cd91a08487
Introduce simple peephole2 optimization which substitutes a sequence of
four consecutive load or store (LDR, STR) instructions with two load or
store pair (LDP, STP) instructions for 2 element supported vector modes
(V2SI, V2SF, V2DI, and V2DF).
Generated load / store pair instruction offset is adjusted accordingly.
Bootstrapped and tested on aarch64-none-linux-gnu.
Example:
$ cat stp_vec_v2sf.c
typedef float __attribute__((vector_size(8))) vec;
void
store_adjusted(vec *out, vec x, vec y)
{
out[400] = x;
out[401] = y;
out[402] = y;
out[403] = x;
}
Example compiled with:
$ ./aarch64-none-linux-gnu-gcc -S -O2 stp_vec_v2sf.c -dp
Before the patch:
store_adjusted:
str d0, [x0, 3200] // 9 [c=4 l=4] *aarch64_simd_movv2si/2
str d1, [x0, 3208] // 11 [c=4 l=4] *aarch64_simd_movv2si/2
str d1, [x0, 3216] // 13 [c=4 l=4] *aarch64_simd_movv2si/2
str d0, [x0, 3224] // 15 [c=4 l=4] *aarch64_simd_movv2si/2
ret // 26 [c=0 l=4] *do_return
After the patch:
store_adjusted:
add x1, x0, 3200 // 27 [c=4 l=4] *adddi3_aarch64/0
stp d0, d1, [x1] // 28 [c=0 l=4] vec_store_pairv2siv2si
stp d1, d0, [x1, 16] // 29 [c=0 l=4] vec_store_pairv2siv2si
ret // 22 [c=0 l=4] *do_return
gcc/ChangeLog:
* config/aarch64/aarch64-ldpstp.md: Add two peepholes for adjusted vector
V2SI, V2SF, V2DI, V2DF load pair and store pair modes.
* config/aarch64/aarch64-protos.h (aarch64_gen_adjusted_ldpstp):
Change mode parameter to machine_mode.
(aarch64_operands_adjust_ok_for_ldpstp): Change mode parameter to
machine_mode.
* config/aarch64/aarch64.c (aarch64_operands_adjust_ok_for_ldpstp):
Change mode parameter to machine_mode.
(aarch64_gen_adjusted_ldpstp): Change mode parameter to machine_mode.
* config/aarch64/iterators.md (VP_2E): New iterator for 2 element vectors.
gcc/testsuite/ChangeLog:
* gcc.target/aarch64/ldp_vec_v2sf.c: New test.
* gcc.target/aarch64/ldp_vec_v2si.c: New test.
* gcc.target/aarch64/stp_vec_v2df.c: New test.
* gcc.target/aarch64/stp_vec_v2di.c: New test.
* gcc.target/aarch64/stp_vec_v2sf.c: New test.
* gcc.target/aarch64/stp_vec_v2si.c: New test.
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| config | ||
| contrib | ||
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