[PATCH] PR 92846: [ARC] generate signaling FDCMPF for hard float comparisons

[Vineet Gupta <Vineet.Gupta1@synopsys.com>]

ARC gcc generates FDCMP instructions which raises Invalid operation for
signaling NaN only. This causes glibc iseqsig() primitives to fail (in
the current ongoing glibc port to ARC)

So split up the hard float compares into two categories and for unordered
compares generate the FDCMPF instruction (vs. FDCMP) which raises exception
for either NaNs.

With this fix testsuite/gcc.dg/torture/pr52451.c passes for ARC.

Also passes 6 additional tests in glibc testsuite (test*iseqsig) and no
regressions

gcc/
xxxx-xx-xx  Vineet Gupta  <vgupta@synopsys.com>

	* config/arc/arc-modes.def (CC_FPUE): New Mode CC_FPUE which
	helps codegen generate exceptions even for quiet NaN.
	* config/arc/arc.c (arc_init_reg_tables): Handle New CC_FPUE mode.
	(get_arc_condition_code): Likewise.
	(arc_select_cc_mode): LT, LE, GT, GE to use the New CC_FPUE mode.
	* config/arc/arc.h (REVERSE_CONDITION): Handle New CC_FPUE mode.
	* config/arc/predicates.md (proper_comparison_operator): Likewise.
	* config/arc/fpu.md (cmpsf_fpu_trap): New Pattern for CC_FPUE.
	(cmpdf_fpu_trap): Likewise.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
---
 gcc/config/arc/arc-modes.def |  1 +
 gcc/config/arc/arc.c         |  8 ++++++--
 gcc/config/arc/arc.h         |  2 +-
 gcc/config/arc/fpu.md        | 24 ++++++++++++++++++++++++
 gcc/config/arc/predicates.md |  1 +
 5 files changed, 33 insertions(+), 3 deletions(-)

diff --git a/gcc/config/arc/arc-modes.def b/gcc/config/arc/arc-modes.def
index 36a2f4abfb25..d16b6a289a15 100644
--- a/gcc/config/arc/arc-modes.def
+++ b/gcc/config/arc/arc-modes.def
@@ -38,4 +38,5 @@ VECTOR_MODES (INT, 16);       /* V16QI V8HI V4SI V2DI */
 
 /* FPU condition flags.  */
 CC_MODE (CC_FPU);
+CC_MODE (CC_FPUE);
 CC_MODE (CC_FPU_UNEQ);
diff --git a/gcc/config/arc/arc.c b/gcc/config/arc/arc.c
index 28305f459dcd..cbb95d6e9043 100644
--- a/gcc/config/arc/arc.c
+++ b/gcc/config/arc/arc.c
@@ -1564,6 +1564,7 @@ get_arc_condition_code (rtx comparison)
 	default : gcc_unreachable ();
 	}
     case E_CC_FPUmode:
+    case E_CC_FPUEmode:
       switch (GET_CODE (comparison))
 	{
 	case EQ	       : return ARC_CC_EQ;
@@ -1686,11 +1687,13 @@ arc_select_cc_mode (enum rtx_code op, rtx x, rtx y)
       case UNLE:
       case UNGT:
       case UNGE:
+	return CC_FPUmode;
+
       case LT:
       case LE:
       case GT:
       case GE:
-	return CC_FPUmode;
+	return CC_FPUEmode;
 
       case LTGT:
       case UNEQ:
@@ -1844,7 +1847,7 @@ arc_init_reg_tables (void)
 	  if (i == (int) CCmode || i == (int) CC_ZNmode || i == (int) CC_Zmode
 	      || i == (int) CC_Cmode
 	      || i == CC_FP_GTmode || i == CC_FP_GEmode || i == CC_FP_ORDmode
-	      || i == CC_FPUmode || i == CC_FPU_UNEQmode)
+	      || i == CC_FPUmode || i == CC_FPUEmode || i == CC_FPU_UNEQmode)
 	    arc_mode_class[i] = 1 << (int) C_MODE;
 	  else
 	    arc_mode_class[i] = 0;
@@ -8401,6 +8404,7 @@ arc_reorg (void)
 
 	  /* Avoid FPU instructions.  */
 	  if ((GET_MODE (XEXP (XEXP (pc_target, 0), 0)) == CC_FPUmode)
+	      || (GET_MODE (XEXP (XEXP (pc_target, 0), 0)) == CC_FPUEmode)
 	      || (GET_MODE (XEXP (XEXP (pc_target, 0), 0)) == CC_FPU_UNEQmode))
 	    continue;
 
diff --git a/gcc/config/arc/arc.h b/gcc/config/arc/arc.h
index 4d7ac3281b41..c08ca3d0d432 100644
--- a/gcc/config/arc/arc.h
+++ b/gcc/config/arc/arc.h
@@ -1531,7 +1531,7 @@ enum arc_function_type {
   (((MODE) == CC_FP_GTmode || (MODE) == CC_FP_GEmode		 \
     || (MODE) == CC_FP_UNEQmode || (MODE) == CC_FP_ORDmode	 \
     || (MODE) == CC_FPXmode || (MODE) == CC_FPU_UNEQmode	 \
-    || (MODE) == CC_FPUmode)					 \
+    || (MODE) == CC_FPUmode || (MODE) == CC_FPUEmode)		 \
    ? reverse_condition_maybe_unordered ((CODE))			 \
    : reverse_condition ((CODE)))
 
diff --git a/gcc/config/arc/fpu.md b/gcc/config/arc/fpu.md
index 6289e9c3f593..6729795de542 100644
--- a/gcc/config/arc/fpu.md
+++ b/gcc/config/arc/fpu.md
@@ -242,6 +242,18 @@
    (set_attr "type" "fpu")
    (set_attr "predicable" "yes")])
 
+(define_insn "*cmpsf_fpu_trap"
+  [(set (reg:CC_FPUE CC_REG)
+	(compare:CC_FPUE (match_operand:SF 0 "register_operand"  "r,  r,r")
+			(match_operand:SF 1 "nonmemory_operand" "r,CfZ,F")))]
+  "TARGET_FP_SP_BASE"
+  "fscmpf%?\\t%0,%1"
+  [(set_attr "length" "4,4,8")
+   (set_attr "iscompact" "false")
+   (set_attr "cond" "set")
+   (set_attr "type" "fpu")
+   (set_attr "predicable" "yes")])
+
 (define_insn "*cmpsf_fpu_uneq"
   [(set (reg:CC_FPU_UNEQ CC_REG)
 	(compare:CC_FPU_UNEQ
@@ -338,6 +350,18 @@
    (set_attr "type" "fpu")
    (set_attr "predicable" "yes")])
 
+(define_insn "*cmpdf_fpu_trap"
+  [(set (reg:CC_FPUE CC_REG)
+	(compare:CC_FPUE (match_operand:DF 0 "even_register_operand"  "r")
+			(match_operand:DF 1 "even_register_operand"  "r")))]
+  "TARGET_FP_DP_BASE"
+  "fdcmpf%? %0, %1"
+  [(set_attr "length" "4")
+   (set_attr "iscompact" "false")
+   (set_attr "cond" "set")
+   (set_attr "type" "fpu")
+   (set_attr "predicable" "yes")])
+
 (define_insn "*cmpdf_fpu_uneq"
   [(set (reg:CC_FPU_UNEQ CC_REG)
 	(compare:CC_FPU_UNEQ
diff --git a/gcc/config/arc/predicates.md b/gcc/config/arc/predicates.md
index e0013b32f0f5..4d2ad7ba6789 100644
--- a/gcc/config/arc/predicates.md
+++ b/gcc/config/arc/predicates.md
@@ -439,6 +439,7 @@
 	      || code == ORDERED || code == UNORDERED);
 
     case E_CC_FPUmode:
+    case E_CC_FPUEmode:
       return 1;
     case E_CC_FPU_UNEQmode:
       return 1;
-- 
2.20.1


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