Imported Upstream version 5.18.0.167

Former-commit-id: 289509151e0fee68a1b591a20c9f109c3c789d3a

external/llvm/test/CodeGen/ARM/tail-call.ll

@@ -1,100 +0,0 @@
-; RUN: llc -mtriple armv7 -target-abi apcs -O0 -o - < %s \
-; RUN:   | FileCheck %s -check-prefix CHECK-TAIL -check-prefix CHECK
-; RUN: llc -mtriple armv7 -target-abi apcs -O0 -disable-tail-calls -o - < %s \
-; RUN:   | FileCheck %s -check-prefix CHECK-NO-TAIL -check-prefix CHECK
-; RUN: llc -mtriple armv7 -target-abi aapcs -O0 -o - < %s \
-; RUN:   | FileCheck %s -check-prefix CHECK-TAIL-AAPCS -check-prefix CHECK
-
-declare i32 @callee(i32 %i)
-declare extern_weak fastcc void @callee_weak()
-
-define i32 @caller(i32 %i) {
-entry:
-  %r = tail call i32 @callee(i32 %i)
-  ret i32 %r
-}
-
-; CHECK-TAIL-LABEL: caller
-; CHECK-TAIL: b callee
-
-; CHECK-NO-TAIL-LABEL: caller
-; CHECK-NO-TAIL: push {lr}
-; CHECK-NO-TAIL: bl callee
-; CHECK-NO-TAIL: pop {lr}
-; CHECK-NO-TAIL: bx lr
-
-
-; Weakly-referenced extern functions cannot be tail-called, as AAELF does
-; not define the behaviour of branch instructions to undefined weak symbols.
-define fastcc void @caller_weak() {
-; CHECK-LABEL: caller_weak:
-; CHECK: bl callee_weak
-  tail call void @callee_weak()
-  ret void
-}
-
-; A tail call can be optimized if all the arguments can be passed in registers
-; R0-R3, or the remaining arguments are already in the caller's parameter area
-; in the stack. Variadic functions are no different.
-declare i32 @variadic(i32, ...)
-
-; e.g. four integers
-define void @v_caller_ints1(i32 %a, i32 %b) {
-; CHECK-LABEL: v_caller_ints1:
-; CHECK-TAIL: b variadic
-; CHECK-TAIL-AAPCS: b variadic
-; CHECK-NO-TAIL: bl variadic
-entry:
-  %call = tail call i32 (i32, ...) @variadic(i32 %a, i32 %b, i32 %b, i32 %a)
-  ret void
-}
-
-; e.g. two 32-bit integers, one 64-bit integer (needs to span two regs)
-define void @v_caller_ints2(i32 %y, i64 %z) {
-; CHECK-LABEL: v_caller_ints2:
-; CHECK-TAIL: b variadic
-; CHECK-TAIL-AAPCS: b variadic
-; CHECK-NO-TAIL: bl variadic
-entry:
-  %call = tail call i32 (i32, ...) @variadic(i32 %y, i32 %y, i64 %z)
-  ret void
-}
-
-; e.g. two 32-bit integers, one 64-bit integer (needs to span two regs). Notice
-; that %z is passed in r1-r2 if APCS is used, contrary to AAPCS where r2-r3
-; would be used (since double-word types must start at an even register). In the
-; latter case, the third argument needs to be passed through the stack.
-define void @v_caller_ints3(i32 %y, i64 %z) {
-; CHECK-LABEL: v_caller_ints3:
-; CHECK-TAIL: b variadic
-; CHECK-TAIL-AAPCS: bl variadic
-; CHECK-NO-TAIL: bl variadic
-entry:
-  %call = tail call i32 (i32, ...) @variadic(i32 %y, i64 %z, i32 %y)
-  ret void
-}
-
-; e.g. two 32-bit integers, one 64-bit integer and another 64-bit integer that
-; doesn't fit in r0-r3 but comes from the caller argument list and is in the
-; same position.
-define void @v_caller_ints4(i64 %a, i32 %b, i32 %c, i64 %d) {
-; CHECK-LABEL: v_caller_ints4:
-; CHECK-TAIL: b variadic
-; CHECK-TAIL-AAPCS: b variadic
-; CHECK-NO-TAIL: bl variadic
-entry:
-  %call = tail call i32 (i32, ...) @variadic(i32 %b, i32 %c, i64 %a, i64 %d)
-  ret void
-}
-
-; If the arguments do not fit in r0-r3 and the existing parameters cannot be
-; taken from the caller's parameter region, the optimization is not supported.
-
-; e.g. one 32-bit integer, two 64-bit integers
-define void @v_caller_ints_fail(i32 %y, i64 %z) {
-; CHECK-LABEL: v_caller_ints_fail:
-; CHECK: bl variadic
-entry:
-  %call = tail call i32 (i32, ...) @variadic(i32 %y, i64 %z, i64 %z)
-  ret void
-}