[CGP] Precommit tests for PR76613 (NFC)

Author: antoniofrighetto

llvm/test/CodeGen/X86/tailcall-cgp-dup.ll

@@ -184,3 +184,171 @@ return:
   %retval = phi ptr [ %ptr, %if.then ], [ %obj, %entry ]
   ret ptr %retval
 }
+
+define ptr @memset_tailc(ptr %ret_val, i64 %sz) nounwind {
+; CHECK-LABEL: memset_tailc:
+; CHECK:       ## %bb.0: ## %entry
+; CHECK-NEXT:    pushq %rbx
+; CHECK-NEXT:    movq %rdi, %rbx
+; CHECK-NEXT:    testq %rdi, %rdi
+; CHECK-NEXT:    je LBB4_2
+; CHECK-NEXT:  ## %bb.1: ## %if.then
+; CHECK-NEXT:    movq %rsi, %rdx
+; CHECK-NEXT:    movq %rbx, %rdi
+; CHECK-NEXT:    xorl %esi, %esi
+; CHECK-NEXT:    callq _memset
+; CHECK-NEXT:  LBB4_2: ## %return
+; CHECK-NEXT:    movq %rbx, %rax
+; CHECK-NEXT:    popq %rbx
+; CHECK-NEXT:    retq
+entry:
+  %cmp = icmp eq ptr %ret_val, null
+  br i1 %cmp, label %return, label %if.then
+
+if.then:
+  tail call void @llvm.memset.p0.i64(ptr nonnull align 1 %ret_val, i8 0, i64 %sz, i1 false)
+  br label %return
+
+return:
+  ret ptr %ret_val
+}
+
+define ptr @baz_not_to_tailc(ptr %ret_val, ptr %arg) nounwind {
+; CHECK-LABEL: baz_not_to_tailc:
+; CHECK:       ## %bb.0: ## %entry
+; CHECK-NEXT:    pushq %rbx
+; CHECK-NEXT:    movq %rdi, %rbx
+; CHECK-NEXT:    testq %rdi, %rdi
+; CHECK-NEXT:    je LBB5_2
+; CHECK-NEXT:  ## %bb.1: ## %if.then
+; CHECK-NEXT:    movq %rbx, %rdi
+; CHECK-NEXT:    callq _baz
+; CHECK-NEXT:  LBB5_2: ## %return
+; CHECK-NEXT:    movq %rbx, %rax
+; CHECK-NEXT:    popq %rbx
+; CHECK-NEXT:    retq
+entry:
+  %cmp = icmp eq ptr %ret_val, null
+  br i1 %cmp, label %return, label %if.then
+
+if.then:
+  %rv = tail call ptr @baz(ptr %ret_val, ptr %arg)
+  br label %return
+
+return:
+  ret ptr %ret_val
+}
+
+define ptr @memcpy_tailc(ptr %ret_val, i64 %sz, ptr %src) nounwind {
+; CHECK-LABEL: memcpy_tailc:
+; CHECK:       ## %bb.0: ## %entry
+; CHECK-NEXT:    pushq %rbx
+; CHECK-NEXT:    testq %rsi, %rsi
+; CHECK-NEXT:    je LBB6_1
+; CHECK-NEXT:  ## %bb.2: ## %if.then
+; CHECK-NEXT:    movq %rsi, %rax
+; CHECK-NEXT:    movq %rdi, %rbx
+; CHECK-NEXT:    movq %rdx, %rsi
+; CHECK-NEXT:    movq %rax, %rdx
+; CHECK-NEXT:    callq _memcpy
+; CHECK-NEXT:    jmp LBB6_3
+; CHECK-NEXT:  LBB6_1:
+; CHECK-NEXT:    movq %rdx, %rbx
+; CHECK-NEXT:  LBB6_3: ## %return
+; CHECK-NEXT:    movq %rbx, %rax
+; CHECK-NEXT:    popq %rbx
+; CHECK-NEXT:    retq
+entry:
+  %cmp = icmp eq i64 %sz, 0
+  br i1 %cmp, label %return, label %if.then
+
+if.then:
+  tail call void @llvm.memcpy.p0.p0.i64(ptr align 1 %ret_val, ptr align 1 %src, i64 %sz, i1 false)
+  br label %return
+
+return:
+  %phi = phi ptr [ %ret_val, %if.then ], [ %src, %entry ]
+  ret ptr %phi
+}
+
+define ptr @strcpy_legal_and_baz_illegal(ptr %arg, i64 %sz, ptr %2) nounwind {
+; CHECK-LABEL: strcpy_legal_and_baz_illegal:
+; CHECK:       ## %bb.0: ## %entry
+; CHECK-NEXT:    pushq %r15
+; CHECK-NEXT:    pushq %r14
+; CHECK-NEXT:    pushq %rbx
+; CHECK-NEXT:    movq %rdx, %r14
+; CHECK-NEXT:    movq %rsi, %r15
+; CHECK-NEXT:    movq %rdi, %rbx
+; CHECK-NEXT:    movq %rsi, %rdi
+; CHECK-NEXT:    callq _malloc
+; CHECK-NEXT:    testq %r15, %r15
+; CHECK-NEXT:    je LBB7_2
+; CHECK-NEXT:  ## %bb.1: ## %if.then
+; CHECK-NEXT:    movq %rax, %rdi
+; CHECK-NEXT:    movq %r14, %rsi
+; CHECK-NEXT:    movq %rax, %rbx
+; CHECK-NEXT:    callq _strcpy
+; CHECK-NEXT:    jmp LBB7_3
+; CHECK-NEXT:  LBB7_2: ## %if.else
+; CHECK-NEXT:    movq %rbx, %rdi
+; CHECK-NEXT:    movq %r14, %rsi
+; CHECK-NEXT:    callq _baz
+; CHECK-NEXT:  LBB7_3: ## %return
+; CHECK-NEXT:    movq %rbx, %rax
+; CHECK-NEXT:    popq %rbx
+; CHECK-NEXT:    popq %r14
+; CHECK-NEXT:    popq %r15
+; CHECK-NEXT:    retq
+entry:
+  %strcpy_ret_val = tail call noalias ptr @malloc(i64 %sz)
+  %cmp = icmp eq i64 %sz, 0
+  br i1 %cmp, label %if.else, label %if.then
+
+if.then:
+  %rv_unused = tail call ptr @strcpy(ptr dereferenceable(1) %strcpy_ret_val, ptr dereferenceable(1) %2)
+  br label %return
+
+if.else:
+  %rv_unused_2 = tail call ptr @baz(ptr %arg, ptr %2)
+  br label %return
+
+return:
+  %phi = phi ptr [ %strcpy_ret_val, %if.then ], [ %arg, %if.else ]
+  ret ptr %phi
+}
+
+define ptr @memset_not_to_tailc(ptr %arg, i64 %sz, ptr %ret_val_1, ptr %ret_val_2) nounwind {
+; CHECK-LABEL: memset_not_to_tailc:
+; CHECK:       ## %bb.0: ## %entry
+; CHECK-NEXT:    movq %rdx, %rax
+; CHECK-NEXT:    testq %rsi, %rsi
+; CHECK-NEXT:    je LBB8_2
+; CHECK-NEXT:  ## %bb.1: ## %if.then
+; CHECK-NEXT:    pushq %rbx
+; CHECK-NEXT:    movq %rcx, %rbx
+; CHECK-NEXT:    movq %rsi, %rdx
+; CHECK-NEXT:    xorl %esi, %esi
+; CHECK-NEXT:    callq _memset
+; CHECK-NEXT:    movq %rbx, %rax
+; CHECK-NEXT:    popq %rbx
+; CHECK-NEXT:  LBB8_2: ## %return
+; CHECK-NEXT:    retq
+entry:
+  %cmp = icmp eq i64 %sz, 0
+  br i1 %cmp, label %return, label %if.then
+
+if.then:
+  tail call void @llvm.memset.p0.i64(ptr align 1 %arg, i8 0, i64 %sz, i1 false)
+  br label %return
+
+return:
+  %phi = phi ptr [ %ret_val_2, %if.then ], [ %ret_val_1, %entry ]
+  ret ptr %phi
+}
+
+declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg)
+declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg)
+declare noalias ptr @malloc(i64)
+declare ptr @strcpy(ptr noalias returned writeonly, ptr noalias nocapture readonly)
+declare ptr @baz(ptr, ptr)