target/mips: Unroll loops for MSA float max/min instructions

Slight preformance improvement for MSA float max/min instructions.

Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com>
Reviewed-by: Aleksandar Rikalo <arikalo@wavecomp.com>
Message-Id: <1562068213-11307-7-git-send-email-aleksandar.markovic@rt-rk.com>

1 files changed, 125 insertions, 73 deletions

diff --git a/target/mips/msa_helper.c b/target/mips/msa_helper.c
index 5377bc1..97f840b 100644
--- a/target/mips/msa_helper.c
+++ b/target/mips/msa_helper.c
@@ -3850,35 +3850,65 @@ void helper_msa_fmin_df(CPUMIPSState *env, uint32_t df, uint32_t wd,
     wr_t *pwd = &(env->active_fpu.fpr[wd].wr);
     wr_t *pws = &(env->active_fpu.fpr[ws].wr);
     wr_t *pwt = &(env->active_fpu.fpr[wt].wr);
-    uint32_t i;
 
     clear_msacsr_cause(env);
 
-    switch (df) {
-    case DF_WORD:
-        for (i = 0; i < DF_ELEMENTS(DF_WORD); i++) {
-            if (NUMBER_QNAN_PAIR(pws->w[i], pwt->w[i], 32, status)) {
-                MSA_FLOAT_MAXOP(pwx->w[i], min, pws->w[i], pws->w[i], 32);
-            } else if (NUMBER_QNAN_PAIR(pwt->w[i], pws->w[i], 32, status)) {
-                MSA_FLOAT_MAXOP(pwx->w[i], min, pwt->w[i], pwt->w[i], 32);
-            } else {
-                MSA_FLOAT_MAXOP(pwx->w[i], min, pws->w[i], pwt->w[i], 32);
-            }
+    if (df == DF_WORD) {
+
+        if (NUMBER_QNAN_PAIR(pws->w[0], pwt->w[0], 32, status)) {
+            MSA_FLOAT_MAXOP(pwx->w[0], min, pws->w[0], pws->w[0], 32);
+        } else if (NUMBER_QNAN_PAIR(pwt->w[0], pws->w[0], 32, status)) {
+            MSA_FLOAT_MAXOP(pwx->w[0], min, pwt->w[0], pwt->w[0], 32);
+        } else {
+            MSA_FLOAT_MAXOP(pwx->w[0], min, pws->w[0], pwt->w[0], 32);
         }
-        break;
-    case DF_DOUBLE:
-        for (i = 0; i < DF_ELEMENTS(DF_DOUBLE); i++) {
-            if (NUMBER_QNAN_PAIR(pws->d[i], pwt->d[i], 64, status)) {
-                MSA_FLOAT_MAXOP(pwx->d[i], min, pws->d[i], pws->d[i], 64);
-            } else if (NUMBER_QNAN_PAIR(pwt->d[i], pws->d[i], 64, status)) {
-                MSA_FLOAT_MAXOP(pwx->d[i], min, pwt->d[i], pwt->d[i], 64);
-            } else {
-                MSA_FLOAT_MAXOP(pwx->d[i], min, pws->d[i], pwt->d[i], 64);
-            }
+
+        if (NUMBER_QNAN_PAIR(pws->w[1], pwt->w[1], 32, status)) {
+            MSA_FLOAT_MAXOP(pwx->w[1], min, pws->w[1], pws->w[1], 32);
+        } else if (NUMBER_QNAN_PAIR(pwt->w[1], pws->w[1], 32, status)) {
+            MSA_FLOAT_MAXOP(pwx->w[1], min, pwt->w[1], pwt->w[1], 32);
+        } else {
+            MSA_FLOAT_MAXOP(pwx->w[1], min, pws->w[1], pwt->w[1], 32);
         }
-        break;
-    default:
+
+        if (NUMBER_QNAN_PAIR(pws->w[2], pwt->w[2], 32, status)) {
+            MSA_FLOAT_MAXOP(pwx->w[2], min, pws->w[2], pws->w[2], 32);
+        } else if (NUMBER_QNAN_PAIR(pwt->w[2], pws->w[2], 32, status)) {
+            MSA_FLOAT_MAXOP(pwx->w[2], min, pwt->w[2], pwt->w[2], 32);
+        } else {
+            MSA_FLOAT_MAXOP(pwx->w[2], min, pws->w[2], pwt->w[2], 32);
+        }
+
+        if (NUMBER_QNAN_PAIR(pws->w[3], pwt->w[3], 32, status)) {
+            MSA_FLOAT_MAXOP(pwx->w[3], min, pws->w[3], pws->w[3], 32);
+        } else if (NUMBER_QNAN_PAIR(pwt->w[3], pws->w[3], 32, status)) {
+            MSA_FLOAT_MAXOP(pwx->w[3], min, pwt->w[3], pwt->w[3], 32);
+        } else {
+            MSA_FLOAT_MAXOP(pwx->w[3], min, pws->w[3], pwt->w[3], 32);
+        }
+
+    } else if (df == DF_DOUBLE) {
+
+        if (NUMBER_QNAN_PAIR(pws->d[0], pwt->d[0], 64, status)) {
+            MSA_FLOAT_MAXOP(pwx->d[0], min, pws->d[0], pws->d[0], 64);
+        } else if (NUMBER_QNAN_PAIR(pwt->d[0], pws->d[0], 64, status)) {
+            MSA_FLOAT_MAXOP(pwx->d[0], min, pwt->d[0], pwt->d[0], 64);
+        } else {
+            MSA_FLOAT_MAXOP(pwx->d[0], min, pws->d[0], pwt->d[0], 64);
+        }
+
+        if (NUMBER_QNAN_PAIR(pws->d[1], pwt->d[1], 64, status)) {
+            MSA_FLOAT_MAXOP(pwx->d[1], min, pws->d[1], pws->d[1], 64);
+        } else if (NUMBER_QNAN_PAIR(pwt->d[1], pws->d[1], 64, status)) {
+            MSA_FLOAT_MAXOP(pwx->d[1], min, pwt->d[1], pwt->d[1], 64);
+        } else {
+            MSA_FLOAT_MAXOP(pwx->d[1], min, pws->d[1], pwt->d[1], 64);
+        }
+
+    } else {
+
         assert(0);
+
     }
 
     check_msacsr_cause(env, GETPC());
@@ -3894,22 +3924,18 @@ void helper_msa_fmin_a_df(CPUMIPSState *env, uint32_t df, uint32_t wd,
     wr_t *pwd = &(env->active_fpu.fpr[wd].wr);
     wr_t *pws = &(env->active_fpu.fpr[ws].wr);
     wr_t *pwt = &(env->active_fpu.fpr[wt].wr);
-    uint32_t i;
 
     clear_msacsr_cause(env);
 
-    switch (df) {
-    case DF_WORD:
-        for (i = 0; i < DF_ELEMENTS(DF_WORD); i++) {
-            FMAXMIN_A(min, max, pwx->w[i], pws->w[i], pwt->w[i], 32, status);
-        }
-        break;
-    case DF_DOUBLE:
-        for (i = 0; i < DF_ELEMENTS(DF_DOUBLE); i++) {
-            FMAXMIN_A(min, max, pwx->d[i], pws->d[i], pwt->d[i], 64, status);
-        }
-        break;
-    default:
+    if (df == DF_WORD) {
+        FMAXMIN_A(min, max, pwx->w[0], pws->w[0], pwt->w[0], 32, status);
+        FMAXMIN_A(min, max, pwx->w[1], pws->w[1], pwt->w[1], 32, status);
+        FMAXMIN_A(min, max, pwx->w[2], pws->w[2], pwt->w[2], 32, status);
+        FMAXMIN_A(min, max, pwx->w[3], pws->w[3], pwt->w[3], 32, status);
+    } else if (df == DF_DOUBLE) {
+        FMAXMIN_A(min, max, pwx->d[0], pws->d[0], pwt->d[0], 64, status);
+        FMAXMIN_A(min, max, pwx->d[1], pws->d[1], pwt->d[1], 64, status);
+    } else {
         assert(0);
     }
 
@@ -3921,40 +3947,70 @@ void helper_msa_fmin_a_df(CPUMIPSState *env, uint32_t df, uint32_t wd,
 void helper_msa_fmax_df(CPUMIPSState *env, uint32_t df, uint32_t wd,
         uint32_t ws, uint32_t wt)
 {
-    float_status *status = &env->active_tc.msa_fp_status;
+     float_status *status = &env->active_tc.msa_fp_status;
     wr_t wx, *pwx = &wx;
     wr_t *pwd = &(env->active_fpu.fpr[wd].wr);
     wr_t *pws = &(env->active_fpu.fpr[ws].wr);
     wr_t *pwt = &(env->active_fpu.fpr[wt].wr);
-    uint32_t i;
 
     clear_msacsr_cause(env);
 
-    switch (df) {
-    case DF_WORD:
-        for (i = 0; i < DF_ELEMENTS(DF_WORD); i++) {
-            if (NUMBER_QNAN_PAIR(pws->w[i], pwt->w[i], 32, status)) {
-                MSA_FLOAT_MAXOP(pwx->w[i], max, pws->w[i], pws->w[i], 32);
-            } else if (NUMBER_QNAN_PAIR(pwt->w[i], pws->w[i], 32, status)) {
-                MSA_FLOAT_MAXOP(pwx->w[i], max, pwt->w[i], pwt->w[i], 32);
-            } else {
-                MSA_FLOAT_MAXOP(pwx->w[i], max, pws->w[i], pwt->w[i], 32);
-            }
+    if (df == DF_WORD) {
+
+        if (NUMBER_QNAN_PAIR(pws->w[0], pwt->w[0], 32, status)) {
+            MSA_FLOAT_MAXOP(pwx->w[0], max, pws->w[0], pws->w[0], 32);
+        } else if (NUMBER_QNAN_PAIR(pwt->w[0], pws->w[0], 32, status)) {
+            MSA_FLOAT_MAXOP(pwx->w[0], max, pwt->w[0], pwt->w[0], 32);
+        } else {
+            MSA_FLOAT_MAXOP(pwx->w[0], max, pws->w[0], pwt->w[0], 32);
         }
-        break;
-    case DF_DOUBLE:
-        for (i = 0; i < DF_ELEMENTS(DF_DOUBLE); i++) {
-            if (NUMBER_QNAN_PAIR(pws->d[i], pwt->d[i], 64, status)) {
-                MSA_FLOAT_MAXOP(pwx->d[i], max, pws->d[i], pws->d[i], 64);
-            } else if (NUMBER_QNAN_PAIR(pwt->d[i], pws->d[i], 64, status)) {
-                MSA_FLOAT_MAXOP(pwx->d[i], max, pwt->d[i], pwt->d[i], 64);
-            } else {
-                MSA_FLOAT_MAXOP(pwx->d[i], max, pws->d[i], pwt->d[i], 64);
-            }
+
+        if (NUMBER_QNAN_PAIR(pws->w[1], pwt->w[1], 32, status)) {
+            MSA_FLOAT_MAXOP(pwx->w[1], max, pws->w[1], pws->w[1], 32);
+        } else if (NUMBER_QNAN_PAIR(pwt->w[1], pws->w[1], 32, status)) {
+            MSA_FLOAT_MAXOP(pwx->w[1], max, pwt->w[1], pwt->w[1], 32);
+        } else {
+            MSA_FLOAT_MAXOP(pwx->w[1], max, pws->w[1], pwt->w[1], 32);
         }
-        break;
-    default:
+
+        if (NUMBER_QNAN_PAIR(pws->w[2], pwt->w[2], 32, status)) {
+            MSA_FLOAT_MAXOP(pwx->w[2], max, pws->w[2], pws->w[2], 32);
+        } else if (NUMBER_QNAN_PAIR(pwt->w[2], pws->w[2], 32, status)) {
+            MSA_FLOAT_MAXOP(pwx->w[2], max, pwt->w[2], pwt->w[2], 32);
+        } else {
+            MSA_FLOAT_MAXOP(pwx->w[2], max, pws->w[2], pwt->w[2], 32);
+        }
+
+        if (NUMBER_QNAN_PAIR(pws->w[3], pwt->w[3], 32, status)) {
+            MSA_FLOAT_MAXOP(pwx->w[3], max, pws->w[3], pws->w[3], 32);
+        } else if (NUMBER_QNAN_PAIR(pwt->w[3], pws->w[3], 32, status)) {
+            MSA_FLOAT_MAXOP(pwx->w[3], max, pwt->w[3], pwt->w[3], 32);
+        } else {
+            MSA_FLOAT_MAXOP(pwx->w[3], max, pws->w[3], pwt->w[3], 32);
+        }
+
+    } else if (df == DF_DOUBLE) {
+
+        if (NUMBER_QNAN_PAIR(pws->d[0], pwt->d[0], 64, status)) {
+            MSA_FLOAT_MAXOP(pwx->d[0], max, pws->d[0], pws->d[0], 64);
+        } else if (NUMBER_QNAN_PAIR(pwt->d[0], pws->d[0], 64, status)) {
+            MSA_FLOAT_MAXOP(pwx->d[0], max, pwt->d[0], pwt->d[0], 64);
+        } else {
+            MSA_FLOAT_MAXOP(pwx->d[0], max, pws->d[0], pwt->d[0], 64);
+        }
+
+        if (NUMBER_QNAN_PAIR(pws->d[1], pwt->d[1], 64, status)) {
+            MSA_FLOAT_MAXOP(pwx->d[1], max, pws->d[1], pws->d[1], 64);
+        } else if (NUMBER_QNAN_PAIR(pwt->d[1], pws->d[1], 64, status)) {
+            MSA_FLOAT_MAXOP(pwx->d[1], max, pwt->d[1], pwt->d[1], 64);
+        } else {
+            MSA_FLOAT_MAXOP(pwx->d[1], max, pws->d[1], pwt->d[1], 64);
+        }
+
+    } else {
+
         assert(0);
+
     }
 
     check_msacsr_cause(env, GETPC());
@@ -3970,22 +4026,18 @@ void helper_msa_fmax_a_df(CPUMIPSState *env, uint32_t df, uint32_t wd,
     wr_t *pwd = &(env->active_fpu.fpr[wd].wr);
     wr_t *pws = &(env->active_fpu.fpr[ws].wr);
     wr_t *pwt = &(env->active_fpu.fpr[wt].wr);
-    uint32_t i;
 
     clear_msacsr_cause(env);
 
-    switch (df) {
-    case DF_WORD:
-        for (i = 0; i < DF_ELEMENTS(DF_WORD); i++) {
-            FMAXMIN_A(max, min, pwx->w[i], pws->w[i], pwt->w[i], 32, status);
-        }
-        break;
-    case DF_DOUBLE:
-        for (i = 0; i < DF_ELEMENTS(DF_DOUBLE); i++) {
-            FMAXMIN_A(max, min, pwx->d[i], pws->d[i], pwt->d[i], 64, status);
-        }
-        break;
-    default:
+    if (df == DF_WORD) {
+        FMAXMIN_A(max, min, pwx->w[0], pws->w[0], pwt->w[0], 32, status);
+        FMAXMIN_A(max, min, pwx->w[1], pws->w[1], pwt->w[1], 32, status);
+        FMAXMIN_A(max, min, pwx->w[2], pws->w[2], pwt->w[2], 32, status);
+        FMAXMIN_A(max, min, pwx->w[3], pws->w[3], pwt->w[3], 32, status);
+    } else if (df == DF_DOUBLE) {
+        FMAXMIN_A(max, min, pwx->d[0], pws->d[0], pwt->d[0], 64, status);
+        FMAXMIN_A(max, min, pwx->d[1], pws->d[1], pwt->d[1], 64, status);
+    } else {
         assert(0);
     }