r219735 - ARM: remove ARM/Thumb distinction for preferred alignment.
Tim Northover
tnorthover at apple.com
Tue Oct 14 15:12:21 PDT 2014
Author: tnorthover
Date: Tue Oct 14 17:12:21 2014
New Revision: 219735
URL: http://llvm.org/viewvc/llvm-project?rev=219735&view=rev
Log:
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.
Modified:
cfe/trunk/lib/Basic/Targets.cpp
cfe/trunk/test/CodeGen/target-data.c
Modified: cfe/trunk/lib/Basic/Targets.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Basic/Targets.cpp?rev=219735&r1=219734&r2=219735&view=diff
==============================================================================
--- cfe/trunk/lib/Basic/Targets.cpp (original)
+++ cfe/trunk/lib/Basic/Targets.cpp Tue Oct 14 17:12:21 2014
@@ -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.
}
Modified: cfe/trunk/test/CodeGen/target-data.c
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGen/target-data.c?rev=219735&r1=219734&r2=219735&view=diff
==============================================================================
--- cfe/trunk/test/CodeGen/target-data.c (original)
+++ cfe/trunk/test/CodeGen/target-data.c Tue Oct 14 17:12:21 2014
@@ -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
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