===================================================================
@@ -6218,7 +6218,7 @@
(define_insn "swapbsi2"
[(set (match_operand:SI 0 "arith_reg_dest" "=r")
(ior:SI (and:SI (match_operand:SI 1 "arith_reg_operand" "r")
- (const_int 4294901760))
+ (const_int -65536)) ;; 0xFFFF0000
(ior:SI (and:SI (ashift:SI (match_dup 1) (const_int 8))
(const_int 65280))
(and:SI (ashiftrt:SI (match_dup 1) (const_int 8))
@@ -6286,7 +6286,7 @@
(define_peephole2
[(set (match_operand:SI 0 "arith_reg_dest" "")
(ior:SI (and:SI (match_operand:SI 1 "arith_reg_operand" "")
- (const_int 4294901760))
+ (const_int -65536)) ;; 0xFFFF0000
(ior:SI (and:SI (ashift:SI (match_dup 1) (const_int 8))
(const_int 65280))
(and:SI (ashiftrt:SI (match_dup 1) (const_int 8))
@@ -6296,7 +6296,7 @@
"TARGET_SH1 && peep2_reg_dead_p (2, operands[0])"
[(set (match_dup 2)
(ior:SI (and:SI (match_operand:SI 1 "arith_reg_operand" "")
- (const_int 4294901760))
+ (const_int -65536)) ;; 0xFFFF0000
(ior:SI (and:SI (ashift:SI (match_dup 1) (const_int 8))
(const_int 65280))
(and:SI (ashiftrt:SI (match_dup 1) (const_int 8))
===================================================================
@@ -0,0 +1,22 @@
+/* PR target/65163 */
+
+typedef unsigned int uint32_t;
+typedef unsigned short uint16_t;
+union unaligned_32 { uint32_t l; } __attribute__((packed));
+union unaligned_16 { uint16_t l; } __attribute__((packed));
+
+int
+test_00 (unsigned char* buf, int bits_per_component)
+{
+ (((union unaligned_32*)(buf))->l) =
+ __builtin_bswap32 (bits_per_component == 10 ? 1 : 0);
+ return 0;
+}
+
+int
+test_01 (unsigned char* buf, int bits_per_component)
+{
+ (((union unaligned_16*)(buf))->l) =
+ __builtin_bswap16 (bits_per_component == 10 ? 1 : 0);
+ return 0;
+}
Hi, The attached patch fixes PR 65163. Although the problem started to show up on trunk and not on the 4.8 / 4.9 branches, I've also backported it, since it's a latent bug. Tested on trunk with make -k check RUNTESTFLAGS="--target_board=sh-sim \{-m2/-ml,-m2/-mb,-m2a/-mb,-m4/-ml,-m4/-mb,-m4a/-ml,-m4a/-mb}" and on the branches briefly with make -k check-gcc RUNTESTFLAGS="sh.exp --target_board=sh-sim \{-m2/-ml,-m2/-mb,-m2a/-mb,-m4/-ml,-m4/-mb,-m4a/-ml,-m4a/-mb}" Committed as r220916 (trunk), r220917 (4.9), r220918 (4.8). Cheers, Oleg gcc/ChangeLog: PR target/65163 * config/sh/sh.md (swapbsi2, related peephole2): Use const_int -65536 instead of const_int 4294901760. gcc/testsuite/ChangeLog: PR target/65163 * gcc.c-torture/compile/pr65163.c: New.