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https://github.com/c64scene-ar/llvm-6502.git
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b6bb7db62b
Looking at r225438 inspired me to see how the PowerPC backend handled the situation (calling a bitcasted TLS global), and it turns out we also produced an error (cannot select ...). What it means to "call" something that is not a function is implementation and platform specific, but in the name of doing something (besides crashing), this makes sure we do what GCC does (treat all such calls as calls through a function pointer -- meaning that the pointer is assumed, as is the convention on PPC, to point to a function descriptor structure holding the actual code address along with the function's TOC pointer and environment pointer). As GCC does, we now do the same for calling regular (non-TLS) non-function globals too. I'm not sure whether this is the most useful way to define the behavior, but at least we won't be alone. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225617 91177308-0d34-0410-b5e6-96231b3b80d8
70 lines
1.8 KiB
LLVM
70 lines
1.8 KiB
LLVM
; RUN: llc -mcpu=ppc64 < %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 = global [33 x i8] c"this is not really code, but...\0A\00", align 1
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@tls_something = 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 void @foo() #0 {
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entry:
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tail call void bitcast ([33 x i8]* @something to void ()*)() #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 void @bar() #0 {
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entry:
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tail call void bitcast (%struct.cd* @tls_something to void ()*)() #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]+]], 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 void @ext() #0 {
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entry:
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tail call void bitcast (%struct.cd* @extern_something to void ()*)() #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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