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ARM before armv6 did not supprt 'rev' instruction 

llvm-svn: 107548
This commit is contained in:
Nick Kledzik 2010-07-03 00:12:47 +00:00
parent 4c82a9e7d0
commit 209ac43b76
2 changed files with 31 additions and 0 deletions
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20
compiler-rt/lib/arm/bswapdi2.S
View File

@ -16,8 +16,28 @@
//
.align 2
DEFINE_COMPILERRT_FUNCTION(__bswapdi2)
#if __ARM_ARCH_5TEJ__ || __ARM_ARCH_4T__
// before armv6 does not have "rev" instruction
stmfd sp!, {r7, lr}
mov r7, sp
mov r2, #255, 24
and r3, r2, r1, lsr #8
mov r12, #255, 16
and lr, r12, r1, lsl #8
orr r3, r3, r1, lsr #24
orr r1, lr, r1, lsl #24
and r2, r2, r0, lsr #8
orr r3, r1, r3
orr r1, r2, r0, lsr #24
and r2, r12, r0, lsl #8
orr r0, r2, r0, lsl #24
orr r1, r0, r1
mov r0, r3
ldmfd sp!, {r7, pc}
#else
rev r2, r1 // reverse bytes in high 32-bits into temp2
rev r3, r0 // reverse bytes in low 32-bit into temp3
mov r0, r2 // set low 32-bits of result to temp2
mov r1, r3 // set high 32-bits of result to temp3
bx lr
#endif

11
compiler-rt/lib/arm/bswapsi2.S
View File

@ -16,5 +16,16 @@
//
.align 2
DEFINE_COMPILERRT_FUNCTION(__bswapsi2)
#if __ARM_ARCH_5TEJ__ || __ARM_ARCH_4T__
// before armv6 does not have "rev" instruction
mov r1, #255, 24
mov r2, #255, 16
and r1, r1, r0, lsr #8
and r2, r2, r0, lsl #8
orr r1, r1, r0, lsr #24
orr r0, r2, r0, lsl #24
orr r0, r0, r1
#else
rev r0, r0 // reverse bytes in parameter and put into result register
#endif
bx lr