i386: Enable VxHF vector modes lower ABI levels [PR103571]

Enable VxHF vector modes for SSE2, AVX and AVX512F ABIs.

2021-12-16  Uroš Bizjak  <ubizjak@gmail.com>

gcc/ChangeLog:

	PR target/103571
	* config/i386/i386.h (VALID_AVX256_REG_MODE): Add V16HFmode.
	(VALID_AVX256_REG_OR_OI_VHF_MODE): Replace with ...
	(VALID_AVX256_REG_OR_OI_MODE): ... this.  Remove V16HFmode.
	(VALID_AVX512F_SCALAR_MODE): Remove HImode and HFmode.
	(VALID_AVX512FP16_SCALAR_MODE): New.
	(VALID_AVX512F_REG_MODE): Add V32HFmode.
	(VALID_SSE2_REG_MODE): Add V8HFmode, V4HFmode and V2HFmode.
	(VALID_SSE2_REG_VHF_MODE): Remove.
	(VALID_INT_MODE_P): Add V2HFmode.
	* config/i386/i386.c (function_arg_advance_64):
	Remove explicit mention of V16HFmode and V32HFmode.
	(ix86_hard_regno_mode_ok): Remove explicit mention of XImode
	and V32HFmode, use VALID_AVX512F_REG_OR_XI_MODE instead.
	Use VALID_AVX512FP_SCALAR_MODE for TARGET_aVX512FP16.
	Use VALID_AVX256_REG_OR_OI_MODE instead of
	VALID_AVX256_REG_OR_OI_VHF_MODE and VALID_SSE2_REG_MODE instead
	of VALID_SSE2_REG_VHF_MODE.
	(ix86_set_reg_reg_cost): Remove usge of VALID_AVX512FP16_REG_MODE.
	(ix86_vector_mode_supported): Ditto.

gcc/testsuite/ChangeLog:

	PR target/103571
	* gcc.target/i386/pr102812.c (dg-final): Do not scan for movdqa.

2 files changed, 23 insertions, 26 deletions

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 9f4ed34..ec15582 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -2942,9 +2942,7 @@ function_arg_advance_64 (CUMULATIVE_ARGS *cum, machine_mode mode,
 
   /* Unnamed 512 and 256bit vector mode parameters are passed on stack.  */
   if (!named && (VALID_AVX512F_REG_MODE (mode)
-		 || VALID_AVX256_REG_MODE (mode)
-		 || mode == V16HFmode
-		 || mode == V32HFmode))
+		 || VALID_AVX256_REG_MODE (mode)))
     return 0;
 
   if (!examine_argument (mode, type, 0, &int_nregs, &sse_nregs)
@@ -19915,15 +19913,17 @@ ix86_hard_regno_mode_ok (unsigned int regno, machine_mode mode)
 	  - XI mode
 	  - any of 512-bit wide vector mode
 	  - any scalar mode.  */
-      /* For AVX512FP16, vmovw supports movement of HImode
-	 between gpr and sse registser.  */
       if (TARGET_AVX512F
-	  && (mode == XImode
-	      || mode == V32HFmode
-	      || VALID_AVX512F_REG_MODE (mode)
+	  && (VALID_AVX512F_REG_OR_XI_MODE (mode)
 	      || VALID_AVX512F_SCALAR_MODE (mode)))
 	return true;
 
+      /* For AVX512FP16, vmovw supports movement of HImode
+	 and HFmode between GPR and SSE registers.  */
+      if (TARGET_AVX512FP16
+	  && VALID_AVX512FP16_SCALAR_MODE (mode))
+	return true;
+
       /* For AVX-5124FMAPS or AVX-5124VNNIW
 	 allow V64SF and V64SI modes for special regnos.  */
       if ((TARGET_AVX5124FMAPS || TARGET_AVX5124VNNIW)
@@ -19934,7 +19934,7 @@ ix86_hard_regno_mode_ok (unsigned int regno, machine_mode mode)
       /* TODO check for QI/HI scalars.  */
       /* AVX512VL allows sse regs16+ for 128/256 bit modes.  */
       if (TARGET_AVX512VL
-	  && (VALID_AVX256_REG_OR_OI_VHF_MODE (mode)
+	  && (VALID_AVX256_REG_OR_OI_MODE (mode)
 	      || VALID_AVX512VL_128_REG_MODE (mode)))
 	return true;
 
@@ -19944,9 +19944,9 @@ ix86_hard_regno_mode_ok (unsigned int regno, machine_mode mode)
 
       /* OImode and AVX modes are available only when AVX is enabled.  */
       return ((TARGET_AVX
-	       && VALID_AVX256_REG_OR_OI_VHF_MODE (mode))
+	       && VALID_AVX256_REG_OR_OI_MODE (mode))
 	      || VALID_SSE_REG_MODE (mode)
-	      || VALID_SSE2_REG_VHF_MODE (mode)
+	      || VALID_SSE2_REG_MODE (mode)
 	      || VALID_MMX_REG_MODE (mode)
 	      || VALID_MMX_REG_MODE_3DNOW (mode));
     }
@@ -20156,8 +20156,7 @@ ix86_set_reg_reg_cost (machine_mode mode)
 
     case MODE_VECTOR_INT:
     case MODE_VECTOR_FLOAT:
-      if ((TARGET_AVX512FP16 && VALID_AVX512FP16_REG_MODE (mode))
-	  || (TARGET_AVX512F && VALID_AVX512F_REG_MODE (mode))
+      if ((TARGET_AVX512F && VALID_AVX512F_REG_MODE (mode))
 	  || (TARGET_AVX && VALID_AVX256_REG_MODE (mode))
 	  || (TARGET_SSE2 && VALID_SSE2_REG_MODE (mode))
 	  || (TARGET_SSE && VALID_SSE_REG_MODE (mode))
@@ -22080,8 +22079,6 @@ ix86_vector_mode_supported_p (machine_mode mode)
   if ((TARGET_MMX || TARGET_MMX_WITH_SSE)
       && VALID_MMX_REG_MODE (mode))
     return true;
-  if (TARGET_AVX512FP16 && VALID_AVX512FP16_REG_MODE (mode))
-    return true;
   if ((TARGET_3DNOW || TARGET_MMX_WITH_SSE)
       && VALID_MMX_REG_MODE_3DNOW (mode))
     return true;
diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h
index 46fdd6e..398f751 100644
--- a/gcc/config/i386/i386.h
+++ b/gcc/config/i386/i386.h
@@ -1005,20 +1005,22 @@ extern const char *host_detect_local_cpu (int argc, const char **argv);
 #define VALID_AVX256_REG_MODE(MODE)					\
   ((MODE) == V32QImode || (MODE) == V16HImode || (MODE) == V8SImode	\
    || (MODE) == V4DImode || (MODE) == V2TImode || (MODE) == V8SFmode	\
-   || (MODE) == V4DFmode)
+   || (MODE) == V4DFmode || (MODE) == V16HFmode)
 
-#define VALID_AVX256_REG_OR_OI_VHF_MODE(MODE)		\
-  (VALID_AVX256_REG_MODE (MODE) || (MODE) == OImode || (MODE) == V16HFmode)
+#define VALID_AVX256_REG_OR_OI_MODE(MODE)		\
+  (VALID_AVX256_REG_MODE (MODE) || (MODE) == OImode)
 
 #define VALID_AVX512F_SCALAR_MODE(MODE)					\
   ((MODE) == DImode || (MODE) == DFmode || (MODE) == SImode		\
-   || (MODE) == SFmode							\
-   || (TARGET_AVX512FP16 && ((MODE) == HImode || (MODE) == HFmode)))
+   || (MODE) == SFmode)
+
+#define VALID_AVX512FP16_SCALAR_MODE(MODE)	\
+  ((MODE) == HImode || (MODE) == HFmode)
 
 #define VALID_AVX512F_REG_MODE(MODE)					\
   ((MODE) == V8DImode || (MODE) == V8DFmode || (MODE) == V64QImode	\
    || (MODE) == V16SImode || (MODE) == V16SFmode || (MODE) == V32HImode \
-   || (MODE) == V4TImode)
+   || (MODE) == V4TImode || (MODE) == V32HFmode)
 
 #define VALID_AVX512F_REG_OR_XI_MODE(MODE)				\
   (VALID_AVX512F_REG_MODE (MODE) || (MODE) == XImode)
@@ -1035,13 +1037,10 @@ extern const char *host_detect_local_cpu (int argc, const char **argv);
 
 #define VALID_SSE2_REG_MODE(MODE)					\
   ((MODE) == V16QImode || (MODE) == V8HImode || (MODE) == V2DFmode	\
+   || (MODE) == V8HFmode || (MODE) == V4HFmode || (MODE) == V2HFmode	\
    || (MODE) == V4QImode || (MODE) == V2HImode || (MODE) == V1SImode	\
    || (MODE) == V2DImode || (MODE) == DFmode || (MODE) == HFmode)
 
-#define VALID_SSE2_REG_VHF_MODE(MODE)			\
-  (VALID_SSE2_REG_MODE (MODE) || (MODE) == V8HFmode	\
-   || (MODE) == V4HFmode || (MODE) == V2HFmode)
-
 #define VALID_SSE_REG_MODE(MODE)					\
   ((MODE) == V1TImode || (MODE) == TImode				\
    || (MODE) == V4SFmode || (MODE) == V4SImode				\
@@ -1072,7 +1071,8 @@ extern const char *host_detect_local_cpu (int argc, const char **argv);
    || (MODE) == CSImode || (MODE) == CDImode				\
    || (MODE) == SDmode || (MODE) == DDmode				\
    || (MODE) == HFmode || (MODE) == HCmode				\
-   || (MODE) == V4QImode || (MODE) == V2HImode || (MODE) == V1SImode	\
+   || (MODE) == V2HImode || (MODE) == V2HFmode				\
+   || (MODE) == V1SImode || (MODE) == V4QImode				\
    || (TARGET_64BIT							\
        && ((MODE) == TImode || (MODE) == CTImode			\
 	   || (MODE) == TFmode || (MODE) == TCmode			\