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llvm-mirror/test/CodeGen/ARM/pr25838.ll
Eli Friedman ef9ec8117c [LivePhysRegs] Fix handling of return instructions.
See D42509 for the original version of this.

Basically, there are two significant changes to behavior here:

- addLiveOuts always adds all pristine registers (even if a block has
no successors).
- addLiveOuts and addLiveOutsNoPristines always add all callee-saved
registers for return blocks (including conditional return blocks).

I cleaned up the functions a bit to make it clear these properties hold.

Differential Revision: https://reviews.llvm.org/D42655

llvm-svn: 324422
2018-02-06 23:00:17 +00:00

35 lines
618 B
LLVM

; RUN: llc -verify-machineinstrs < %s
; PR25838
target triple = "armv7--linux-android"
%0 = type { i32, i32 }
define i32 @foo(%0* readonly) {
br i1 undef, label %12, label %2
; <label>:2
%3 = trunc i64 undef to i32
%4 = icmp eq i32 undef, 0
br i1 %4, label %5, label %9
; <label>:5
%6 = icmp slt i32 %3, 0
%7 = sub nsw i32 0, %3
%8 = select i1 %6, i32 %7, i32 %3
br label %12
; <label>:9
br i1 undef, label %12, label %10
; <label>:10
%11 = tail call i32 @bar(i32 undef)
unreachable
; <label>:12
%13 = phi i32 [ %8, %5 ], [ 0, %1 ], [ undef, %9 ]
ret i32 %13
}
declare i32 @bar(i32)