| Eric Christopher | 661f2d1 | 2014-12-18 02:20:58 +0000 | [diff] [blame^] | 1 | ; RUN: llc -mtriple armv7 -target-abi apcs -O0 -o - < %s \ |
| Eric Christopher | 1971c35 | 2014-12-18 02:08:45 +0000 | [diff] [blame] | 2 | ; RUN: | FileCheck %s -check-prefix CHECK-TAIL |
| Eric Christopher | 661f2d1 | 2014-12-18 02:20:58 +0000 | [diff] [blame^] | 3 | ; RUN: llc -mtriple armv7 -target-abi apcs -O0 -disable-tail-calls -o - < %s \ |
| Saleem Abdulrasool | 0d96f3d | 2014-03-11 15:09:54 +0000 | [diff] [blame] | 4 | ; RUN: | FileCheck %s -check-prefix CHECK-NO-TAIL |
| 5 | |
| 6 | declare i32 @callee(i32 %i) |
| Oliver Stannard | 12993dd | 2014-08-18 12:42:15 +0000 | [diff] [blame] | 7 | declare extern_weak fastcc void @callee_weak() |
| Saleem Abdulrasool | 0d96f3d | 2014-03-11 15:09:54 +0000 | [diff] [blame] | 8 | |
| 9 | define i32 @caller(i32 %i) { |
| 10 | entry: |
| 11 | %r = tail call i32 @callee(i32 %i) |
| 12 | ret i32 %r |
| 13 | } |
| 14 | |
| Saleem Abdulrasool | 1425622 | 2014-03-25 03:39:39 +0000 | [diff] [blame] | 15 | ; CHECK-TAIL-LABEL: caller |
| Saleem Abdulrasool | 0d96f3d | 2014-03-11 15:09:54 +0000 | [diff] [blame] | 16 | ; CHECK-TAIL: b callee |
| 17 | |
| Saleem Abdulrasool | 1425622 | 2014-03-25 03:39:39 +0000 | [diff] [blame] | 18 | ; CHECK-NO-TAIL-LABEL: caller |
| Saleem Abdulrasool | 0d96f3d | 2014-03-11 15:09:54 +0000 | [diff] [blame] | 19 | ; CHECK-NO-TAIL: push {lr} |
| 20 | ; CHECK-NO-TAIL: bl callee |
| 21 | ; CHECK-NO-TAIL: pop {lr} |
| 22 | ; CHECK-NO-TAIL: bx lr |
| 23 | |
| Oliver Stannard | 12993dd | 2014-08-18 12:42:15 +0000 | [diff] [blame] | 24 | |
| 25 | ; Weakly-referenced extern functions cannot be tail-called, as AAELF does |
| 26 | ; not define the behaviour of branch instructions to undefined weak symbols. |
| 27 | define fastcc void @caller_weak() { |
| 28 | ; CHECK-LABEL: caller_weak: |
| 29 | ; CHECK: bl callee_weak |
| 30 | tail call void @callee_weak() |
| 31 | ret void |
| 32 | } |