exp_ch4.adb (Expand_N_Op_Expon): Force evaluation of left argument even when right argument is 0.

2008-08-10  Samuel Tardieu  <sam@rfc1149.net>
            Robert Dewar <dewar@adacore.com>
    gcc/ada/
	* exp_ch4.adb (Expand_N_Op_Expon): Force evaluation of
	left argument even when right argument is 0.
	(Expand_N_Op_Mod): Ditto when right argument is 1.
	(Expand_N_Op_Multiply): Ditto when any argument is 0.
	(Expand_N_Op_Rem): Ditto when right argument is 1.

2008-08-10  Samuel Tardieu  <sam@rfc1149.net>
    gcc/testsuite/
	* gnat.dg/exp0_eval.adb: New.

Co-Authored-By: Robert Dewar <dewar@adacore.com>

From-SVN: r138934

1 files changed, 31 insertions, 0 deletions

diff --git a/gcc/testsuite/gnat.dg/exp0_eval.adb b/gcc/testsuite/gnat.dg/exp0_eval.adb
new file mode 100644
index 0000000..11edd7d
--- /dev/null
+++ b/gcc/testsuite/gnat.dg/exp0_eval.adb
@@ -0,0 +1,31 @@
+-- { dg-do run }
+with Interfaces; use Interfaces;
+procedure Exp0_Eval is
+
+   F_Count : Natural := 0;
+
+   function F return Integer is
+   begin
+      F_Count := F_Count + 1;
+      return 1;
+   end F;
+
+   function F return Unsigned_32 is
+   begin
+      F_Count := F_Count + 1;
+      return 1;
+   end F;
+
+   R : constant Integer :=
+     F ** 0 +
+     F * 0 +
+     0 * F +
+     Integer (Unsigned_32'(F) mod 1) +
+     Integer (Unsigned_32'(F) rem 1);
+   pragma Warnings (Off, R);
+begin
+   if F_Count /= 5 then
+      raise Program_Error
+        with "incorrect numbers of calls to F:" & F_Count'Img;
+   end if;
+end Exp0_Eval;