From 94670e82be07cdfe605f9391bf96acd3edb3a05e Mon Sep 17 00:00:00 2001 From: Petar Jovanovic Date: Tue, 9 May 2017 16:24:03 +0000 Subject: [PATCH] [mips] Impose a threshold for coercion of aggregates Modified MipsABIInfo::classifyArgumentType so that it now coerces aggregate structures only if the size of said aggregate is less than 16/64 bytes, depending on the ABI. Patch by Stefan Maksimovic. Differential Revision: https://reviews.llvm.org/D32900 git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@302547 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/TargetInfo.cpp | 8 +++++++ test/CodeGen/mips-aggregate-arg.c | 38 +++++++++++++++++++++++++++++++ 2 files changed, 46 insertions(+) create mode 100644 test/CodeGen/mips-aggregate-arg.c diff --git a/lib/CodeGen/TargetInfo.cpp b/lib/CodeGen/TargetInfo.cpp index 4ebbef7dfb..5d3ccb86ff 100644 --- a/lib/CodeGen/TargetInfo.cpp +++ b/lib/CodeGen/TargetInfo.cpp @@ -6695,6 +6695,14 @@ MipsABIInfo::classifyArgumentType(QualType Ty, uint64_t &Offset) const { return getNaturalAlignIndirect(Ty, RAA == CGCXXABI::RAA_DirectInMemory); } + // Use indirect if the aggregate cannot fit into registers for + // passing arguments according to the ABI + unsigned Threshold = IsO32 ? 16 : 64; + + if(getContext().getTypeSizeInChars(Ty) > CharUnits::fromQuantity(Threshold)) + return ABIArgInfo::getIndirect(CharUnits::fromQuantity(Align), true, + getContext().getTypeAlign(Ty) / 8 > Align); + // If we have reached here, aggregates are passed directly by coercing to // another structure type. Padding is inserted if the offset of the // aggregate is unaligned. diff --git a/test/CodeGen/mips-aggregate-arg.c b/test/CodeGen/mips-aggregate-arg.c new file mode 100644 index 0000000000..b0be458ec6 --- /dev/null +++ b/test/CodeGen/mips-aggregate-arg.c @@ -0,0 +1,38 @@ +// RUN: %clang_cc1 -triple mipsel-unknown-linux-gnu -S -emit-llvm -o - %s | FileCheck -check-prefix=O32 %s +// RUN: %clang_cc1 -triple mips64el-unknown-linux-gnu -S -emit-llvm -o - %s -target-abi n32 | FileCheck -check-prefix=N32-N64 %s +// RUN: %clang_cc1 -triple mips64el-unknown-linux-gnu -S -emit-llvm -o - %s -target-abi n64 | FileCheck -check-prefix=N32-N64 %s + +struct t1 { + char t1[10]; +}; + +struct t2 { + char t2[20]; +}; + +struct t3 { + char t3[65]; +}; + +extern struct t1 g1; +extern struct t2 g2; +extern struct t3 g3; +extern void f1(struct t1); +extern void f2(struct t2); +extern void f3(struct t3); + +void f() { + +// O32: call void @f1(i32 inreg %3, i32 inreg %5, i16 inreg %7) +// O32: call void @f2(%struct.t2* byval align 4 %tmp) +// O32: call void @f3(%struct.t3* byval align 4 %tmp1) + +// N32-N64: call void @f1(i64 inreg %3, i16 inreg %5) +// N32-N64: call void @f2(i64 inreg %9, i64 inreg %11, i32 inreg %13) +// N32-N64: call void @f3(%struct.t3* byval align 8 %tmp) + + f1(g1); + f2(g2); + f3(g3); +} + -- 2.40.0