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This patch makes medium code model the default for 64-bit PowerPC ELF. 

When the CodeGenInfo is to be created for the PPC64 target machine,
a default code-model selection is converted to CodeModel::Medium
provided we are not targeting the Darwin OS.  Defaults for Darwin
are unaffected.

llvm-svn: 168747
This commit is contained in:
Bill Schmidt 2012-11-27 23:36:26 +00:00
parent 948d4aba5d
commit e0a68a562b
2 changed files with 31 additions and 0 deletions
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5
llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCTargetDesc.cpp
View File

@ -88,6 +88,11 @@ static MCCodeGenInfo *createPPCMCCodeGenInfo(StringRef TT, Reloc::Model RM,
else
RM = Reloc::Static;
}
if (CM == CodeModel::Default) {
Triple T(TT);
if (!T.isOSDarwin() && T.getArch() == Triple::ppc64)
CM = CodeModel::Medium;
}
X->InitMCCodeGenInfo(RM, CM, OL);
return X;
}

26
llvm/test/CodeGen/PowerPC/mcm-default.ll Normal file
View File

@ -0,0 +1,26 @@
; RUN: llc -mcpu=pwr7 -O0 <%s | FileCheck %s
; Test that we generate code for the medium model as the default.
; Use an external variable reference as an example.
target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-f128:128:128-v128:128:128-n32:64"
target triple = "powerpc64-unknown-linux-gnu"
@ei = external global i32
define signext i32 @test_external() nounwind {
entry:
%0 = load i32* @ei, align 4
%inc = add nsw i32 %0, 1
store i32 %inc, i32* @ei, align 4
ret i32 %0
}
; CHECK: test_external:
; CHECK: addis [[REG1:[0-9]+]], 2, .LC[[TOCNUM:[0-9]+]]@toc@ha
; CHECK: ld [[REG2:[0-9]+]], .LC[[TOCNUM]]@toc@l([[REG1]])
; CHECK: lwz {{[0-9]+}}, 0([[REG2]])
; CHECK: stw {{[0-9]+}}, 0([[REG2]])
; CHECK: .section .toc
; CHECK: .LC[[TOCNUM]]:
; CHECK: .tc {{[a-z0-9A-Z_.]+}}[TC],{{[a-z0-9A-Z_.]+}}