Combine allocas

tests_lit/llvm2ice_tests/fused-alloca-arg.ll

+; This is a basic test of the alloca instruction and a call.
+
+; RUN: %if --need=target_X8632 --command %p2i --filetype=obj --disassemble \
+; RUN:   --target x8632 -i %s --args -O2 -allow-externally-defined-symbols \
+; RUN:   | %if --need=target_X8632 --command FileCheck %s
+
+declare void @copy(i32 %arg1, i8* %arr1, i8* %arr2, i8* %arr3, i8* %arr4);
+
+; Test that alloca base addresses get passed correctly to functions.
+define internal void @caller1(i32 %arg) {
+entry:
+  %a1 = alloca i8, i32 32, align 4
+  %p1 = bitcast i8* %a1 to i32*
+  store i32 %arg, i32* %p1, align 1
+  call void @copy(i32 %arg, i8* %a1, i8* %a1, i8* %a1, i8* %a1)
+  ret void
+}
+
+; CHECK-LABEL:  caller1
+; CHECK-NEXT:   sub    esp,0xc
+; CHECK-NEXT:   mov    eax,DWORD PTR [esp+0x10]
+; CHECK-NEXT:   sub    esp,0x20
+; CHECK-NEXT:   mov    ecx,esp
+; CHECK-NEXT:   mov    DWORD PTR [esp],eax
+; CHECK-NEXT:   sub    esp,0x20
+; CHECK-NEXT:   mov    DWORD PTR [esp],eax
+; CHECK-NEXT:   lea    eax,[esp+0x20]
+; CHECK-NEXT:   mov    DWORD PTR [esp+0x4],eax
+; CHECK-NEXT:   lea    eax,[esp+0x20]
+; CHECK-NEXT:   mov    DWORD PTR [esp+0x8],eax
+; CHECK-NEXT:   lea    eax,[esp+0x20]
+; CHECK-NEXT:   mov    DWORD PTR [esp+0xc],eax
+; CHECK-NEXT:   lea    eax,[esp+0x20]
+; CHECK-NEXT:   mov    DWORD PTR [esp+0x10],eax
+; CHECK-NEXT:   call
+; CHECK-NEXT:   add    esp,0x20
+; CHECK-NEXT:   add    esp,0x2c
+; CHECK-NEXT:   ret
+
+; Test that alloca base addresses get passed correctly to functions.
+define internal void @caller2(i32 %arg) {
+entry:
+  %a1 = alloca i8, i32 32, align 4
+  %a2 = alloca i8, i32 32, align 4
+  %p1 = bitcast i8* %a1 to i32*
+  %p2 = bitcast i8* %a2 to i32*
+  store i32 %arg, i32* %p1, align 1
+  store i32 %arg, i32* %p2, align 1
+  call void @copy(i32 %arg, i8* %a1, i8* %a2, i8* %a1, i8* %a2)
+  ret void
+}
+
+; CHECK-LABEL:  caller2
+; CHECK-NEXT:   sub    esp,0xc
+; CHECK-NEXT:   mov    eax,DWORD PTR [esp+0x10]
+; CHECK-NEXT:   sub    esp,0x40
+; CHECK-NEXT:   mov    ecx,esp
+; CHECK-NEXT:   mov    DWORD PTR [esp],eax
+; CHECK-NEXT:   mov    DWORD PTR [esp+0x20],eax
+; CHECK-NEXT:   sub    esp,0x20
+; CHECK-NEXT:   mov    DWORD PTR [esp],eax
+; CHECK-NEXT:   lea    eax,[esp+0x20]
+; CHECK-NEXT:   mov    DWORD PTR [esp+0x4],eax
+; CHECK-NEXT:   lea    eax,[esp+0x40]
+; CHECK-NEXT:   mov    DWORD PTR [esp+0x8],eax
+; CHECK-NEXT:   lea    eax,[esp+0x20]
+; CHECK-NEXT:   mov    DWORD PTR [esp+0xc],eax
+; CHECK-NEXT:   lea    eax,[esp+0x40]
+; CHECK-NEXT:   mov    DWORD PTR [esp+0x10],eax
+; CHECK-NEXT:   call
+; CHECK-NEXT:   add    esp,0x20
+; CHECK-NEXT:   add    esp,0x4c
+; CHECK-NEXT:   ret