math/mpx-mul4-x86-sse2.S: Maintain a local copy of the counter.

I've no idea whether one's allowed to mutate a parameter passed on the
stack.  Play it safe.

This means that (a) the counter is now in a fixed place in the frame so
that `testtail' doesn't need to be told where it is, an (b)
`testprologue' needs to initialize it from the caller's parameter, so it
needs to grow a macro argument.

diff --git a/math/mpx-mul4-x86-sse2.S b/math/mpx-mul4-x86-sse2.S
index 14052fd02f9ea62f211187523aa94d514e8b53fa..f6c81673ebde740740941e43d03a8eebcda873c6 100644 (file)
--- a/math/mpx-mul4-x86-sse2.S
+++ b/math/mpx-mul4-x86-sse2.S
@@ -1068,7 +1068,7 @@ ENDFUNC
        mov     [ebx + ecx*8 + 4], edx
 .endm
 
-.macro testprologue
+.macro testprologue n
        pushreg ebp
        pushreg ebx
        pushreg esi
@@ -1077,11 +1077,14 @@ ENDFUNC
        and     esp, ~15
        sub     esp, 3*32 + 4*4
   endprologue
+       mov     eax, \n
+       mov     [esp + 104], eax
        // vars:
        //      esp +   0 = v expanded
        //      esp +  32 = y expanded
        //      esp +  64 = ? expanded
        //      esp +  96 = cycles
+       //      esp + 104 = count
 .endm
 
 .macro testepilogue
@@ -1139,8 +1142,8 @@ ENDFUNC
   .endif
 .endm
 
-.macro testtail cyv, n
-       cystore esp + 96, \cyv, \n
+.macro testtail cyv
+       cystore esp + 96, \cyv, esp + 104
        jnz     0b
 .endm
 
@@ -1152,60 +1155,60 @@ ENDFUNC
 .endm
 
 FUNC(test_dmul4)
-       testprologue
+       testprologue [ebp + 44]
        testldcarry [ebp + 24]
        testexpand [ebp + 36], [ebp + 40]
        mov     edi, [ebp + 20]
        testtop [ebp + 28], [ebp + 32]
        call    dmul4
-       testtail [ebp + 48], [ebp + 44]
+       testtail [ebp + 48]
        testcarryout [ebp + 24]
        testepilogue
 ENDFUNC
 
 FUNC(test_dmla4)
-       testprologue
+       testprologue [ebp + 44]
        testldcarry [ebp + 24]
        testexpand [ebp + 36], [ebp + 40]
        mov     edi, [ebp + 20]
        testtop [ebp + 28], [ebp + 32]
        call    dmla4
-       testtail [ebp + 48], [ebp + 44]
+       testtail [ebp + 48]
        testcarryout [ebp + 24]
        testepilogue
 ENDFUNC
 
 FUNC(test_mul4)
-       testprologue
+       testprologue [ebp + 36]
        testldcarry [ebp + 24]
        testexpand nil, [ebp + 32]
        mov     edi, [ebp + 20]
        testtop nil, [ebp + 28]
        call    mul4
-       testtail [ebp + 40], [ebp + 36]
+       testtail [ebp + 40]
        testcarryout [ebp + 24]
        testepilogue
 ENDFUNC
 
 FUNC(test_mla4)
-       testprologue
+       testprologue [ebp + 36]
        testldcarry [ebp + 24]
        testexpand nil, [ebp + 32]
        mov     edi, [ebp + 20]
        testtop nil, [ebp + 28]
        call    mla4
-       testtail [ebp + 40], [ebp + 36]
+       testtail [ebp + 40]
        testcarryout [ebp + 24]
        testepilogue
 ENDFUNC
 
 FUNC(test_mmul4)
-       testprologue
+       testprologue [ebp + 48]
        testexpand [ebp + 40], [ebp + 44]
        mov     edi, [ebp + 20]
        testtop [ebp + 32], [ebp + 36], mont
        call    mmul4
-       testtail [ebp + 52], [ebp + 48]
+       testtail [ebp + 52]
        mov     edi, [ebp + 28]
        movdqa  xmm0, [esp + 64]
        movdqa  xmm1, [esp + 80]
@@ -1216,12 +1219,12 @@ FUNC(test_mmul4)
 ENDFUNC
 
 FUNC(test_mmla4)
-       testprologue
+       testprologue [ebp + 48]
        testexpand [ebp + 40], [ebp + 44]
        mov     edi, [ebp + 20]
        testtop [ebp + 32], [ebp + 36], mont
        call    mmla4
-       testtail [ebp + 52], [ebp + 48]
+       testtail [ebp + 52]
        mov     edi, [ebp + 28]
        movdqa  xmm0, [esp + 64]
        movdqa  xmm1, [esp + 80]
@@ -1232,12 +1235,12 @@ FUNC(test_mmla4)
 ENDFUNC
 
 FUNC(test_mont4)
-       testprologue
+       testprologue [ebp + 40]
        testexpand nil, [ebp + 36]
        mov     edi, [ebp + 20]
        testtop nil, [ebp + 32], mont
        call    mont4
-       testtail [ebp + 44], [ebp + 40]
+       testtail [ebp + 44]
        mov     edi, [ebp + 28]
        movdqa  xmm0, [esp + 64]
        movdqa  xmm1, [esp + 80]