s390x: use constraints for call arguments and return values (#5092)

Use the regalloc constraint-based CallArgList / CallRetList
mechanism instead of directly using physregs in instructions.

cranelift/filetests/filetests/isa/s390x/call.clif

@@ -35,8 +35,8 @@ block0(v0: i32):
 ;   virtual_sp_offset_adjust 160
 ; block0:
 ;   llgfr %r2, %r2
-;   bras %r1, 12 ; data %g + 0 ; lg %r3, 0(%r1)
-;   basr %r14, %r3
+;   bras %r1, 12 ; data %g + 0 ; lg %r4, 0(%r1)
+;   basr %r14, %r4
 ;   lmg %r14, %r15, 272(%r15)
 ;   br %r14
 
@@ -63,8 +63,8 @@ block0(v0: i32):
 ;   virtual_sp_offset_adjust 160
 ; block0:
 ;   lgfr %r2, %r2
-;   bras %r1, 12 ; data %g + 0 ; lg %r3, 0(%r1)
-;   basr %r14, %r3
+;   bras %r1, 12 ; data %g + 0 ; lg %r4, 0(%r1)
+;   basr %r14, %r4
 ;   lmg %r14, %r15, 272(%r15)
 ;   br %r14
 
@@ -107,8 +107,8 @@ block0(v0: i32):
 ;   virtual_sp_offset_adjust 160
 ; block0:
 ;   llgfr %r2, %r2
-;   bras %r1, 12 ; data %g + 0 ; lg %r3, 0(%r1)
-;   basr %r14, %r3
+;   bras %r1, 12 ; data %g + 0 ; lg %r4, 0(%r1)
+;   basr %r14, %r4
 ;   lmg %r14, %r15, 272(%r15)
 ;   br %r14
 

cranelift/filetests/filetests/isa/s390x/reftypes.clif

@@ -69,15 +69,15 @@ block3(v7: r64, v8: r64):
 ;   aghi %r15, -184
 ;   virtual_sp_offset_adjust 160
 ; block0:
-;   stg %r3, 176(%r15)
 ;   stg %r2, 168(%r15)
-;   bras %r1, 12 ; data %f + 0 ; lg %r3, 0(%r1)
-;   basr %r14, %r3
-;   la %r5, 160(%r15)
+;   stg %r3, 176(%r15)
+;   bras %r1, 12 ; data %f + 0 ; lg %r5, 0(%r1)
+;   basr %r14, %r5
+;   la %r4, 160(%r15)
 ;   lg %r3, 168(%r15)
-;   stg %r3, 0(%r5)
-;   lbr %r2, %r2
-;   chi %r2, 0
+;   stg %r3, 0(%r4)
+;   lbr %r5, %r2
+;   chi %r5, 0
 ;   jgnlh label1 ; jg label3
 ; block1:
 ;   jg label2

cranelift/filetests/filetests/isa/s390x/struct-arg.clif

@@ -103,22 +103,22 @@ block0(v0: i64, v1: i64, v2: i64):
     return v3
 }
 
-;   stmg %r7, %r15, 56(%r15)
+;   stmg %r8, %r15, 64(%r15)
 ;   aghi %r15, -1248
 ;   virtual_sp_offset_adjust 1248
 ; block0:
-;   lgr %r7, %r2
-;   lgr %r9, %r4
+;   lgr %r8, %r2
+;   lgr %r10, %r4
 ;   la %r2, 160(%r15)
 ;   la %r3, 0(%r3)
 ;   lghi %r4, 1024
 ;   brasl %r14, %Memcpy
-;   lgr %r4, %r9
+;   lgr %r4, %r10
 ;   mvc 1184(63,%r15), 0(%r4)
-;   lgr %r2, %r7
 ;   la %r3, 160(%r15)
 ;   la %r4, 1184(%r15)
+;   lgr %r2, %r8
 ;   brasl %r14, userextname0
-;   lmg %r7, %r15, 1304(%r15)
+;   lmg %r8, %r15, 1312(%r15)
 ;   br %r14
 

cranelift/filetests/filetests/isa/s390x/tls_elf.clif

@@ -18,9 +18,9 @@ block0(v0: i32):
 ;   bras %r1, 12 ; data userextname0@tlsgd ; lg %r2, 0(%r1)
 ;   brasl %r14, %ElfTlsGetOffset:tls_gdcall:userextname0
 ;   ear %r3, %a0
-;   sllg %r5, %r3, 32
-;   ear %r5, %a1
-;   agr %r2, %r5
+;   sllg %r3, %r3, 32
+;   ear %r3, %a1
+;   agr %r2, %r3
 ;   lmg %r12, %r15, 256(%r15)
 ;   br %r14
 

cranelift/filetests/filetests/isa/s390x/vec-abi.clif

@@ -13,8 +13,8 @@ block0(v0: i64x2, v1: i32x4, v2: i16x8, v3: i8x16):
 ;   aghi %r15, -160
 ;   virtual_sp_offset_adjust 160
 ; block0:
-;   bras %r1, 12 ; data %callee_be + 0 ; lg %r4, 0(%r1)
-;   basr %r14, %r4
+;   bras %r1, 12 ; data %callee_be + 0 ; lg %r5, 0(%r1)
+;   basr %r14, %r5
 ;   lmg %r14, %r15, 272(%r15)
 ;   br %r14
 
@@ -39,19 +39,19 @@ block0(v0: i64x2, v1: i32x4, v2: i16x8, v3: i8x16):
 ;   std %f15, 216(%r15)
 ; block0:
 ;   vpdi %v24, %v24, %v24, 4
-;   vpdi %v17, %v25, %v25, 4
-;   verllg %v25, %v17, 32
-;   vpdi %v22, %v26, %v26, 4
-;   verllg %v26, %v22, 32
-;   verllf %v26, %v26, 16
-;   vpdi %v29, %v27, %v27, 4
-;   verllg %v31, %v29, 32
-;   verllf %v1, %v31, 16
-;   verllh %v27, %v1, 8
-;   bras %r1, 12 ; data %callee_le + 0 ; lg %r4, 0(%r1)
-;   basr %r14, %r4
-;   vpdi %v19, %v24, %v24, 4
-;   verllg %v24, %v19, 32
+;   vpdi %v16, %v25, %v25, 4
+;   verllg %v25, %v16, 32
+;   vpdi %v20, %v26, %v26, 4
+;   verllg %v22, %v20, 32
+;   verllf %v26, %v22, 16
+;   vpdi %v27, %v27, %v27, 4
+;   verllg %v28, %v27, 32
+;   verllf %v30, %v28, 16
+;   verllh %v27, %v30, 8
+;   bras %r1, 12 ; data %callee_le + 0 ; lg %r5, 0(%r1)
+;   basr %r14, %r5
+;   vpdi %v6, %v24, %v24, 4
+;   verllg %v24, %v6, 32
 ;   ld %f8, 160(%r15)
 ;   ld %f9, 168(%r15)
 ;   ld %f10, 176(%r15)
@@ -84,19 +84,19 @@ block0(v0: i64x2, v1: i32x4, v2: i16x8, v3: i8x16):
 ;   std %f15, 216(%r15)
 ; block0:
 ;   vpdi %v24, %v24, %v24, 4
-;   vpdi %v17, %v25, %v25, 4
-;   verllg %v25, %v17, 32
-;   vpdi %v22, %v26, %v26, 4
-;   verllg %v26, %v22, 32
-;   verllf %v26, %v26, 16
-;   vpdi %v29, %v27, %v27, 4
-;   verllg %v31, %v29, 32
-;   verllf %v1, %v31, 16
-;   verllh %v27, %v1, 8
-;   bras %r1, 12 ; data %callee_be + 0 ; lg %r4, 0(%r1)
-;   basr %r14, %r4
-;   vpdi %v19, %v24, %v24, 4
-;   verllg %v24, %v19, 32
+;   vpdi %v16, %v25, %v25, 4
+;   verllg %v25, %v16, 32
+;   vpdi %v20, %v26, %v26, 4
+;   verllg %v22, %v20, 32
+;   verllf %v26, %v22, 16
+;   vpdi %v27, %v27, %v27, 4
+;   verllg %v28, %v27, 32
+;   verllf %v30, %v28, 16
+;   verllh %v27, %v30, 8
+;   bras %r1, 12 ; data %callee_be + 0 ; lg %r5, 0(%r1)
+;   basr %r14, %r5
+;   vpdi %v6, %v24, %v24, 4
+;   verllg %v24, %v6, 32
 ;   ld %f8, 160(%r15)
 ;   ld %f9, 168(%r15)
 ;   ld %f10, 176(%r15)
@@ -120,8 +120,8 @@ block0(v0: i64x2, v1: i32x4, v2: i16x8, v3: i8x16):
 ;   aghi %r15, -160
 ;   virtual_sp_offset_adjust 160
 ; block0:
-;   bras %r1, 12 ; data %callee_le + 0 ; lg %r4, 0(%r1)
-;   basr %r14, %r4
+;   bras %r1, 12 ; data %callee_le + 0 ; lg %r5, 0(%r1)
+;   basr %r14, %r5
 ;   lmg %r14, %r15, 272(%r15)
 ;   br %r14