i386: Check red zone size in push peephole2

Check red zone size, instead of if red zone is available, in push
peephole2s.

gcc/

	PR target/82499
	* config/i386/i386.h (ix86_red_zone_size): New.
	* config/i386/i386.md (push peephole2s): Replace
	"!ix86_using_red_zone ()" with "ix86_red_zone_size == 0".

gcc/testsuite/

	PR target/82499
	* gcc.target/i386/pr82499-1.c: New file.
	* gcc.target/i386/pr82499-2.c: Likewise.
	* gcc.target/i386/pr82499-3.c: Likewise.

From-SVN: r253718

gcc/ChangeLog

+2017-10-13  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/82499
+	* config/i386/i386.h (ix86_red_zone_size): New.
+	* config/i386/i386.md (push peephole2s): Replace
+	"!ix86_using_red_zone ()" with "ix86_red_zone_size == 0".
+
 2017-10-13  Richard Sandiford  <richard.sandiford@linaro.org>
 	    Alan Hayward  <alan.hayward@arm.com>
 	    David Sherwood  <david.sherwood@arm.com>

gcc/config/i386/i386.h

@@ -2603,6 +2603,7 @@ struct GTY(()) machine_function {
 #define ix86_current_function_calls_tls_descriptor \
   (ix86_tls_descriptor_calls_expanded_in_cfun && df_regs_ever_live_p (SP_REG))
 #define ix86_static_chain_on_stack (cfun->machine->static_chain_on_stack)
+#define ix86_red_zone_size (cfun->machine->frame.red_zone_size)
 
 /* Control behavior of x86_file_start.  */
 #define X86_FILE_START_VERSION_DIRECTIVE false

gcc/config/i386/i386.md

@@ -18814,7 +18814,7 @@
 	      (clobber (mem:BLK (scratch)))])]
   "(TARGET_SINGLE_PUSH || optimize_insn_for_size_p ())
    && INTVAL (operands[0]) == -GET_MODE_SIZE (word_mode)
-   && !ix86_using_red_zone ()"
+   && ix86_red_zone_size == 0"
   [(clobber (match_dup 1))
    (parallel [(set (mem:W (pre_dec:P (reg:P SP_REG))) (match_dup 1))
 	      (clobber (mem:BLK (scratch)))])])
@@ -18828,7 +18828,7 @@
 	      (clobber (mem:BLK (scratch)))])]
   "(TARGET_DOUBLE_PUSH || optimize_insn_for_size_p ())
    && INTVAL (operands[0]) == -2*GET_MODE_SIZE (word_mode)
-   && !ix86_using_red_zone ()"
+   && ix86_red_zone_size == 0"
   [(clobber (match_dup 1))
    (set (mem:W (pre_dec:P (reg:P SP_REG))) (match_dup 1))
    (parallel [(set (mem:W (pre_dec:P (reg:P SP_REG))) (match_dup 1))
@@ -18843,7 +18843,7 @@
 	      (clobber (reg:CC FLAGS_REG))])]
   "(TARGET_SINGLE_PUSH || optimize_insn_for_size_p ())
    && INTVAL (operands[0]) == -GET_MODE_SIZE (word_mode)
-   && !ix86_using_red_zone ()"
+   && ix86_red_zone_size == 0"
   [(clobber (match_dup 1))
    (set (mem:W (pre_dec:P (reg:P SP_REG))) (match_dup 1))])
 
@@ -18855,7 +18855,7 @@
 	      (clobber (reg:CC FLAGS_REG))])]
   "(TARGET_DOUBLE_PUSH || optimize_insn_for_size_p ())
    && INTVAL (operands[0]) == -2*GET_MODE_SIZE (word_mode)
-   && !ix86_using_red_zone ()"
+   && ix86_red_zone_size == 0"
   [(clobber (match_dup 1))
    (set (mem:W (pre_dec:P (reg:P SP_REG))) (match_dup 1))
    (set (mem:W (pre_dec:P (reg:P SP_REG))) (match_dup 1))])

gcc/testsuite/ChangeLog

+2017-10-13  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/82499
+	* gcc.target/i386/pr82499-1.c: New file.
+	* gcc.target/i386/pr82499-2.c: Likewise.
+	* gcc.target/i386/pr82499-3.c: Likewise.
+
 2017-10-13  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/82524

gcc/testsuite/gcc.target/i386/pr82499-1.c

+/* { dg-do compile } */
+/* The pic register save adds unavoidable stack pointer references.  */
+/* { dg-skip-if "" { ia32 && { ! nonpic } } } */
+/* These options are selected to ensure 1 word needs to be allocated
+   on the stack to maintain alignment for the call.  This should be
+   transformed to push+pop.  We also want to force unwind info updates.  */
+/* { dg-options "-Os -fomit-frame-pointer -fasynchronous-unwind-tables" } */
+/* { dg-additional-options "-mpreferred-stack-boundary=3" { target ia32 } } */
+/* { dg-additional-options "-mpreferred-stack-boundary=4" { target { ! ia32 } } } */
+/* ms_abi has reserved stack-region.  */
+/* { dg-skip-if "" { x86_64-*-mingw* } } */
+
+extern void g (void);
+int
+f (void)
+{
+  g ();
+  return 42;
+}
+
+/* { dg-final { scan-assembler-not "(sub|add)(l|q)\[\\t \]*\\$\[0-9\]*,\[\\t \]*%\[re\]?sp" } } */

gcc/testsuite/gcc.target/i386/pr82499-2.c

+/* { dg-do compile } */
+/* The pic register save adds unavoidable stack pointer references.  */
+/* { dg-skip-if "" { ia32 && { ! nonpic } } } */
+/* These options are selected to ensure 1 word needs to be allocated
+   on the stack to maintain alignment for the call.  This should be
+   transformed to push+pop.  We also want to force unwind info updates.  */
+/* { dg-options "-Os -fomit-frame-pointer -fasynchronous-unwind-tables" } */
+/* { dg-additional-options "-mpreferred-stack-boundary=3" { target ia32 } } */
+/* { dg-additional-options "-mpreferred-stack-boundary=4 -mno-red-zone" { target { ! ia32 } } } */
+/* ms_abi has reserved stack-region.  */
+/* { dg-skip-if "" { x86_64-*-mingw* } } */
+
+extern void g (void);
+int
+f (void)
+{
+  g ();
+  return 42;
+}
+
+/* { dg-final { scan-assembler-not "(sub|add)(l|q)\[\\t \]*\\$\[0-9\]*,\[\\t \]*%\[re\]?sp" } } */

gcc/testsuite/gcc.target/i386/pr82499-3.c

+/* { dg-do compile } */
+/* The pic register save adds unavoidable stack pointer references.  */
+/* { dg-skip-if "" { ia32 && { ! nonpic } } } */
+/* These options are selected to ensure 1 word needs to be allocated
+   on the stack to maintain alignment for the call.  This should be
+   transformed to push+pop.  We also want to force unwind info updates.  */
+/* { dg-options "-O2 -mtune-ctrl=single_push,single_pop -fomit-frame-pointer -fasynchronous-unwind-tables" } */
+/* { dg-additional-options "-mpreferred-stack-boundary=3" { target ia32 } } */
+/* { dg-additional-options "-mpreferred-stack-boundary=4" { target { ! ia32 } } } */
+/* ms_abi has reserved stack-region.  */
+/* { dg-skip-if "" { x86_64-*-mingw* } } */
+
+extern void g (void);
+int
+f (void)
+{
+  g ();
+  return 42;
+}
+
+/* { dg-final { scan-assembler-not "(sub|add)(l|q)\[\\t \]*\\$\[0-9\]*,\[\\t \]*%\[re\]?sp" } } */