Implement builtin_cpu_is and limit cpu choices to P8 and P9 for NVIDIA compilers

Author: martin-frbg

driver/others/dynamic_power.c

@@ -27,7 +27,9 @@ static char *corename[] = {
 #define NUM_CORETYPES 4
 
 char *gotoblas_corename(void) {
+#ifndef C_PGI
 	if (gotoblas == &gotoblas_POWER6)	return corename[1];
+#endif
 	if (gotoblas == &gotoblas_POWER8)	return corename[2];
 #if (!defined __GNUC__) || ( __GNUC__ >= 6)
 	if (gotoblas == &gotoblas_POWER9)	return corename[3];
@@ -38,10 +40,157 @@ char *gotoblas_corename(void) {
 	return corename[0];
 }
 
+#ifdef C_PGI
+/*
+ * NV HPC compilers do not yet implement __builtin_cpu_is().
+ * Fake a version here for use in the CPU detection code below.
+ *
+ * Strategy here is to first check the CPU to see what it actually is,
+ * and then test the input to see if what the CPU actually is matches
+ * what was requested.
+ */
+
+#include <string.h>
+
+/*
+ *  Define POWER processor version table.
+ *
+ *  NOTE NV HPC SDK compilers only support POWER8 and POWER9 at this time
+ */
+
+#define CPU_UNKNOWN 0
+#define CPU_POWER5 5
+#define CPU_POWER6 6
+#define CPU_POWER8 8
+#define CPU_POWER9 9
+#define CPU_POWER10 10
+
+static  struct {
+    uint32_t    pvr_mask;
+    uint32_t    pvr_value;
+    const char* cpu_name;
+    uint32_t    cpu_type;
+} pvrPOWER [] = {
+
+    {   /* POWER6 in P5+ mode; 2.04-compliant processor */
+        .pvr_mask       = 0xffffffff,
+        .pvr_value      = 0x0f000001,
+        .cpu_name       = "POWER5+",
+        .cpu_type       = CPU_POWER5,
+    },
+
+    {   /* Power6 aka POWER6X*/
+        .pvr_mask       = 0xffff0000,
+        .pvr_value      = 0x003e0000,
+        .cpu_name       = "POWER6 (raw)",
+        .cpu_type       = CPU_POWER6,
+    },
+
+    {   /* Power7 */
+        .pvr_mask       = 0xffff0000,
+        .pvr_value      = 0x003f0000,
+        .cpu_name       = "POWER7 (raw)",
+        .cpu_type       = CPU_POWER6,
+    },
+
+    {   /* Power7+ */
+        .pvr_mask       = 0xffff0000,
+        .pvr_value      = 0x004A0000,
+        .cpu_name       = "POWER7+ (raw)",
+        .cpu_type       = CPU_POWER6,
+    },
+
+    {   /* Power8E */
+        .pvr_mask       = 0xffff0000,
+        .pvr_value      = 0x004b0000,
+        .cpu_name       = "POWER8E (raw)",
+        .cpu_type       = CPU_POWER8,
+    },
+
+    {   /* Power8NVL */
+        .pvr_mask       = 0xffff0000,
+        .pvr_value      = 0x004c0000,
+        .cpu_name       = "POWER8NVL (raw)",
+        .cpu_type       = CPU_POWER8,
+    },
+
+    {   /* Power8 */
+        .pvr_mask       = 0xffff0000,
+        .pvr_value      = 0x004d0000,
+        .cpu_name       = "POWER8 (raw)",
+        .cpu_type       = CPU_POWER8,
+    },
+
+    {   /* Power9 DD2.0 */
+        .pvr_mask       = 0xffffefff,
+        .pvr_value      = 0x004e0200,
+        .cpu_name       = "POWER9 (raw)",
+        .cpu_type       = CPU_POWER9,
+    },
+
+    {   /* Power9 DD 2.1 */
+        .pvr_mask       = 0xffffefff,
+        .pvr_value      = 0x004e0201,
+        .cpu_name       = "POWER9 (raw)",
+        .cpu_type       = CPU_POWER9,
+    },
+
+    {   /* Power9 DD2.2 or later */
+        .pvr_mask       = 0xffff0000,
+        .pvr_value      = 0x004e0000,
+        .cpu_name       = "POWER9 (raw)",
+        .cpu_type       = CPU_POWER9,
+    },
+
+    {   /* Power10 */
+        .pvr_mask       = 0xffff0000,
+        .pvr_value      = 0x00800000,
+        .cpu_name       = "POWER10 (raw)",
+        .cpu_type       = CPU_POWER10,
+    },
+
+    {   /* End of table, pvr_mask and pvr_value must be zero */
+        .pvr_mask       = 0x0,
+        .pvr_value      = 0x0,
+        .cpu_name       = "Unknown",
+        .cpu_type       = CPU_UNKNOWN,
+    },
+};
+
+static int __builtin_cpu_is(const char *cpu) {
+	int i;
+	uint32_t pvr;
+	uint32_t cpu_type;
+
+	asm("mfpvr    %0" : "=r"(pvr));
+
+	for (i = 0 ; i < sizeof pvrPOWER / sizeof *pvrPOWER ; ++i) {
+		if ((pvr & pvrPOWER[i].pvr_mask) == pvrPOWER[i].pvr_value) {
+			break;
+		}
+	}
+
+#if defined(DEBUG)
+	printf("%s: returning CPU=%s, cpu_type=%p\n", __func__,
+		pvrPOWER[i].cpu_name, pvrPOWER[i].cpu_type);
+#endif
+	cpu_type = pvrPOWER[i].cpu_type;
+
+	if (!strcmp(cpu, "power8"))
+		return cpu_type == CPU_POWER8;
+	if (!strcmp(cpu, "power9"))
+		return cpu_type == CPU_POWER9;
+	return 0;
+}
+
+#endif  /* C_PGI */
+
 static gotoblas_t *get_coretype(void) {
 
+#ifndef C_PGI
 	if (__builtin_cpu_is("power6") || __builtin_cpu_is("power6x"))
 		return &gotoblas_POWER6;
+#endif
 	if (__builtin_cpu_is("power8"))
 		return &gotoblas_POWER8;
 #if (!defined __GNUC__) || ( __GNUC__ >= 6)
@@ -77,7 +226,9 @@ static gotoblas_t *force_coretype(char * coretype) {
 
 	switch (found)
 	{
+#ifndef C_PGI
 	case  1: return (&gotoblas_POWER6);
+#endif
 	case  2: return (&gotoblas_POWER8);
 #if (!defined __GNUC__) || ( __GNUC__ >= 6)
 	case  3: return (&gotoblas_POWER9);