diff options
Diffstat (limited to 'contrib/compiler-rt/lib/arm/switch16.S')
| -rw-r--r-- | contrib/compiler-rt/lib/arm/switch16.S | 44 |
1 files changed, 0 insertions, 44 deletions
diff --git a/contrib/compiler-rt/lib/arm/switch16.S b/contrib/compiler-rt/lib/arm/switch16.S deleted file mode 100644 index e8f08c49c5df..000000000000 --- a/contrib/compiler-rt/lib/arm/switch16.S +++ /dev/null @@ -1,44 +0,0 @@ -//===-- switch.S - Implement switch* --------------------------------------===// -// -// The LLVM Compiler Infrastructure -// -// This file is dual licensed under the MIT and the University of Illinois Open -// Source Licenses. 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. -// - .align 2 -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 |