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From: David Holsgrove <david.holsgrove@xilinx.com>
Subject: [PATCH] [Patch, microblaze]: Fix bswaphi2 implementation
MicroBlaze insn swaph swaps the contents of register rA
as two halfwords placing result in rD;
(rD)[0:15] <- (rA)[16:31]
(rD)[16:31] <- (rA)[0:15]
gcc bswaphi2 is intended to reverse the order of the bytes
in the half integer in rA
(rD)[8:15] <- (rA)[0:7]
(rD)[7:0] <- (rA)[8:15]
(rD)[24:31] <- (rA)[16:23]
(rD)[16:23] <- (rA)[24:31]
Correct microblaze bswaphi2 insn pattern to be a
swapb followed by swaph
Reported-by: Nathan Rossi <nathan.rossi@xilinx.com>
Signed-off-by: David Holsgrove <david.holsgrove@xilinx.com>
Upstream-Status: Pending
---
gcc/config/microblaze/microblaze.md | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/gcc/config/microblaze/microblaze.md b/gcc/config/microblaze/microblaze.md
index ae4ade7..c7485fc 100644
--- a/gcc/config/microblaze/microblaze.md
+++ b/gcc/config/microblaze/microblaze.md
@@ -367,7 +367,8 @@
[(set (match_operand:HI 0 "register_operand" "=r")
(bswap:HI (match_operand:HI 1 "register_operand" "r")))]
"TARGET_REORDER"
- "swaph %0, %1"
+ "swapb %0, %1
+ swaph %0, %0"
)
;;----------------------------------------------------------------
--
1.7.1
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