properly align long double on i386 darwin (#148102)

Fixes llvm/llvm-project#148034

e49fcfc broke long double stack
alignment on i386 Darwin, this PR fixes the issue.

Author: Un1q32

llvm/lib/Target/X86/X86CallingConv.td

@@ -832,6 +832,7 @@ def CC_X86_32_Common : CallingConv<[
   CCIfType<[f64], CCAssignToStack<8, 4>>,
 
   // Long doubles get slots whose size and alignment depends on the subtarget.
+  CCIfSubtarget<"isTargetDarwin()", CCIfType<[f80], CCAssignToStack<0, 4>>>,
   CCIfType<[f80], CCAssignToStack<0, 0>>,
 
   // Boolean vectors of AVX-512 are passed in SIMD registers.

llvm/test/CodeGen/X86/2007-09-27-LDIntrinsics.ll

@@ -8,9 +8,8 @@ entry:
 	ret x86_fp80 %tmp2
 
 ; CHECK-LABEL: foo:
-; CHECK: fldt 16(%esp)
+; CHECK: fldt 4(%esp)
 ; CHECK-NEXT: fsqrt
-; CHECK-NEXT: addl $12, %esp
 ; CHECK-NEXT: ret
 }
 
@@ -21,11 +20,10 @@ entry:
 	%tmp2 = call x86_fp80 @llvm.powi.f80.i32( x86_fp80 %x, i32 3 )
 	ret x86_fp80 %tmp2
 ; CHECK-LABEL: bar:
-; CHECK: fldt 16(%esp)
+; CHECK: fldt 4(%esp)
 ; CHECK-NEXT: fld	%st(0)
 ; CHECK-NEXT: fmul	%st(1)
 ; CHECK-NEXT: fmulp
-; CHECK-NEXT: addl $12, %esp
 ; CHECK-NEXT: ret
 }
 

llvm/test/CodeGen/X86/inline-asm-fpstack.ll

@@ -29,12 +29,10 @@ define double @test2() nounwind {
 define void @test3(x86_fp80 %X) nounwind {
 ; CHECK-LABEL: test3:
 ; CHECK:       ## %bb.0:
-; CHECK-NEXT:    subl $12, %esp
 ; CHECK-NEXT:    fldt {{[0-9]+}}(%esp)
 ; CHECK-NEXT:    ## InlineAsm Start
 ; CHECK-NEXT:    frob
 ; CHECK-NEXT:    ## InlineAsm End
-; CHECK-NEXT:    addl $12, %esp
 ; CHECK-NEXT:    retl
   call void asm sideeffect "frob ", "{st(0)},~{st},~{dirflag},~{fpsr},~{flags}"( x86_fp80 %X)
   ret void
@@ -248,14 +246,12 @@ entry:
 define void @fist1(x86_fp80 %x, ptr %p) nounwind ssp {
 ; CHECK-LABEL: fist1:
 ; CHECK:       ## %bb.0: ## %entry
-; CHECK-NEXT:    subl $12, %esp
 ; CHECK-NEXT:    fldt {{[0-9]+}}(%esp)
 ; CHECK-NEXT:    movl {{[0-9]+}}(%esp), %eax
 ; CHECK-NEXT:    ## InlineAsm Start
 ; CHECK-NEXT:    fistl (%eax)
 ; CHECK-NEXT:    ## InlineAsm End
 ; CHECK-NEXT:    fstp %st(0)
-; CHECK-NEXT:    addl $12, %esp
 ; CHECK-NEXT:    retl
 entry:
   tail call void asm sideeffect "fistl $1", "{st},*m,~{memory},~{dirflag},~{fpsr},~{flags}"(x86_fp80 %x, ptr elementtype(i32) %p) nounwind
@@ -273,13 +269,11 @@ entry:
 define x86_fp80 @fist2(x86_fp80 %x, ptr %p) nounwind ssp {
 ; CHECK-LABEL: fist2:
 ; CHECK:       ## %bb.0: ## %entry
-; CHECK-NEXT:    subl $12, %esp
 ; CHECK-NEXT:    fldt {{[0-9]+}}(%esp)
 ; CHECK-NEXT:    movl {{[0-9]+}}(%esp), %eax
 ; CHECK-NEXT:    ## InlineAsm Start
 ; CHECK-NEXT:    fistl (%eax)
 ; CHECK-NEXT:    ## InlineAsm End
-; CHECK-NEXT:    addl $12, %esp
 ; CHECK-NEXT:    retl
 entry:
   %0 = tail call x86_fp80 asm "fistl $2", "=&{st},0,*m,~{memory},~{dirflag},~{fpsr},~{flags}"(x86_fp80 %x, ptr elementtype(i32) %p) nounwind
@@ -294,15 +288,13 @@ entry:
 define void @fucomp1(x86_fp80 %x, x86_fp80 %y) nounwind ssp {
 ; CHECK-LABEL: fucomp1:
 ; CHECK:       ## %bb.0: ## %entry
-; CHECK-NEXT:    subl $12, %esp
 ; CHECK-NEXT:    fldt {{[0-9]+}}(%esp)
 ; CHECK-NEXT:    fldt {{[0-9]+}}(%esp)
 ; CHECK-NEXT:    fxch %st(1)
 ; CHECK-NEXT:    ## InlineAsm Start
 ; CHECK-NEXT:    fucomp %st(1)
 ; CHECK-NEXT:    ## InlineAsm End
 ; CHECK-NEXT:    fstp %st(0)
-; CHECK-NEXT:    addl $12, %esp
 ; CHECK-NEXT:    retl
 entry:
   tail call void asm sideeffect "fucomp $1", "{st},f,~{st},~{dirflag},~{fpsr},~{flags}"(x86_fp80 %x, x86_fp80 %y) nounwind
@@ -322,15 +314,13 @@ entry:
 define void @fucomp2(x86_fp80 %x, x86_fp80 %y) nounwind ssp {
 ; CHECK-LABEL: fucomp2:
 ; CHECK:       ## %bb.0: ## %entry
-; CHECK-NEXT:    subl $12, %esp
 ; CHECK-NEXT:    fldt {{[0-9]+}}(%esp)
 ; CHECK-NEXT:    fldt {{[0-9]+}}(%esp)
 ; CHECK-NEXT:    fxch %st(1)
 ; CHECK-NEXT:    ## InlineAsm Start
 ; CHECK-NEXT:    fucomp %st(1)
 ; CHECK-NEXT:    ## InlineAsm End
 ; CHECK-NEXT:    fstp %st(0)
-; CHECK-NEXT:    addl $12, %esp
 ; CHECK-NEXT:    retl
 entry:
   tail call void asm sideeffect "fucomp $1", "{st},{st(1)},~{st},~{dirflag},~{fpsr},~{flags}"(x86_fp80 %x, x86_fp80 %y) nounwind
@@ -340,14 +330,12 @@ entry:
 define void @fucomp3(x86_fp80 %x, x86_fp80 %y) nounwind ssp {
 ; CHECK-LABEL: fucomp3:
 ; CHECK:       ## %bb.0: ## %entry
-; CHECK-NEXT:    subl $12, %esp
 ; CHECK-NEXT:    fldt {{[0-9]+}}(%esp)
 ; CHECK-NEXT:    fldt {{[0-9]+}}(%esp)
 ; CHECK-NEXT:    fxch %st(1)
 ; CHECK-NEXT:    ## InlineAsm Start
 ; CHECK-NEXT:    fucompp %st(1)
 ; CHECK-NEXT:    ## InlineAsm End
-; CHECK-NEXT:    addl $12, %esp
 ; CHECK-NEXT:    retl
 entry:
   tail call void asm sideeffect "fucompp $1", "{st},{st(1)},~{st},~{st(1)},~{dirflag},~{fpsr},~{flags}"(x86_fp80 %x, x86_fp80 %y) nounwind