Hello!
Attached patch adds new insn_and_split pattern to handle pre_modify
XFmode push variant. -m96bit-long-double option sets XFmode size to 12
bytes that is not divisible with push size (8 bytes), resulting in
pre_modify push variant.
2017-03-02 Uros Bizjak <ubiz...@gmail.com>
PR target/79514
* config/i386/i386.md (*pushxf_rounded): New insn_and_split pattern.
testsuite/ChangeLog:
2017-03-02 Uros Bizjak <ubiz...@gmail.com>
PR target/79514
* gcc.target/i386/pr79514.c: New test.
Bootstrapped and regression tested on x86_64-linux-gnu {,-m32}.
Committed to mainline, will be backported to release branches.
Uros.
Index: config/i386/i386.md
===================================================================
--- config/i386/i386.md (revision 245842)
+++ config/i386/i386.md (working copy)
@@ -3015,6 +3015,36 @@
operands[0] = replace_equiv_address (operands[0], stack_pointer_rtx);
})
+(define_insn_and_split "*pushxf_rounded"
+ [(set (mem:XF
+ (pre_modify:DI
+ (reg:DI SP_REG)
+ (plus:DI (reg:DI SP_REG) (const_int -16))))
+ (match_operand:XF 0 "nonmemory_no_elim_operand" "f,r,*r,C"))]
+ "TARGET_64BIT"
+ "#"
+ "&& 1"
+ [(set (reg:DI SP_REG) (plus:DI (reg:DI SP_REG) (const_int -16)))
+ (set (match_dup 1) (match_dup 0))]
+{
+ rtx pat = PATTERN (curr_insn);
+ operands[1] = SET_DEST (pat);
+
+ /* Preserve memory attributes. */
+ operands[1] = replace_equiv_address (operands[1], stack_pointer_rtx);
+}
+ [(set_attr "type" "multi")
+ (set_attr "unit" "i387,*,*,*")
+ (set (attr "mode")
+ (cond [(eq_attr "alternative" "1,2,3")
+ (const_string "DI")
+ ]
+ (const_string "XF")))
+ (set (attr "preferred_for_size")
+ (cond [(eq_attr "alternative" "1")
+ (symbol_ref "false")]
+ (symbol_ref "true")))])
+
(define_insn "*pushxf"
[(set (match_operand:XF 0 "push_operand" "=<,<,<,<")
(match_operand:XF 1 "general_no_elim_operand" "f,r,*r,oF"))]
Index: testsuite/gcc.target/i386/pr79514.c
===================================================================
--- testsuite/gcc.target/i386/pr79514.c (nonexistent)
+++ testsuite/gcc.target/i386/pr79514.c (working copy)
@@ -0,0 +1,12 @@
+/* PR target/79514 */
+/* { dg-do compile } */
+/* { dg-options "-m96bit-long-double" } */
+
+extern void bar (long double);
+
+extern long double x;
+
+void foo (void)
+{
+ bar (x);
+}
