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Split up switch.S and save_restore_d8_d15.S to follow one function per file convention. 

llvm-svn: 93815
This commit is contained in:
Daniel Dunbar 2010-01-19 00:01:10 +00:00
parent 889ce76f41
commit 4c43c2bc73
7 changed files with 211 additions and 101 deletions
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19
compiler-rt/lib/arm/save_restore_d8_d15.S → compiler-rt/lib/arm/restore_vfp_d8_d15_regs.S
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@ -11,25 +11,16 @@
//
// When compiling C++ functions that need to handle thrown exceptions the
// compiler is required to save all registers and call __Unwind_SjLj_Register
// in the function prolog. But when compiling for thumb1, there are
// compiler is required to save all registers and call __Unwind_SjLj_Register
// in the function prolog. But when compiling for thumb1, there are
// no instructions to access the floating point registers, so the
// compiler needs to add a call to the helper function _save_vfp_d8_d15_regs
// written in ARM to save the float registers. In the epilog, the compiler
// written in ARM to save the float registers. In the epilog, the compiler
// must also add a call to __restore_vfp_d8_d15_regs to restore those registers.
//
.text
.syntax unified
//
// Save registers d8-d15 onto stack
//
DEFINE_COMPILERRT_PRIVATE_FUNCTION(__save_vfp_d8_d15_regs)
vstmdb sp!, {d8-d15} // push registers d8-d15 onto stack
bx lr // return to prolog
.syntax unified
//
// Restore registers d8-d15 from stack
@ -42,4 +33,4 @@ DEFINE_COMPILERRT_PRIVATE_FUNCTION(__restore_vfp_d8_d15_regs)
// tell linker it can break up file at label boundaries
.subsections_via_symbols

34
compiler-rt/lib/arm/save_vfp_d8_d15_regs.S Normal file
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@ -0,0 +1,34 @@
//===-- save_restore_regs.S - Implement save/restore* ---------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "../assembly.h"
//
// When compiling C++ functions that need to handle thrown exceptions the
// compiler is required to save all registers and call __Unwind_SjLj_Register
// in the function prolog. But when compiling for thumb1, there are
// no instructions to access the floating point registers, so the
// compiler needs to add a call to the helper function _save_vfp_d8_d15_regs
// written in ARM to save the float registers. In the epilog, the compiler
// must also add a call to __restore_vfp_d8_d15_regs to restore those registers.
//
.text
.syntax unified
//
// Save registers d8-d15 onto stack
//
DEFINE_COMPILERRT_PRIVATE_FUNCTION(__save_vfp_d8_d15_regs)
vstmdb sp!, {d8-d15} // push registers d8-d15 onto stack
bx lr // return to prolog
// tell linker it can break up file at label boundaries
.subsections_via_symbols

87
compiler-rt/lib/arm/switch.S
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@ -1,87 +0,0 @@
//===-- switch.S - Implement switch* --------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "../assembly.h"
//
// When compiling switch statements in thumb mode, the compiler
// can use these __switch* helper functions The compiler emits a blx to
// the __switch* function followed by a table of displacements for each
// case statement. On entry, R0 is the index into the table. The __switch*
// function uses the return address in lr to find the start of the table.
// The first entry in the table is the count of the entries in the table.
// It then uses R0 to index into the table and get the displacement of the
// address to jump to. If R0 is greater than the size of the table, it jumps
// to the last entry in the table. Each displacement in the table is actually
// the distance from lr to the label, thus making the tables PIC.
.text
.syntax unified
//
// The table contains unsigned byte sized elements which are 1/2 the distance
// from lr to the target label.
//
DEFINE_COMPILERRT_PRIVATE_FUNCTION(__switchu8)
ldrb ip, [lr, #-1] // get first byte in table
cmp r0, ip // compare with index
ldrbcc r0, [lr, r0] // get indexed byte out of table
ldrbhs r0, [lr, ip] // if out of range, use last entry in table
add ip, lr, r0, lsl #1 // compute label = lr + element*2
bx ip // jump to computed label
//
// The table contains signed byte sized elements which are 1/2 the distance
// from lr to the target label.
//
DEFINE_COMPILERRT_PRIVATE_FUNCTION(__switch8)
ldrb ip, [lr, #-1] // get first byte in table
cmp r0, ip // signed compare with index
ldrsbcc r0, [lr, r0] // get indexed byte out of table
ldrsbhs r0, [lr, ip] // if out of range, use last entry in table
add ip, lr, r0, lsl #1 // compute label = lr + element*2
bx ip // jump to computed label
//
// The table contains signed 2-byte sized elements which are 1/2 the distance
// from lr to the target label.
//
DEFINE_COMPILERRT_PRIVATE_FUNCTION(__switch16)
ldrh ip, [lr, #-1] // get first 16-bit word in table
cmp r0, ip // compare with index
add r0, lr, r0, lsl #1 // compute address of element in table
ldrshcc r0, [r0, #1] // load 16-bit element if r0 is in range
add ip, lr, ip, lsl #1 // compute address of last element in table
ldrshhs r0, [ip, #1] // load 16-bit element if r0 out of range
add ip, lr, r0, lsl #1 // compute label = lr + element*2
bx ip // jump to computed label
//
// The table contains signed 4-byte sized elements which are the distance
// from lr to the target label.
//
DEFINE_COMPILERRT_PRIVATE_FUNCTION(__switch32)
ldr ip, [lr, #-1] // get first 32-bit word in table
cmp r0, ip // compare with index
add r0, lr, r0, lsl #2 // compute address of element in table
ldrcc r0, [r0, #3] // load 32-bit element if r0 is in range
add ip, lr, ip, lsl #2 // compute address of last element in table
ldrcs r0, [ip, #3] // load 32-bit element if r0 out of range
add ip, lr, r0 // compute label = lr + element
bx ip // jump to computed label
// tell linker it can break up file at label boundaries
.subsections_via_symbols

43
compiler-rt/lib/arm/switch16.S Normal file
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@ -0,0 +1,43 @@
//===-- switch.S - Implement switch* --------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "../assembly.h"
//
// When compiling switch statements in thumb mode, the compiler
// can use these __switch* helper functions The compiler emits a blx to
// the __switch* function followed by a table of displacements for each
// case statement. On entry, R0 is the index into the table. The __switch*
// function uses the return address in lr to find the start of the table.
// The first entry in the table is the count of the entries in the table.
// It then uses R0 to index into the table and get the displacement of the
// address to jump to. If R0 is greater than the size of the table, it jumps
// to the last entry in the table. Each displacement in the table is actually
// the distance from lr to the label, thus making the tables PIC.
.text
.syntax unified
//
// The table contains signed 2-byte sized elements which are 1/2 the distance
// from lr to the target label.
//
DEFINE_COMPILERRT_PRIVATE_FUNCTION(__switch16)
ldrh ip, [lr, #-1] // get first 16-bit word in table
cmp r0, ip // compare with index
add r0, lr, r0, lsl #1 // compute address of element in table
ldrshcc r0, [r0, #1] // load 16-bit element if r0 is in range
add ip, lr, ip, lsl #1 // compute address of last element in table
ldrshhs r0, [ip, #1] // load 16-bit element if r0 out of range
add ip, lr, r0, lsl #1 // compute label = lr + element*2
bx ip // jump to computed label
// tell linker it can break up file at label boundaries
.subsections_via_symbols

45
compiler-rt/lib/arm/switch32.S Normal file
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@ -0,0 +1,45 @@
//===-- switch.S - Implement switch* --------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "../assembly.h"
//
// When compiling switch statements in thumb mode, the compiler
// can use these __switch* helper functions The compiler emits a blx to
// the __switch* function followed by a table of displacements for each
// case statement. On entry, R0 is the index into the table. The __switch*
// function uses the return address in lr to find the start of the table.
// The first entry in the table is the count of the entries in the table.
// It then uses R0 to index into the table and get the displacement of the
// address to jump to. If R0 is greater than the size of the table, it jumps
// to the last entry in the table. Each displacement in the table is actually
// the distance from lr to the label, thus making the tables PIC.
.text
.syntax unified
//
// The table contains signed 4-byte sized elements which are the distance
// from lr to the target label.
//
DEFINE_COMPILERRT_PRIVATE_FUNCTION(__switch32)
ldr ip, [lr, #-1] // get first 32-bit word in table
cmp r0, ip // compare with index
add r0, lr, r0, lsl #2 // compute address of element in table
ldrcc r0, [r0, #3] // load 32-bit element if r0 is in range
add ip, lr, ip, lsl #2 // compute address of last element in table
ldrcs r0, [ip, #3] // load 32-bit element if r0 out of range
add ip, lr, r0 // compute label = lr + element
bx ip // jump to computed label
// tell linker it can break up file at label boundaries
.subsections_via_symbols

42
compiler-rt/lib/arm/switch8.S Normal file
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@ -0,0 +1,42 @@
//===-- switch.S - Implement switch* --------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "../assembly.h"
//
// When compiling switch statements in thumb mode, the compiler
// can use these __switch* helper functions The compiler emits a blx to
// the __switch* function followed by a table of displacements for each
// case statement. On entry, R0 is the index into the table. The __switch*
// function uses the return address in lr to find the start of the table.
// The first entry in the table is the count of the entries in the table.
// It then uses R0 to index into the table and get the displacement of the
// address to jump to. If R0 is greater than the size of the table, it jumps
// to the last entry in the table. Each displacement in the table is actually
// the distance from lr to the label, thus making the tables PIC.
.text
.syntax unified
//
// The table contains signed byte sized elements which are 1/2 the distance
// from lr to the target label.
//
DEFINE_COMPILERRT_PRIVATE_FUNCTION(__switch8)
ldrb ip, [lr, #-1] // get first byte in table
cmp r0, ip // signed compare with index
ldrsbcc r0, [lr, r0] // get indexed byte out of table
ldrsbhs r0, [lr, ip] // if out of range, use last entry in table
add ip, lr, r0, lsl #1 // compute label = lr + element*2
bx ip // jump to computed label
// tell linker it can break up file at label boundaries
.subsections_via_symbols

42
compiler-rt/lib/arm/switchu8.S Normal file
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@ -0,0 +1,42 @@
//===-- switch.S - Implement switch* --------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "../assembly.h"
//
// When compiling switch statements in thumb mode, the compiler
// can use these __switch* helper functions The compiler emits a blx to
// the __switch* function followed by a table of displacements for each
// case statement. On entry, R0 is the index into the table. The __switch*
// function uses the return address in lr to find the start of the table.
// The first entry in the table is the count of the entries in the table.
// It then uses R0 to index into the table and get the displacement of the
// address to jump to. If R0 is greater than the size of the table, it jumps
// to the last entry in the table. Each displacement in the table is actually
// the distance from lr to the label, thus making the tables PIC.
.text
.syntax unified
//
// The table contains unsigned byte sized elements which are 1/2 the distance
// from lr to the target label.
//
DEFINE_COMPILERRT_PRIVATE_FUNCTION(__switchu8)
ldrb ip, [lr, #-1] // get first byte in table
cmp r0, ip // compare with index
ldrbcc r0, [lr, r0] // get indexed byte out of table
ldrbhs r0, [lr, ip] // if out of range, use last entry in table
add ip, lr, r0, lsl #1 // compute label = lr + element*2
bx ip // jump to computed label
// tell linker it can break up file at label boundaries
.subsections_via_symbols