re PR target/78658 (powerpc64le: ICE with -mcpu=power9 -Og)

[gcc]
2016-12-06  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/78658
	* config/rs6000/rs6000.md (zero_extendqi<mode>2): Use ^ instead of
	?* constraints for the ISA 3.0 patterns, so the register allocator
	is more likely to allocate QImode/HImode to vector registers for
	conversion to floating point unless a reload is needed.
	(zero_extendhi<mode>2): Likewise.
	(float<QHI:mode><FP_ISA3:mode>2_internal): Properly deal with the
	first alternative which is converting QImode/HImode to floating
	point and the QImode/HImode value is in a vector register, and
	does not allocate the second pseudo register.  Remove zero
	extending into traditional floating point registers, since the
	instruction used only works on traditional altivec registers.
	(floatuns<QHI:mode><FP_ISA3:mode>2_internal): Likewise.

[gcc/testsuite]
2016-12-06  Michael Meissner  <meissner@linux.vnet.ibm.com>

	PR target/78658
	* gcc.target/powerpc/pr78658.c: New test.

From-SVN: r243320

gcc/ChangeLog

+2016-12-06  Michael Meissner  <meissner@linux.vnet.ibm.com>
+
+	PR target/78658
+	* config/rs6000/rs6000.md (zero_extendqi<mode>2): Use ^ instead of
+	?* constraints for the ISA 3.0 patterns, so the register allocator
+	is more likely to allocate QImode/HImode to vector registers for
+	conversion to floating point unless a reload is needed.
+	(zero_extendhi<mode>2): Likewise.
+	(float<QHI:mode><FP_ISA3:mode>2_internal): Properly deal with the
+	first alternative which is converting QImode/HImode to floating
+	point and the QImode/HImode value is in a vector register, and
+	does not allocate the second pseudo register.  Remove zero
+	extending into traditional floating point registers, since the
+	instruction used only works on traditional altivec registers.
+	(floatuns<QHI:mode><FP_ISA3:mode>2_internal): Likewise.
+
 2016-12-06  David Malcolm  <dmalcolm@redhat.com>
 
 	* config/i386/i386.c: Include print-rtl.h.

gcc/config/rs6000/rs6000.md

@@ -738,8 +738,8 @@
 ;; complex forms.  Basic data transfer is done later.
 
 (define_insn "zero_extendqi<mode>2"
-  [(set (match_operand:EXTQI 0 "gpc_reg_operand" "=r,r,?*wJwK,?*wK")
-	(zero_extend:EXTQI (match_operand:QI 1 "reg_or_mem_operand" "m,r,Z,*wK")))]
+  [(set (match_operand:EXTQI 0 "gpc_reg_operand" "=r,r,^wJwK,^wK")
+	(zero_extend:EXTQI (match_operand:QI 1 "reg_or_mem_operand" "m,r,Z,wK")))]
   ""
   "@
    lbz%U1%X1 %0,%1
@@ -791,7 +791,7 @@
 
 
 (define_insn "zero_extendhi<mode>2"
-  [(set (match_operand:EXTHI 0 "gpc_reg_operand" "=r,r,?*wJwK,?*wK")
+  [(set (match_operand:EXTHI 0 "gpc_reg_operand" "=r,r,^wJwK,^wK")
 	(zero_extend:EXTHI (match_operand:HI 1 "reg_or_mem_operand" "m,r,Z,wK")))]
   ""
   "@
@@ -5413,11 +5413,13 @@
 
   if (!MEM_P (input))
     {
+      rtx tmp = operands[3];
       if (altivec_register_operand (input, <QHI:MODE>mode))
 	emit_insn (gen_extend<QHI:mode>di2 (di, input));
+      else if (GET_CODE (tmp) == SCRATCH)
+	emit_insn (gen_extend<QHI:mode>di2 (di, input));
       else
 	{
-	  rtx tmp = operands[3];
 	  emit_insn (gen_extend<QHI:mode>di2 (tmp, input));
 	  emit_move_insn (di, tmp);
 	}
@@ -5449,7 +5451,7 @@
 (define_insn_and_split "*floatuns<QHI:mode><FP_ISA3:mode>2_internal"
   [(set (match_operand:FP_ISA3 0 "vsx_register_operand" "=<Fv>,<Fv>,<Fv>")
 	(unsigned_float:FP_ISA3
-	 (match_operand:QHI 1 "reg_or_indexed_operand" "wJwK,r,Z")))
+	 (match_operand:QHI 1 "reg_or_indexed_operand" "wK,r,Z")))
    (clobber (match_scratch:DI 2 "=wK,wi,wJwK"))
    (clobber (match_scratch:DI 3 "=X,r,X"))]
   "TARGET_P9_VECTOR && TARGET_DIRECT_MOVE && TARGET_POWERPC64
@@ -5467,8 +5469,13 @@
   else
     {
       rtx tmp = operands[3];
-      emit_insn (gen_zero_extend<QHI:mode>di2 (tmp, input));
-      emit_move_insn (di, tmp);
+      if (GET_CODE (tmp) == SCRATCH)
+	emit_insn (gen_extend<QHI:mode>di2 (di, input));
+      else
+	{
+	  emit_insn (gen_zero_extend<QHI:mode>di2 (tmp, input));
+	  emit_move_insn (di, tmp);
+	}
     }
 
   emit_insn (gen_floatdi<FP_ISA3:mode>2 (result, di));

gcc/testsuite/ChangeLog

+2016-12-06  Michael Meissner  <meissner@linux.vnet.ibm.com>
+
+	PR target/78658
+	* gcc.target/powerpc/pr78658.c: New test.
+
 2016-12-06  Vladimir Makarov  <vmakarov@redhat.com>
 
 	target/77761

gcc/testsuite/gcc.target/powerpc/pr78658.c

+/* { dg-do compile { target { powerpc64*-*-* && lp64 } } } */
+/* { dg-skip-if "do not override -mcpu" { powerpc*-*-* } { "-mcpu=*" } { "-mcpu=power9" } } */
+/* { dg-require-effective-target powerpc_p9vector_ok } */
+/* { dg-options "-mcpu=power9 -O2" } */
+
+/* This caused an unrecognizable insn message on development versions of GCC 7.  */
+
+float a;
+char b;
+
+void c(void)
+{
+  a = b = a;
+}