716283019655932542975
+  %cmp = icmp eq i256 %and, 0
+  br i1 %cmp, label %bb1, label %bb2
+
+bb1:
+  store i256 32754936060235842233766999496646880210696060726502698976450834618736336437248, ptr addrspace(1) null, align 32
+  tail call void @llvm.evm.revert(ptr addrspace(1) null, i256 32)
+  unreachable
+
+bb2:
+  ret void
+}
+
+; CHECK-LABEL: define void @caller_inline1
+define void @caller_inline1(i256 %arg) {
+entry:
+; CHECK: call void @callee_inline(i256 %arg)
+  call void @callee_inline(i256 %arg)
+  %itptr = inttoptr i256 %arg to ptr addrspace(5)
+  %load = load i256, ptr addrspace(5) %itptr, align 1
+  store i256 %load, ptr addrspace(1) null, align 32
+  call void @llvm.evm.return(ptr addrspace(1) null, i256 32)
+  unreachable
+}
+
+; CHECK-LABEL: define void @caller_inline2
+define void @caller_inline2(i256 %arg1, i256 %arg2) {
+entry:
+; CHECK: call void @callee_inline(i256 %arg2)
+  call void @callee_inline(i256 %arg2)
+  %itptr = inttoptr i256 %arg2 to ptr addrspace(5)
+  %load = load i256, ptr addrspace(5) %itptr, align 1
+  store i256 %load, ptr addrspace(1) null, align 32
+  call void @llvm.evm.return(ptr addrspace(1) null, i256 32)
+  unreachable
+}
+
+; CHECK-LABEL: define private void @callee_noinline
+define private void @callee_noinline() {
+entry:
+  store i256 128, ptr addrspace(5) inttoptr (i256 32 to ptr addrspace(5)), align 32
+  store i256 128, ptr addrspace(5) inttoptr (i256 64 to ptr addrspace(5)), align 32
+  store i256 128, ptr addrspace(5) inttoptr (i256 96 to ptr addrspace(5)), align 32
+  store i256 128, ptr addrspace(5) inttoptr (i256 128 to ptr addrspace(5)), align 32
+  store i256 128, ptr addrspace(5) inttoptr (i256 160 to ptr addrspace(5)), align 32
+  store i256 128, ptr addrspace(5) inttoptr (i256 192 to ptr addrspace(5)), align 32
+  store i256 128, ptr addrspace(5) inttoptr (i256 224 to ptr addrspace(5)), align 32
+  store i256 128, ptr addrspace(5) inttoptr (i256 256 to ptr addrspace(5)), align 32
+  store i256 128, ptr addrspace(5) inttoptr (i256 288 to ptr addrspace(5)), align 32
+  ret void
+}
+
+; CHECK-LABEL: define void @caller_noinline1
+define void @caller_noinline1() {
+entry:
+; CHECK: call void @callee_noinline()
+  call void @callee_noinline()
+  call void @llvm.evm.return(ptr addrspace(1) null, i256 0)
+  unreachable
+}
+
+; CHECK-LABEL: define void @caller_noinline2
+define void @caller_noinline2() {
+entry:
+; CHECK: call void @callee_noinline()
+  call void @callee_noinline()
+  call void @llvm.evm.return(ptr addrspace(1) null, i256 0)
+  unreachable
+}