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tcg: Eliminate one store for in-place 128-bit dup_mem 

Do not store back to the exact memory from which we just loaded.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2020-08-14 15:02:57 -07:00
parent 4ca3d09cd9
commit 6a17646176
1 changed files with 2 additions and 2 deletions
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4
tcg/tcg-op-gvec.c
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@ -1581,7 +1581,7 @@ void tcg_gen_gvec_dup_mem(unsigned vece, uint32_t dofs, uint32_t aofs,
TCGv_vec in = tcg_temp_new_vec(TCG_TYPE_V128);
tcg_gen_ld_vec(in, cpu_env, aofs);
for (i = 0; i < oprsz; i += 16) {
for (i = (aofs == dofs) * 16; i < oprsz; i += 16) {
tcg_gen_st_vec(in, cpu_env, dofs + i);
}
tcg_temp_free_vec(in);
@ -1591,7 +1591,7 @@ void tcg_gen_gvec_dup_mem(unsigned vece, uint32_t dofs, uint32_t aofs,
tcg_gen_ld_i64(in0, cpu_env, aofs);
tcg_gen_ld_i64(in1, cpu_env, aofs + 8);
for (i = 0; i < oprsz; i += 16) {
for (i = (aofs == dofs) * 16; i < oprsz; i += 16) {
tcg_gen_st_i64(in0, cpu_env, dofs + i);
tcg_gen_st_i64(in1, cpu_env, dofs + i + 8);
}