| From: Xin Ouyang <Xin.Ouyang@windriver.com> |
| Date: Mon, 16 Jul 2012 13:29:34 +0800 |
| Subject: [PATCH] tremor: add IT instructions for arm thumb2 tune flags. |
| |
| Upstream-Status: Pending |
| |
| In Thumb-2, most instructions do not have a built in condition code (except for |
| conditional branches). Instead, short sequences of instructions which are to be |
| executed conditionally can be preceded by a special "IT instruction" which |
| describes the condition and which of the following instructions should be |
| executed if the condition is false respectively. |
| |
| For the ARM/Thumb IT(If-Then) instruction: |
| http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0489c/Cjabicci.html |
| |
| Signed-off-by: Xin Ouyang <Xin.Ouyang@windriver.com> |
| --- |
| asm_arm.h | 14 ++++++++++++++ |
| 1 file changed, 14 insertions(+) |
| |
| diff --git a/asm_arm.h b/asm_arm.h |
| index c3bda00..823c54f 100755 |
| --- a/asm_arm.h |
| +++ b/asm_arm.h |
| @@ -108,9 +108,11 @@ static inline void XNPROD31(ogg_int32_t a, ogg_int32_t b, |
| static inline ogg_int32_t CLIP_TO_15(ogg_int32_t x) { |
| int tmp; |
| asm volatile("subs %1, %0, #32768\n\t" |
| + "itt pl\n\t" |
| "movpl %0, #0x7f00\n\t" |
| "orrpl %0, %0, #0xff\n" |
| "adds %1, %0, #32768\n\t" |
| + "it mi\n\t" |
| "movmi %0, #0x8000" |
| : "+r"(x),"=r"(tmp) |
| : |
| @@ -139,10 +141,12 @@ static inline void lsp_loop_asm(ogg_uint32_t *qip,ogg_uint32_t *pip, |
| |
| "ldmdb r0!,{r1,r3};" |
| "subs r1,r1,%4;" //ilsp[j]-wi |
| + "it mi;" |
| "rsbmi r1,r1,#0;" //labs(ilsp[j]-wi) |
| "umull %0,r2,r1,%0;" //qi*=labs(ilsp[j]-wi) |
| |
| "subs r1,r3,%4;" //ilsp[j+1]-wi |
| + "it mi;" |
| "rsbmi r1,r1,#0;" //labs(ilsp[j+1]-wi) |
| "umull %1,r3,r1,%1;" //pi*=labs(ilsp[j+1]-wi) |
| |
| @@ -167,6 +171,7 @@ static inline void lsp_loop_asm(ogg_uint32_t *qip,ogg_uint32_t *pip, |
| "mov r0,#0x4000;\n" |
| |
| "subs r1,r1,%4;\n" //ilsp[j]-wi |
| + "it mi;\n" |
| "rsbmi r1,r1,#0;\n" //labs(ilsp[j]-wi) |
| "umull %0,r2,r1,%0;\n" //qi*=labs(ilsp[j]-wi) |
| "umull %1,r3,r0,%1;\n" //pi*=labs(ilsp[j+1]-wi) |
| @@ -190,18 +195,23 @@ static inline void lsp_loop_asm(ogg_uint32_t *qip,ogg_uint32_t *pip, |
| "mov r2,#0;" |
| "orr r1,%0,%1;" |
| "tst r1,#0xff000000;" |
| + "itt ne;" |
| "addne r2,r2,#8;" |
| "movne r1,r1,lsr #8;" |
| "tst r1,#0x00f00000;" |
| + "itt ne;" |
| "addne r2,r2,#4;" |
| "movne r1,r1,lsr #4;" |
| "tst r1,#0x000c0000;" |
| + "itt ne;" |
| "addne r2,r2,#2;" |
| "movne r1,r1,lsr #2;" |
| "tst r1,#0x00020000;" |
| + "itt ne;" |
| "addne r2,r2,#1;" |
| "movne r1,r1,lsr #1;" |
| "tst r1,#0x00010000;" |
| + "it ne;" |
| "addne r2,r2,#1;" |
| "mov %0,%0,lsr r2;" |
| "mov %1,%1,lsr r2;" |
| @@ -222,15 +232,19 @@ static inline void lsp_norm_asm(ogg_uint32_t *qip,ogg_int32_t *qexpp){ |
| ogg_int32_t qexp=*qexpp; |
| |
| asm("tst %0,#0x0000ff00;" |
| + "itt eq;" |
| "moveq %0,%0,lsl #8;" |
| "subeq %1,%1,#8;" |
| "tst %0,#0x0000f000;" |
| + "itt eq;" |
| "moveq %0,%0,lsl #4;" |
| "subeq %1,%1,#4;" |
| "tst %0,#0x0000c000;" |
| + "itt eq;" |
| "moveq %0,%0,lsl #2;" |
| "subeq %1,%1,#2;" |
| "tst %0,#0x00008000;" |
| + "itt eq;" |
| "moveq %0,%0,lsl #1;" |
| "subeq %1,%1,#1;" |
| : "+r"(qi),"+r"(qexp) |
| -- |
| 1.7.9.5 |
| |