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ef9ec8117c
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
47 lines
1.6 KiB
LLVM
47 lines
1.6 KiB
LLVM
; RUN: llc < %s | FileCheck %s
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target triple = "thumbv6---gnueabi"
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; Use STM to save the three registers
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; CHECK-LABEL: use_stm:
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; CHECK: .save {r7, lr}
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; CHECK: .setfp r7, sp
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; CHECK: stm r3!, {r0, r1, r2}
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; CHECK: bl throws_1
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define void @use_stm(i32 %a, i32 %b, i32 %c, i32* %d) local_unnamed_addr noreturn "no-frame-pointer-elim"="true" {
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entry:
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%arrayidx = getelementptr inbounds i32, i32* %d, i32 2
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store i32 %a, i32* %arrayidx, align 4
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%arrayidx1 = getelementptr inbounds i32, i32* %d, i32 3
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store i32 %b, i32* %arrayidx1, align 4
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%arrayidx2 = getelementptr inbounds i32, i32* %d, i32 4
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store i32 %c, i32* %arrayidx2, align 4
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tail call void @throws_1(i32 %a, i32 %b, i32 %c) noreturn
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unreachable
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}
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; Don't use STM: there is no available register to store
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; the address. We could transform this with some extra math, but
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; that currently isn't implemented.
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; CHECK-LABEL: no_stm:
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; CHECK: .save {r7, lr}
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; CHECK: .setfp r7, sp
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; CHECK: str r0,
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; CHECK: str r1,
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; CHECK: str r2,
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; CHECK: bl throws_2
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define void @no_stm(i32 %a, i32 %b, i32 %c, i32* %d) local_unnamed_addr noreturn "no-frame-pointer-elim"="true" {
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entry:
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%arrayidx = getelementptr inbounds i32, i32* %d, i32 2
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store i32 %a, i32* %arrayidx, align 4
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%arrayidx1 = getelementptr inbounds i32, i32* %d, i32 3
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store i32 %b, i32* %arrayidx1, align 4
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%arrayidx2 = getelementptr inbounds i32, i32* %d, i32 4
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store i32 %c, i32* %arrayidx2, align 4
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tail call void @throws_2(i32 %a, i32 %b, i32 %c, i32* %d) noreturn
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unreachable
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}
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declare void @throws_1(i32, i32, i32) noreturn
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declare void @throws_2(i32, i32, i32, i32*) noreturn
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