4e2b4f97a0
Allow shrink-wrapping past memory accesses that only access globals or function arguments. This patch uses getUnderlyingObject to try to identify the accessed object by a given memory operand. If it is a global or an argument, it does not access the stack of the current function and should not block shrink wrapping. Note that the caller's stack may get accessed when passing an argument via the stack, but not the stack of the current function. This addresses part of the TODO from D63152. Reviewed By: thegameg Differential Revision: https://reviews.llvm.org/D149668
47 lines
2.1 KiB
LLVM
47 lines
2.1 KiB
LLVM
; RUN: llc -relocation-model=static -verify-machineinstrs < %s -mtriple=powerpc64-unknown-linux-gnu -disable-ppc-sco=false --enable-shrink-wrap=false | FileCheck %s -check-prefix=CHECK-SCO-ONLY
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; RUN: llc -relocation-model=static -verify-machineinstrs < %s -mtriple=powerpc64-unknown-linux-gnu -disable-ppc-sco=false --enable-shrink-wrap=true | FileCheck %s -check-prefix=CHECK-SCO-SR
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; RUN: llc -relocation-model=static -verify-machineinstrs < %s -mtriple=powerpc64le-unknown-linux-gnu -disable-ppc-sco=false --enable-shrink-wrap=false | FileCheck %s -check-prefix=CHECK-SCO-ONLY
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; RUN: llc -relocation-model=static -verify-machineinstrs < %s -mtriple=powerpc64le-unknown-linux-gnu -disable-ppc-sco=false --enable-shrink-wrap=true | FileCheck %s -check-prefix=CHECK-SCO-SR
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; RUN: not --crash llc -relocation-model=pic -verify-machineinstrs < %s -mtriple=powerpc64-ibm-aix-xcoff -tailcallopt -disable-ppc-sco=false --enable-shrink-wrap=true 2>&1 | FileCheck %s -check-prefix=CHECK-AIX
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;; The above RUN command is expected to fail on AIX since tail calling is not implemented ATM
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%"class.clang::NamedDecl" = type { i32 }
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declare void @__assert_fail();
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define dso_local i8 @_ZNK5clang9NamedDecl23getLinkageAndVisibilityEv(
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ptr %this) {
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entry:
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%tobool = icmp eq ptr %this, null
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br i1 %tobool, label %cond.false, label %exit
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cond.false:
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tail call void @__assert_fail()
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unreachable
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exit:
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%bf.load = load i32, ptr %this, align 4
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%call.i = tail call i8 @LVComputationKind(
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ptr %this,
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i32 %bf.load)
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ret i8 %call.i
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; CHECK-SCO-ONLY-LABEL: _ZNK5clang9NamedDecl23getLinkageAndVisibilityEv:
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; CHECK-SCO-ONLY: stdu 1, -{{[0-9]+}}(1)
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; CHECK-SCO-ONLY: b LVComputationKind
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; CHECK-SCO-ONLY: #TC_RETURNd8
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; CHECK-SCO-ONLY: bl __assert_fail
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;
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; CHECK-SCO-SR-LABEL: _ZNK5clang9NamedDecl23getLinkageAndVisibilityEv:
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; CHECK-SCO-SR: b LVComputationKind
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; CHECK-SCO-SR: #TC_RETURNd8
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; CHECK-SCO-SR: stdu 1, -{{[0-9]+}}(1)
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; CHECK-SCO-SR: bl __assert_fail
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; CHECK-AIX: LLVM ERROR: Tail call support is unimplemented on AIX.
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}
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define dso_local fastcc i8 @LVComputationKind(
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ptr %D,
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i32 %computation) {
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ret i8 0
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}
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