6c4b40def7
On PowerPC most functions require a valid TOC pointer. This is the case because either the function itself needs to use this pointer to access the TOC or because other functions that are called from that function expect a valid TOC pointer in the register R2. The main exception to this is leaf functions that do not access the TOC since they are guaranteed not to need a valid TOC pointer. This patch introduces a feature that will allow more functions to not require a valid TOC pointer in R2. Differential Revision: https://reviews.llvm.org/D73664
43 lines
1.3 KiB
LLVM
43 lines
1.3 KiB
LLVM
; RUN: llc -verify-machineinstrs -mtriple=powerpc64le-unknown-linux-gnu \
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; RUN: -mcpu=future -ppc-asm-full-reg-names < %s \
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; RUN: | FileCheck %s --check-prefix=CHECK-S
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; RUN: llc -verify-machineinstrs -mtriple=powerpc64le-unknown-linux-gnu \
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; RUN: -mcpu=future -ppc-asm-full-reg-names --filetype=obj < %s | \
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; RUN: llvm-objdump -dr - | FileCheck %s --check-prefix=CHECK-O
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; CHECK-S-LABEL: caller
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; CHECK-S: bl callee@notoc
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; CHECK-S: blr
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; CHECK-O-LABEL: caller
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; CHECK-O: bl
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; CHECK-O-NEXT: R_PPC64_REL24_NOTOC callee
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; CHECK-O: blr
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define dso_local signext i32 @caller() local_unnamed_addr {
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entry:
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%call = tail call signext i32 bitcast (i32 (...)* @callee to i32 ()*)()
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ret i32 %call
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}
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declare signext i32 @callee(...) local_unnamed_addr
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; Some calls can be considered Extrnal Symbols.
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; CHECK-S-LABEL: ExternalSymbol
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; CHECK-S: bl memcpy@notoc
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; CHECK-S: blr
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; CHECK-O-LABEL: ExternalSymbol
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; CHECK-O: bl
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; CHECK-O-NEXT: R_PPC64_REL24_NOTOC memcpy
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; CHECK-O: blr
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define dso_local void @ExternalSymbol(i8* nocapture %out, i8* nocapture readonly %in, i64 %num) local_unnamed_addr {
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entry:
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tail call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 %out, i8* align 1 %in, i64 %num, i1 false)
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ret void
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}
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declare void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nocapture writeonly, i8* noalias nocapture readonly, i64, i1 immarg)
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