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ae0244420d
Summary: Specifying X[8-15,18] registers as callee-saved is used to support CONFIG_ARM64_LSE_ATOMICS in Linux kernel. As part of this patch we: - use custom CSR list/mask when user specifies custom CSRs - update Machine Register Info's list of CSRs with additional custom CSRs in LowerCall and LowerFormalArguments. Reviewers: srhines, nickdesaulniers, efriedma, javed.absar Reviewed By: nickdesaulniers Subscribers: kristof.beyls, jfb, llvm-commits Differential Revision: https://reviews.llvm.org/D52216 llvm-svn: 342824
29 lines
835 B
LLVM
29 lines
835 B
LLVM
; RUN: llc -mtriple=arm64-linux-gnu -mattr=+reserve-x18 -mattr=+call-saved-x18 \
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; RUN: -o - %s | FileCheck %s
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; RUN: llc -mtriple=arm64-linux-gnu -mattr=+reserve-x18 -mattr=+call-saved-x18 \
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; RUN: -global-isel \
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; RUN: -o - %s | FileCheck %s
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; RUN: llc -mtriple=arm64-linux-gnu -mattr=+reserve-x18 -mattr=+call-saved-x18 \
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; RUN: -fast-isel \
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; RUN: -o - %s | FileCheck %s
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; Used to exhaust the supply of GPRs.
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@var = global [30 x i64] zeroinitializer
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; If a register is specified to be both reserved and callee-saved, then it
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; should not be allocated and should not be spilled onto the stack.
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define void @foo() {
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; CHECK-NOT: str x18, [sp
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%val = load volatile [30 x i64], [30 x i64]* @var
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store volatile [30 x i64] %val, [30 x i64]* @var
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; CHECK-NOT: ldr x18
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; CHECK-NOT: str x18
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; CHECK-NOT: ldr x18, [sp
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ret void
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}
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