Hello,
The following patch helps GCC to generate xch instruction.
The patch is being useful in many test cases from c-torture, for example in
gcc.c-torture/execute/pr52760.c
xch is being generated 4 times in foo and the code size for foo is being
reduced from 94 to 58 bytes.
Regression test is OK, tested with the following command:
make -k check-gcc RUNTESTFLAGS=--target_board=rl78-sim
Please let me know if this is OK, Thank you!
Sebastian
Index: ChangeLog
===================================================================
--- ChangeLog (revision 255581)
+++ ChangeLog (working copy)
@@ -1,3 +1,9 @@
+2017-12-12 Sebastian Perta <sebastian.pe...@renesas.com>
+
+ * config/rl78/rl78-expand.md: New define_expand "bswaphi2"
+ * config/rl78/rl78-virt.md: New define_insn "*bswaphi2_virt"
+ * config/rl78/rl78-real.md: New define_insn "*bswaphi2_real"
+
2017-12-12 Richard Biener <rguent...@suse.de>
PR tree-optimization/83385
Index: config/rl78/rl78-expand.md
===================================================================
--- config/rl78/rl78-expand.md (revision 255581)
+++ config/rl78/rl78-expand.md (working copy)
@@ -105,6 +105,14 @@
[(set_attr "valloc" "op1")]
)
+(define_expand "bswaphi2"
+ [(set (match_operand:HI 0 "nonimmediate_operand")
+ (bswap:HI (match_operand:HI 1 "general_operand")))]
+ ""
+ "if (rl78_force_nonfar_2 (operands, gen_bswaphi2))
+ DONE;"
+)
+
;;---------- Conversions ------------------------
(define_expand "zero_extendqihi2"
Index: config/rl78/rl78-real.md
===================================================================
--- config/rl78/rl78-real.md (revision 255581)
+++ config/rl78/rl78-real.md (working copy)
@@ -90,6 +90,15 @@
movw\t%0, %1"
)
+(define_insn "*bswaphi2_real"
+ [(set (match_operand:HI 0 "rl78_nonfar_nonimm_operand" "=A,A")
+ (bswap:HI (match_operand:HI 1 "general_operand" "0,viU")))]
+ "rl78_real_insns_ok ()"
+ "@
+ xch\ta, x
+ movw\tax, %1\n\txch\ta, x"
+)
+
;;---------- Conversions ------------------------
(define_insn "*zero_extendqihi2_real"
Index: config/rl78/rl78-virt.md
===================================================================
--- config/rl78/rl78-virt.md (revision 255581)
+++ config/rl78/rl78-virt.md (working copy)
@@ -65,6 +65,14 @@
[(set_attr "valloc" "op1")]
)
+(define_insn "*bswaphi2_virt"
+ [(set (match_operand:HI 0 "rl78_nonfar_nonimm_operand" "=vm")
+ (bswap:HI (match_operand:HI 1 "general_operand" "vim")))]
+ "rl78_virt_insns_ok ()"
+ "v.bswaphi\t%0, %1"
+ [(set_attr "valloc" "op1")]
+)
+
;;---------- Conversions ------------------------
(define_insn "*zero_extendqihi2_virt"
