re PR target/16144 (Bogus reference to __divdf3 when -O1)

	PR target/16144
	* config/mips/mips.md (divsf, divdf): Don't FAIL if the first operand
	is 1.0; force it into a register instead.

From-SVN: r83639

gcc/ChangeLog

+2004-06-25  Richard Sandiford  <rsandifo@redhat.com>
+
+	PR target/16144
+	* config/mips/mips.md (divsf, divdf): Don't FAIL if the first operand
+	is 1.0; force it into a register instead.
+
 2004-06-25  Bernardo Innocenti  <bernie@develer.com>
 
 	* config/m68k/m68k.h: Restore valid comment removed by mistake with

gcc/config/mips/mips.md

@@ -2322,7 +2322,7 @@
 {
   if (const_float_1_operand (operands[1], DFmode))
     if (!(ISA_HAS_FP4 && flag_unsafe_math_optimizations))
-      FAIL;
+      operands[1] = force_reg (DFmode, operands[1]);
 })
 
 ;; This pattern works around the early SB-1 rev2 core "F1" erratum:
@@ -2372,7 +2372,7 @@
 {
   if (const_float_1_operand (operands[1], SFmode))
     if (!(ISA_HAS_FP4 && flag_unsafe_math_optimizations))
-      FAIL;
+      operands[1] = force_reg (SFmode, operands[1]);
 })
 
 ;; This pattern works around the early SB-1 rev2 core "F1" erratum (see

gcc/testsuite/ChangeLog

+2004-06-25  Richard Sandiford  <rsandifo@redhat.com>
+
+	* gcc.dg/torture/mips-div-1.c: New test.
+
 2004-06-24  Jeff Law  <law@redhat.com>
 
 	* gcc.dg/tree-ssa/20040624-1.c: New test.

gcc/testsuite/gcc.dg/torture/mips-div-1.c

+/* Check that hard-float MIPS code doesn't use library calls for 1.0/x.  */
+/* { dg-options "-fno-delayed-branch" } */
+/* { dg-do compile { target mips*-*-* } } */
+
+float f1 (float x) { return 1.0f / x; }
+double f2 (double x) { return 1.0 / x; }
+
+/* { dg-final { scan-assembler-not {lwc1.*__divsf3} } } */
+/* { dg-final { scan-assembler-not {ldc1.*__divdf3} } } */