PR target/66813

	* config/i386/i386.c (ix86_md_asm_adjust): Emit movstrictqi
	sequence for TARGET_ZERO_EXTEND_WITH_AND targets.

testsuite/ChangeLog:

	PR target/66813
	* gcc.target/i386/pr66813.c: New test.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@225662 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index e3b8d27da864bcd665a444a2d1643dfbeb05ee47..f305c72481ab40ca9f0a23e887e579a19312b303 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2015-07-10  Uros Bizjak  <ubizjak@gmail.com>
+
+       PR target/66813
+       * config/i386/i386.c (ix86_md_asm_adjust): Emit movstrictqi
+       sequence for TARGET_ZERO_EXTEND_WITH_AND targets.
+
 2015-07-10  Jakub Jelinek  <jakub@redhat.com>
 
        PR middle-end/66820

diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index a18c733d21120e4a283b7c168d8705a891235f4b..007e0e13955ce9414275321dad1f2dd793cde9c6 100644 (file)
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -45842,7 +45842,17 @@ ix86_md_asm_adjust (vec<rtx> &outputs, vec<rtx> &/*inputs*/,
        {
          rtx destqi = gen_reg_rtx (QImode);
          emit_insn (gen_rtx_SET (destqi, x));
-         x = gen_rtx_ZERO_EXTEND (dest_mode, destqi);
+
+         if (TARGET_ZERO_EXTEND_WITH_AND
+             && optimize_function_for_speed_p (cfun))
+           {
+             x = force_reg (dest_mode, const0_rtx);
+
+             emit_insn (gen_movstrictqi
+                        (gen_lowpart (QImode, x), destqi));
+           }
+         else
+           x = gen_rtx_ZERO_EXTEND (dest_mode, destqi);
        }
       emit_insn (gen_rtx_SET (dest, x));
     }

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 04c64c45ff930cb2b24b441a75380112762366ea..237827575488de40e2427e3ff03b2bf4f492ee25 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2015-07-10  Uros Bizjak  <ubizjak@gmail.com>
+
+       PR target/66813
+       * gcc.target/i386/pr66813.c: New test.
+
 2015-07-10  Jakub Jelinek  <jakub@redhat.com>
 
        PR middle-end/66820

diff --git a/gcc/testsuite/gcc.target/i386/pr66813.c b/gcc/testsuite/gcc.target/i386/pr66813.c
new file mode 100644 (file)
index 0000000..d4d8cc6
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr66813.c
@@ -0,0 +1,5 @@
+/* { dg-do compile { target { ia32 } } } */
+/* { dg-options "-march=pentium" } */
+
+void f_s(void) { short x; asm("" : "=@ccc"(x)); }
+void f_i(void) { int x; asm("" : "=@ccc"(x)); }