From: Tim Northover Date: Tue, 14 Oct 2014 22:12:21 +0000 (+0000) Subject: ARM: remove ARM/Thumb distinction for preferred alignment. X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=0e9cdfcf37ff87585ee9160c9c5da7935063f907;p=clang ARM: remove ARM/Thumb distinction for preferred alignment. Thumb1 has legitimate reasons for preferring 32-bit alignment of types i1/i8/i16, since the 16-bit encoding of "add rD, sp, #imm" requires #imm to be a multiple of 4. However, this is a trade-off betweem code size and RAM usage; the DataLayout string is not the best place to represent it even if desired. So this patch removes the extra Thumb requirements, hopefully making ARM and Thumb completely compatible in this respect. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@219735 91177308-0d34-0410-b5e6-96231b3b80d8 --- diff --git a/lib/Basic/Targets.cpp b/lib/Basic/Targets.cpp index 0ed96eb693..0ca45c9c4c 100644 --- a/lib/Basic/Targets.cpp +++ b/lib/Basic/Targets.cpp @@ -3728,42 +3728,27 @@ class ARMTargetInfo : public TargetInfo { ZeroLengthBitfieldBoundary = 0; - if (IsThumb) { - // Thumb1 add sp, #imm requires the immediate value be multiple of 4, - // so set preferred for small types to 32. - if (T.isOSBinFormatMachO()) { - DescriptionString = BigEndian ? - "E-m:o-p:32:32-i1:8:32-i8:8:32-i16:16:32-i64:64-" - "v128:64:128-a:0:32-n32-S64" : - "e-m:o-p:32:32-i1:8:32-i8:8:32-i16:16:32-i64:64-" - "v128:64:128-a:0:32-n32-S64"; - } else if (T.isOSWindows()) { - // FIXME: this is invalid for WindowsCE - assert(!BigEndian && "Windows on ARM does not support big endian"); - DescriptionString = "e" - "-m:e" - "-p:32:32" - "-i1:8:32-i8:8:32-i16:16:32-i64:64" - "-v128:64:128" - "-a:0:32" - "-n32" - "-S64"; - } else { - DescriptionString = BigEndian ? - "E-m:e-p:32:32-i1:8:32-i8:8:32-i16:16:32-i64:64-" - "v128:64:128-a:0:32-n32-S64" : - "e-m:e-p:32:32-i1:8:32-i8:8:32-i16:16:32-i64:64-" - "v128:64:128-a:0:32-n32-S64"; - } + // Thumb1 add sp, #imm requires the immediate value be multiple of 4, + // so set preferred for small types to 32. + if (T.isOSBinFormatMachO()) { + DescriptionString = + BigEndian ? "E-m:o-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64" + : "e-m:o-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"; + } else if (T.isOSWindows()) { + // FIXME: this is invalid for WindowsCE + assert(!BigEndian && "Windows on ARM does not support big endian"); + DescriptionString = "e" + "-m:e" + "-p:32:32" + "-i64:64" + "-v128:64:128" + "-a:0:32" + "-n32" + "-S64"; } else { - if (T.isOSBinFormatMachO()) - DescriptionString = - BigEndian ? "E-m:o-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64" - : "e-m:o-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"; - else - DescriptionString = - BigEndian ? "E-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64" - : "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"; + DescriptionString = + BigEndian ? "E-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64" + : "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"; } // FIXME: Enumerated types are variable width in straight AAPCS. @@ -3794,31 +3779,16 @@ class ARMTargetInfo : public TargetInfo { /// gcc. ZeroLengthBitfieldBoundary = 32; - if (IsThumb) { - // Thumb1 add sp, #imm requires the immediate value be multiple of 4, - // so set preferred for small types to 32. - if (T.isOSBinFormatMachO()) - DescriptionString = BigEndian ? - "E-m:o-p:32:32-i1:8:32-i8:8:32-i16:16:32-f64:32:64" - "-v64:32:64-v128:32:128-a:0:32-n32-S32" : - "e-m:o-p:32:32-i1:8:32-i8:8:32-i16:16:32-f64:32:64" - "-v64:32:64-v128:32:128-a:0:32-n32-S32"; - else - DescriptionString = BigEndian ? - "E-m:e-p:32:32-i1:8:32-i8:8:32-i16:16:32-f64:32:64" - "-v64:32:64-v128:32:128-a:0:32-n32-S32" : - "e-m:e-p:32:32-i1:8:32-i8:8:32-i16:16:32-f64:32:64" - "-v64:32:64-v128:32:128-a:0:32-n32-S32"; - } else { - if (T.isOSBinFormatMachO()) - DescriptionString = BigEndian ? - "E-m:o-p:32:32-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32" : - "e-m:o-p:32:32-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32"; - else - DescriptionString = BigEndian ? - "E-m:e-p:32:32-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32" : - "e-m:e-p:32:32-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32"; - } + if (T.isOSBinFormatMachO()) + DescriptionString = + BigEndian + ? "E-m:o-p:32:32-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32" + : "e-m:o-p:32:32-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32"; + else + DescriptionString = + BigEndian + ? "E-m:e-p:32:32-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32" + : "e-m:e-p:32:32-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32"; // FIXME: Override "preferred align" for double and long long. } diff --git a/test/CodeGen/target-data.c b/test/CodeGen/target-data.c index ab27a65c57..a727a7f6da 100644 --- a/test/CodeGen/target-data.c +++ b/test/CodeGen/target-data.c @@ -128,7 +128,7 @@ // RUN: %clang_cc1 -triple thumb-unknown-gnueabi -o - -emit-llvm %s | \ // RUN: FileCheck %s -check-prefix=THUMB -// THUMB: target datalayout = "e-m:e-p:32:32-i1:8:32-i8:8:32-i16:16:32-i64:64-v128:64:128-a:0:32-n32-S64" +// THUMB: target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64" // RUN: %clang_cc1 -triple arm-unknown-gnueabi -o - -emit-llvm %s | \ // RUN: FileCheck %s -check-prefix=ARM @@ -136,7 +136,7 @@ // RUN: %clang_cc1 -triple thumb-unknown -o - -emit-llvm -target-abi apcs-gnu \ // RUN: %s | FileCheck %s -check-prefix=THUMB-GNU -// THUMB-GNU: target datalayout = "e-m:e-p:32:32-i1:8:32-i8:8:32-i16:16:32-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32" +// THUMB-GNU: target datalayout = "e-m:e-p:32:32-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32" // RUN: %clang_cc1 -triple arm-unknown -o - -emit-llvm -target-abi apcs-gnu \ // RUN: %s | FileCheck %s -check-prefix=ARM-GNU