travis: disable some tests for faster build testing

(cherry picked from commit 5267093)

gas64: fix check
(cherry picked from commit 350fd28)

gas64: fix internal check

- returning structure values in registers true only if type is non-pointer struct
(cherry picked from commit 4d177a8)

Merge pull request #260 from jayrm/fbc-gas64

change gas64 internal checks for structs returned in registers on linux
(cherry picked from commit fbedc0a)

Revert "travis: disable some tests for faster build testing"

This reverts commit 5267093.
(cherry picked from commit 24d25c6)

Revert "gas64: fix internal check"

This reverts commit 4d177a8.

Revert "gas64: fix check"

This reverts commit 350fd28.
(cherry picked from commit 83217e8)

gas64: check if structure is returned in 2 registers

- add hIsStructIn2Regs() internal function
- add comments in hGetReturnTypeGas64Linux()
(cherry picked from commit e973a9f)

gas64: invert test for SSE 41 feature flag
(cherry picked from commit c15753f)

Merge pull request #261 from jayrm/fbc-gas64

gas64: check if structure is returned in 2 registers for linux
(cherry picked from commit 91ff104)

Author: jayrm

src/compiler/ir-gas64.bas

@@ -4418,7 +4418,7 @@ private sub _emitconvert( byval v1 as IRVREG ptr, byval v2 as IRVREG ptr )
 				ctx.roundfloat=true
 				asm_code("test DWORD PTR $sse41[rip], 0")
 				lname1 = *symbUniqueLabel( )
-				asm_code("jne "+lname1)
+				asm_code("je "+lname1)
 				asm_code("roundsd xmm0,xmm0,4") ''nearbyintf double
 				lname2 = *symbUniqueLabel( )
 				asm_code("jmp "+lname2)
@@ -4461,7 +4461,7 @@ private sub _emitconvert( byval v1 as IRVREG ptr, byval v2 as IRVREG ptr )
 				ctx.roundfloat=true
 				asm_code("test DWORD PTR $sse41[rip], 0")
 				lname1 = *symbUniqueLabel( )
-				asm_code("jne "+lname1)
+				asm_code("je "+lname1)
 				asm_code("roundsd xmm0,xmm0,4") ''nearbyintf double
 				asm_code("cvttsd2si rax, xmm0")
 				lname2 = *symbUniqueLabel( )
@@ -4499,7 +4499,7 @@ private sub _emitconvert( byval v1 as IRVREG ptr, byval v2 as IRVREG ptr )
 				ctx.roundfloat=true
 				asm_code("test DWORD PTR $sse41[rip], 0")
 				lname1 = *symbUniqueLabel( )
-				asm_code("jne "+lname1)
+				asm_code("je "+lname1)
 				asm_code("roundss xmm0,xmm0,4")
 				lname2 = *symbUniqueLabel( )
 				asm_code("jmp "+lname2)
@@ -4542,7 +4542,7 @@ private sub _emitconvert( byval v1 as IRVREG ptr, byval v2 as IRVREG ptr )
 				ctx.roundfloat=true
 				asm_code("test DWORD PTR $sse41[rip], 0")
 				lname1 = *symbUniqueLabel( )
-				asm_code("jne "+lname1)
+				asm_code("je "+lname1)
 				asm_code("roundss xmm0,xmm0,4") ''nearbyintf single
 				asm_code("cvttss2si rax, xmm0")
 				lname2 = *symbUniqueLabel( )
@@ -4742,6 +4742,21 @@ private sub emitStoreStruct(byval v1 as IRVREG ptr, byval v2 as IRVREG ptr,byref
             asm_code("mov [rax], rdx")
     end select
 end sub
+
+private function hIsStructIn2Regs( byval v1 as IRVREG ptr ) as integer
+	'' test if the VREG is for a struct that would be returned in 2 registers
+	'' sym->udt.retin2regs is set by symbStructEnd() and the udt should become
+	'' the subtype of the vreg.
+
+	'' only if the type is a UDT
+	if( typeGetDtAndPtrOnly( v1->dtype ) = FB_DATATYPE_STRUCT ) then
+		
+		'' only if the UDT was analyzed to return in 2 registers
+		return ( v1->subtype->udt.retin2regs <> FB_STRUCT_NONE )
+	end if
+	return FALSE
+end function
+
 private sub _emitstore( byval v1 as IRVREG ptr, byval v2 as IRVREG ptr )
 
     dim as string op1,op2,op3,op4,prefix,code1,code2,regtempo
@@ -4821,10 +4836,10 @@ private sub _emitstore( byval v1 as IRVREG ptr, byval v2 as IRVREG ptr )
             asm_error("store 01")
     end select
 
-    if v2->subtype<>0 andalso typeIsPtr( v2->dtype )=false andalso v2->subtype->udt.retin2regs<>FB_STRUCT_NONE then
-		'' for Linux structures can be returned in 2 registers so needs a special handling
+    if( hIsStructIn2Regs( v2 ) ) then
+        '' for Linux structures can be returned in 2 registers so needs a special handling
         emitStoreStruct(v1,v2,op1,op3)
-		exit sub
+        exit sub
     end if
 
     ''SOURCE
@@ -5090,7 +5105,7 @@ private sub _emitloadres(byval v1 as IRVREG ptr,byval vr as IRVREG Ptr)
             asm_error("in loadres typ not handled")
     end select
 
-    if v1->sym<>0 andalso typeIsPtr( v1->dtype )=false andalso v1->sym->subtype<>0 andalso v1->sym->subtype->udt.retin2regs<>FB_STRUCT_NONE then
+    if( hIsStructIn2Regs( v1 ) ) then
         ''Structure returned in 2 registers, linux only
         ''assuming in this case fb$result is always defined like xxx[rbp]
         if v1->typ<>IR_VREGTYPE_VAR orelse ( symbIsStatic(v1->sym) Or symbisshared(v1->sym) )then
@@ -5852,7 +5867,8 @@ private sub hdocall(byval proc as FBSYMBOL ptr,byref pname as string,byref first
     ctx.proccalling=false
 
     if( vr ) then ''return value
-        if vr->subtype<>0 andalso typeIsPtr( vr->dtype )=false andalso vr->subtype->udt.retin2regs<>FB_STRUCT_NONE then
+
+        if( hIsStructIn2Regs( vr ) ) then 
             ''Structure returned in 2 registers
             vr->typ=IR_VREGTYPE_VAR ''for use when argument
             ctx.stk+=typeGetSize( FB_DATATYPE_LONGINT )*2 ''reserving 16 bytes

src/compiler/symb-struct.bas

@@ -670,7 +670,7 @@ sub struct_analyze(byval fld as FBSYMBOL ptr,byref part1 as integer,byref part2
 
 end sub
 
-private function hGetReturnTypeGas64Linux( byval sym as FBSYMBOL ptr ) as FB_STRUCT_INREG
+private function hGetReturnTypeGas64Linux( byval sym as FBSYMBOL ptr ) as integer
 
 	assert( env.clopt.backend = FB_BACKEND_GAS64 )
 	assert( env.clopt.target = FB_COMPTARGET_LINUX )
@@ -688,10 +688,12 @@ private function hGetReturnTypeGas64Linux( byval sym as FBSYMBOL ptr ) as FB_STR
 
 		select case as const part1+part2
 			case 1 ''only integers in RAX
-				'' return FB_STRUCT_R
+				'' don't set retin2regs, it's handled by datatype only 
+				'' sym->udt.retin2regs = FB_STRUCT_R
 				return FB_DATATYPE_LONGINT
 			case 2 ''only floats in XMM0
-				'' return FB_STRUCT_X
+				'' don't set retin2regs, it's handled by datatype only
+				'' sym->udt.retin2regs = FB_STRUCT_X
 				return FB_DATATYPE_DOUBLE
 			case 5 ''only integers in RAX/RDX
 				sym->udt.retin2regs = FB_STRUCT_RR