diff mbox

[AARCH64] mov<mode>cc for fcsel

Message ID CACgzC7DnG4r9UCLrqcJHxDdosGm8h4yL_yP9gxH4+eZxt=fdTA@mail.gmail.com
State New
Headers show

Commit Message

Zhenqiang Chen March 18, 2014, 8:16 a.m. UTC 
Hi,

For float value, movsfcc/movdfcc is required by emit_conditional_move
called in ifcvt pass to expand if-then-else to "fcsel" insn.

Bootstrap and no make check regression with qemu-aarch64.

Is it OK for next stage1?

Thanks!
-Zhenqiang

ChangeLog:
2014-03-18  Zhenqiang Chen  <zhenqiang.chen@linaro.org>

    * config/aarch64/aarch64.md (mov<mode>cc): New for GPF.

testsuite/ChangeLog:
2014-03-18  Zhenqiang Chen  <zhenqiang.chen@linaro.org>

    * gcc.target/aarch64/fcsel.c: New test case.
diff mbox

Patch

diff --git a/gcc/config/aarch64/aarch64.md b/gcc/config/aarch64/aarch64.md
index 99a6ac8..0f4b8ebf 100644
--- a/gcc/config/aarch64/aarch64.md
+++ b/gcc/config/aarch64/aarch64.md
@@ -2344,6 +2344,25 @@ 
   }
 )

+(define_expand "mov<mode>cc"
+  [(set (match_operand:GPF 0 "register_operand" "")
+    (if_then_else:GPF (match_operand 1 "aarch64_comparison_operator" "")
+              (match_operand:GPF 2 "register_operand" "")
+              (match_operand:GPF 3 "register_operand" "")))]
+  ""
+  {
+    rtx ccreg;
+    enum rtx_code code = GET_CODE (operands[1]);
+
+    if (code == UNEQ || code == LTGT)
+      FAIL;
+
+    ccreg = aarch64_gen_compare_reg (code, XEXP (operands[1], 0),
+                  XEXP (operands[1], 1));
+    operands[1] = gen_rtx_fmt_ee (code, VOIDmode, ccreg, const0_rtx);
+  }
+)
+
 (define_insn "*csinc2<mode>_insn"
   [(set (match_operand:GPI 0 "register_operand" "=r")
         (plus:GPI (match_operator:GPI 2 "aarch64_comparison_operator"
diff --git a/gcc/testsuite/gcc.target/aarch64/fcsel.c
b/gcc/testsuite/gcc.target/aarch64/fcsel.c
new file mode 100644
index 0000000..9c5431a
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/fcsel.c
@@ -0,0 +1,20 @@ 
+/* { dg-do compile } */
+/* { dg-options " -O2 " } */
+
+float f1 (float a, float b, float c, float d)
+{
+  if (a > 0.0)
+    return c;
+  else
+    return 2.0;
+}
+
+double f2 (double a, double b, double c, double d)
+{
+  if (a > b)
+    return c;
+  else
+    return d;
+}
+
+/* { dg-final { scan-assembler-times "\tfcsel" 2 } } */