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llvm-project/llvm/test/CodeGen/Thumb/stm-scavenging.ll

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[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
2018-02-07 07:00:17 +08:00
; RUN: llc < %s | FileCheck %s
target triple = "thumbv6---gnueabi"
; Use STM to save the three registers
; CHECK-LABEL: use_stm:
; CHECK: .save {r7, lr}
; CHECK: .setfp r7, sp
; CHECK: stm r3!, {r0, r1, r2}
; CHECK: bl throws_1
define void @use_stm(i32 %a, i32 %b, i32 %c, i32* %d) local_unnamed_addr noreturn "no-frame-pointer-elim"="true" {
entry:
%arrayidx = getelementptr inbounds i32, i32* %d, i32 2
store i32 %a, i32* %arrayidx, align 4
%arrayidx1 = getelementptr inbounds i32, i32* %d, i32 3
store i32 %b, i32* %arrayidx1, align 4
%arrayidx2 = getelementptr inbounds i32, i32* %d, i32 4
store i32 %c, i32* %arrayidx2, align 4
tail call void @throws_1(i32 %a, i32 %b, i32 %c) noreturn
unreachable
}
; Don't use STM: there is no available register to store
; the address. We could transform this with some extra math, but
; that currently isn't implemented.
; CHECK-LABEL: no_stm:
; CHECK: .save {r7, lr}
; CHECK: .setfp r7, sp
; CHECK: str r0,
; CHECK: str r1,
; CHECK: str r2,
; CHECK: bl throws_2
define void @no_stm(i32 %a, i32 %b, i32 %c, i32* %d) local_unnamed_addr noreturn "no-frame-pointer-elim"="true" {
entry:
%arrayidx = getelementptr inbounds i32, i32* %d, i32 2
store i32 %a, i32* %arrayidx, align 4
%arrayidx1 = getelementptr inbounds i32, i32* %d, i32 3
store i32 %b, i32* %arrayidx1, align 4
%arrayidx2 = getelementptr inbounds i32, i32* %d, i32 4
store i32 %c, i32* %arrayidx2, align 4
tail call void @throws_2(i32 %a, i32 %b, i32 %c, i32* %d) noreturn
unreachable
}
declare void @throws_1(i32, i32, i32) noreturn
declare void @throws_2(i32, i32, i32, i32*) noreturn