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[PATCH 2/3] tcg: Eliminate one store for in-place 128-bit dup_mem
From: |
Richard Henderson |
Subject: |
[PATCH 2/3] tcg: Eliminate one store for in-place 128-bit dup_mem |
Date: |
Fri, 28 Aug 2020 11:02:42 -0700 |
Do not store back to the exact memory from which we just loaded.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
tcg/tcg-op-gvec.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/tcg/tcg-op-gvec.c b/tcg/tcg-op-gvec.c
index 793d4ba64c..fcc25b04e6 100644
--- a/tcg/tcg-op-gvec.c
+++ b/tcg/tcg-op-gvec.c
@@ -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);
}
--
2.25.1