https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106069
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
The difference between r12-4495 and r12-4496:
$ diff -up b/q.C.252r.expand a/q.C.252r.expand
--- b/q.C.252r.expand 2022-06-23 23:16:44.753507476 +0000
+++ a/q.C.252r.expand 2022-06-23 23:16:16.232784087 +0000
@@ -831,10 +831,14 @@ try_optimize_cfg iteration 2
(subreg:V16QI (reg/v:V4SI 168 [ R02$m_simd ]) 0)) "q.C":31:47 -1
(nil))
(insn 188 187 189 5 (set (reg:V4SI 339)
- (unspec:V4SI [
- (subreg:V4SI (reg:V16QI 338) 0)
- (subreg:V4SI (reg:V16QI 337) 0)
- ] UNSPEC_VMRGL_DIRECT)) "q.C":31:47 -1
+ (vec_select:V4SI (vec_concat:V8SI (subreg:V4SI (reg:V16QI 338) 0)
+ (subreg:V4SI (reg:V16QI 337) 0))
+ (parallel [
+ (const_int 2 [0x2])
+ (const_int 6 [0x6])
+ (const_int 3 [0x3])
+ (const_int 7 [0x7])
+ ]))) "q.C":31:47 -1
(nil))
(insn 189 188 190 5 (set (reg:V16QI 336)
(subreg:V16QI (reg:V4SI 339) 0)) "q.C":31:47 -1
@@ -846,10 +850,14 @@ try_optimize_cfg iteration 2
(subreg:V16QI (reg/v:V4SI 143 [ val ]) 0)) "q.C":32:47 -1
(nil))
(insn 192 191 193 5 (set (reg:V4SI 344)
- (unspec:V4SI [
- (subreg:V4SI (reg:V16QI 343) 0)
- (subreg:V4SI (reg:V16QI 342) 0)
- ] UNSPEC_VMRGL_DIRECT)) "q.C":32:47 -1
+ (vec_select:V4SI (vec_concat:V8SI (subreg:V4SI (reg:V16QI 343) 0)
+ (subreg:V4SI (reg:V16QI 342) 0))
+ (parallel [
+ (const_int 2 [0x2])
+ (const_int 6 [0x6])
+ (const_int 3 [0x3])
+ (const_int 7 [0x7])
+ ]))) "q.C":32:47 -1
(nil))
(insn 193 192 194 5 (set (reg:V16QI 341)
(subreg:V16QI (reg:V4SI 344) 0)) "q.C":32:47 -1
@@ -861,10 +869,14 @@ try_optimize_cfg iteration 2
(subreg:V4SI (reg:V16QI 341) 0)) "q.C":35:8 -1
(nil))
(insn 196 195 197 5 (set (reg:V4SI 349)
- (unspec:V4SI [
- (subreg:V4SI (reg:V16QI 341) 0)
- (subreg:V4SI (reg:V16QI 336) 0)
- ] UNSPEC_VMRGL_DIRECT)) "q.C":35:8 -1
+ (vec_select:V4SI (vec_concat:V8SI (subreg:V4SI (reg:V16QI 341) 0)
+ (subreg:V4SI (reg:V16QI 336) 0))
+ (parallel [
+ (const_int 2 [0x2])
+ (const_int 6 [0x6])
+ (const_int 3 [0x3])
+ (const_int 7 [0x7])
+ ]))) "q.C":35:8 -1
(nil))
(insn 197 196 198 5 (set (reg:V16QI 348)
(subreg:V16QI (reg:V4SI 349) 0)) "q.C":35:8 -1
@@ -934,7 +946,7 @@ try_optimize_cfg iteration 2
(reg/f:DI 120)) "q.C":103:7 -1
(nil))
(call_insn 9 8 10 2 (parallel [
- (call (mem:SI (symbol_ref:DI ("_Z3fooPhPj") [flags 0x3]
<function_decl 0x3fff7f473a00 foo>) [0 foo S4 A8])
+ (call (mem:SI (symbol_ref:DI ("_Z3fooPhPj") [flags 0x3]
<function_decl 0x3fffa9823a00 foo>) [0 foo S4 A8])
(const_int 0 [0]))
(use (const_int 0 [0]))
(clobber (reg:DI 96 lr))
@@ -968,7 +980,7 @@ try_optimize_cfg iteration 2
-> 17)
(note 14 13 15 4 [bb 4] NOTE_INSN_BASIC_BLOCK)
(call_insn 15 14 16 4 (parallel [
- (call (mem:SI (symbol_ref:DI ("abort") [flags 0x41]
<function_decl 0x3fff7f2b5300 __builtin_abort>) [0 __builtin_abort S4 A8])
+ (call (mem:SI (symbol_ref:DI ("abort") [flags 0x41]
<function_decl 0x3fffa9665300 __builtin_abort>) [0 __builtin_abort S4 A8])
(const_int 0 [0]))
(use (const_int 0 [0]))
(clobber (reg:DI 96 lr))
