3f46e5453d
This patch utilizes the -maix-small-local-exec-tls option added in D155544 to produce a faster access sequence for the local-exec TLS model, where loading from the TOC can be avoided. The patch either produces an addi/la with a displacement off of r13 (the thread pointer) when the address is calculated, or it produces an addi/la followed by a load/store when the address is calculated and used for further accesses. This patch also optimizes this sequence a bit more where we can remove the addi/la when the load/store offset is 0. A follow up patch will be posted to account for when the load/store offset is non-zero, and currently in these situations we keep the addi/la that precedes the load/store. Furthermore, this access sequence is only performed for TLS variables that are less than ~32KB in size. Differential Revision: https://reviews.llvm.org/D155600
70 lines
1.9 KiB
LLVM
70 lines
1.9 KiB
LLVM
; RUN: llc -relocation-model=static -verify-machineinstrs -mcpu=pwr7 < %s | FileCheck %s
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target datalayout = "E-m:e-i64:64-n32:64"
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target triple = "powerpc64-unknown-linux-gnu"
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%struct.cd = type { i64, i64, i64 }
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@something = dso_local global [33 x i8] c"this is not really code, but...\0A\00", align 1
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@tls_something = dso_local thread_local global %struct.cd zeroinitializer, align 8
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@extern_something = external global %struct.cd
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; Function Attrs: nounwind
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define dso_local void @foo() #0 {
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entry:
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tail call void @something() #0
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ret void
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; CHECK-LABEL: @foo
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; CHECK-DAG: addis [[REG1:[0-9]+]], 2, something@toc@ha
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; CHECK-DAG: std 2, 40(1)
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; CHECK-DAG: addi [[REG3:[0-9]+]], [[REG1]], something@toc@l
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; CHECK-DAG: ld [[REG2:[0-9]+]], 0([[REG3]])
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; CHECK-DAG: ld 11, 16([[REG3]])
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; CHECK-DAG: ld 2, 8([[REG3]])
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; CHECK-DAG: mtctr [[REG2]]
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; CHECK: bctrl
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; CHECK: ld 2, 40(1)
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; CHECK: blr
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}
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; Function Attrs: nounwind
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define dso_local void @bar() #0 {
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entry:
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tail call void @tls_something() #0
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ret void
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; CHECK-LABEL: @bar
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; CHECK-DAG: addis [[REG1:[0-9]+]], 13, tls_something@tprel@ha
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; CHECK-DAG: std 2, 40(1)
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; CHECK-DAG: addi [[REG3:[0-9]+]], [[REG1]], tls_something@tprel@l
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; CHECK-DAG: ld [[REG2:[0-9]+]], tls_something@tprel@l([[REG1]])
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; CHECK-DAG: ld 11, 16([[REG3]])
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; CHECK-DAG: ld 2, 8([[REG3]])
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; CHECK-DAG: mtctr [[REG2]]
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; CHECK: bctrl
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; CHECK: ld 2, 40(1)
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; CHECK: blr
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}
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; Function Attrs: nounwind
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define dso_local void @ext() #0 {
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entry:
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tail call void @extern_something() #0
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ret void
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; CHECK-LABEL: @ext
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; CHECK-DAG: addis [[REG1:[0-9]+]], 2, [[NAME:[._A-Za-z0-9]+]]@toc@ha
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; CHECK-DAG: std 2, 40(1)
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; CHECK-DAG: ld [[REG3:[0-9]+]], [[NAME]]@toc@l(3)
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; CHECK-DAG: ld [[REG2:[0-9]+]], 0([[REG3]])
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; CHECK-DAG: ld 11, 16([[REG3]])
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; CHECK-DAG: ld 2, 8([[REG3]])
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; CHECK-DAG: mtctr [[REG2]]
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; CHECK: bctrl
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; CHECK: ld 2, 40(1)
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; CHECK: blr
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}
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attributes #0 = { nounwind }
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