Output of the test in tests/check/orc of the float processing function is this btw (with latest GIT as of now):

[...]
orc_scalarmultiply_f32_ns:
dest array 0 bad
 0  0: f24b1d2f -> f2cb1d2f 00000000 *
 1  0: aa6a9c6a -> aaea9c6a 00000000 *
 2  0: b2039ebf -> b2839ebf 00000000 *
 3  0: 7c7333fc -> 7cf333fc 00000000 *
 4  0: 3f227a35 -> 3fa27a35 00000000 *
 5  0: b7b70306 -> b8370306 00000000 *
 6  0: 9ffde6a8 -> a07de6a8 00000000 *
 7  0: ef93a0b6 -> f013a0b6 00000000 *
 8  0: d556b0bd -> d5d6b0bd 00000000 *
 9  0: 758ff686 -> 760ff686 00000000 *
10  0: 61ddc622 -> 625dc622 00000000 *
11  0: d7e1cfba -> d861cfba 00000000 *
12  0: bdabaf13 -> be2baf13 00000000 *
13  0: 5de752e4 -> 5e6752e4 00000000 *
14  0: e0c70ed8 -> e1470ed8 00000000 *
15  0: 8cb07f61 -> 8d307f61 00000000 *
16  0: bda42443 -> be242443 00000000 *
17  0: a572b6db -> a5f2b6db 00000000 *
18  0: c39f4c33 -> c41f4c33 00000000 *
19  0: 241330c8 -> 249330c8 00000000 *
20  0: 5d837e15 -> 5e037e15 00000000 *
21  0: 43a282e7 -> 442282e7 00000000 *
22  0: 7107cf60 -> 7187cf60 00000000 *
23  0: 77dc1fc8 -> 785c1fc8 00000000 *
24  0: e24cee17 -> e2ccee17 00000000 *
25  0: f0aad543 -> f12ad543 00000000 *
26  0: 1062a74a -> 10e2a74a 00000000 *
27  0: 1ba04dfe -> 1c204dfe 00000000 *
28  0: 55c26293 -> 56426293 00000000 *
29  0: 227e8de9 -> 22fe8de9 00000000 *
30  0: 88d3a29a -> 8953a29a 00000000 *
31  0: 68b178c3 -> 693178c3 00000000 *
32  0: 7c678893 -> 7ce78893 00000000 *
33  0: 0fd14a95 -> 10514a95 00000000 *
34  0: 803d4fbd -> 80000000 00000000 *
35  0: 74221f34 -> 74a21f34 00000000 *
36  0: de7fd0e3 -> deffd0e3 00000000 *
37  0: b0146bc1 -> b0946bc1 00000000 *
38  0: 5e44fedd -> 5ec4fedd 00000000 *
39  0: 17c5812b -> 1845812b 00000000 *
40  0: c30d690e -> c38d690e 00000000 *
41  0: bb7c0ea9 -> bbfc0ea9 00000000 *
42  0: 4a4abde6 -> 4acabde6 00000000 *
43  0: e72f9d42 -> e7af9d42 00000000 *
44  0: 30d4425f -> 3154425f 00000000 *
45  0: a6fc1347 -> a77c1347 00000000 *
46  0: 2b715c81 -> 2bf15c81 00000000 *
47  0: 3cb132d6 -> 3d3132d6 00000000 *
48  0: ee560ae0 -> eed60ae0 00000000 *
49  0: aa461857 -> aac61857 00000000 *
50  0: a89e691b -> a91e691b 00000000 *
51  0: 2c5fbf01 -> 2cdfbf01 00000000 *
52  0: 83d6305e -> 8456305e 00000000 *
53  0: bdcd7d54 -> be4d7d54 00000000 *
54  0: 277433df -> 27f433df 00000000 *
55  0: 8f0c849e -> 8f8c849e 00000000 *
56  0: 3759e362 -> 37d9e362 00000000 *
57  0: 95c56178 -> 96456178 00000000 *
58  0: d154cab6 -> d1d4cab6 00000000 *
59  0: fb4c7e48 -> fbcc7e48 00000000 *
60  0: 0fa01138 -> 10201138 00000000 *
61  0: ab20a2be -> aba0a2be 00000000 *
62  0: 8a63fc4d -> 8ae3fc4d 00000000 *
63  0: c8706e5a -> c8f06e5a 00000000 *
64  0: d42f6aea -> d4af6aea 00000000 *
.global orc_scalarmultiply_f32_ns
.p2align 4
orc_scalarmultiply_f32_ns:
  rdtsc
  movl %eax, 592(%rdi)
  stmxcsr 596(%rdi)
  movl 596(%rdi), %ecx
  movl %ecx, 600(%rdi)
  orl $32832, %ecx
  movl %ecx, 596(%rdi)
  ldmxcsr 596(%rdi)
# 1: loadpl
  movd 632(%rdi), %xmm0
  pshufd $0x0000, %xmm0, %xmm0
  movl $16, %eax
  subl 24(%rdi), %eax
  andl $15, %eax
  sarl $2, %eax
  cmpl %eax, 8(%rdi)
  jle 6f
  movl %eax, 12(%rdi)
  movl 8(%rdi), %ecx
  subl %eax, %ecx
  movl %ecx, %eax
  sarl $3, %ecx
  movl %ecx, 16(%rdi)
  andl $7, %eax
  movl %eax, 20(%rdi)
  jmp 7f
6:
  movl 8(%rdi), %eax
  movl %eax, 12(%rdi)
  movl $0, %eax
  movl %eax, 16(%rdi)
  movl %eax, 20(%rdi)
7:
  mov 24(%rdi), %rax
  mov 56(%rdi), %rdx
# LOOP SHIFT 0
  testl $1, 12(%rdi)
  je 13f
# 0: loadl
  movd 0(%rdx), %xmm1
# 2: mulf
  mulps %xmm0, %xmm1
# 3: storel
  movd %xmm1, 0(%rax)
  lea 4(%rax), %rax
  lea 4(%rdx), %rdx
13:
# LOOP SHIFT 1
  testl $2, 12(%rdi)
  je 14f
# 0: loadl
  movq 0(%rdx), %xmm1
# 2: mulf
  mulps %xmm0, %xmm1
# 3: storel
  movq %xmm1, 0(%rax)
  lea 8(%rax), %rax
  lea 8(%rdx), %rdx
14:
1:
  cmpl $0, 16(%rdi)
  je 3f
  movl 16(%rdi), %esi
# LOOP SHIFT 2
  nop
  nop
  nop
  nop
  nop
  nop
  nop
  nop
  nop
  nop
  nop
  nop
  nop
2:
# 0: loadl
  movdqu 0(%rdx), %xmm1
# 2: mulf
  mulps %xmm0, %xmm1
# 3: storel
  movdqa %xmm1, 0(%rax)
# 0: loadl
  movdqu 16(%rdx), %xmm1
# 2: mulf
  mulps %xmm0, %xmm1
# 3: storel
  movdqa %xmm1, 16(%rax)
  lea 32(%rax), %rax
  lea 32(%rdx), %rdx
  addl $-1, %esi
  jne 2b
3:
# LOOP SHIFT 2
  testl $4, 20(%rdi)
  je 10f
# 0: loadl
  movdqu 0(%rdx), %xmm1
# 2: mulf
  mulps %xmm0, %xmm1
# 3: storel
  movdqu %xmm1, 0(%rax)
  lea 16(%rax), %rax
  lea 16(%rdx), %rdx
10:
# LOOP SHIFT 1
  testl $2, 20(%rdi)
  je 9f
# 0: loadl
  movq 0(%rdx), %xmm1
# 2: mulf
  mulps %xmm0, %xmm1
# 3: storel
  movq %xmm1, 0(%rax)
  lea 8(%rax), %rax
  lea 8(%rdx), %rdx
9:
# LOOP SHIFT 0
  testl $1, 20(%rdi)
  je 8f
# 0: loadl
  movd 0(%rdx), %xmm1
# 2: mulf
  mulps %xmm0, %xmm1
# 3: storel
  movd %xmm1, 0(%rax)
  lea 4(%rax), %rax
  lea 4(%rdx), %rdx
8:
  ldmxcsr 600(%rdi)
  rdtsc
  movl %eax, 596(%rdi)
  retq
[...]

I'll readd the conditional build stuff :/

With orc git it looks like this:

orc_scalarmultiply_f32_ns:
    backup function  :   PASSED
dest array 0 bad
 0  0: 657a54ef -> 00000000 00000000
 1  0: 3e4aecea -> 00000000 00000000
 2  0: cb0e741d -> 00000000 80000000 *
 3  0: 1ca2e423 -> 00000000 00000000
 4  0: 896a0169 -> 00000000 80000000 *
 5  0: c70e8e8a -> 00000000 80000000 *
 6  0: acf53268 -> 00000000 80000000 *
 7  0: c282280e -> 00000000 80000000 *
 8  0: 8d11a848 -> 00000000 80000000 *
 9  0: 9cb01900 -> 00000000 80000000 *
10  0: 529df357 -> 00000000 00000000
11  0: 72847687 -> 00000000 00000000
12  0: 6c750c7b -> 00000000 00000000
13  0: 69a77f2b -> 00000000 00000000
14  0: 18efdbb9 -> 00000000 00000000
15  0: 36fe214d -> 00000000 00000000
16  0: e05db0b1 -> 00000000 80000000 *
17  0: 982a73ab -> 00000000 80000000 *
18  0: 1990cb1e -> 00000000 00000000
19  0: da073bdf -> 00000000 80000000 *
20  0: 6451d658 -> 00000000 00000000
21  0: 543069df -> 00000000 00000000
22  0: 2fe768d4 -> 00000000 00000000
23  0: ea77997d -> 00000000 80000000 *
24  0: 349682a1 -> 00000000 00000000
25  0: 896f94e6 -> 00000000 80000000 *
26  0: f71d14ea -> 00000000 80000000 *
27  0: afe5cd24 -> 00000000 80000000 *
28  0: 4b357779 -> 00000000 00000000
29  0: e160e59e -> 00000000 80000000 *
30  0: cb17f230 -> 00000000 80000000 *
31  0: 34a72a94 -> 00000000 00000000
32  0: 63f53790 -> 00000000 00000000
33  0: c73912a6 -> 00000000 80000000 *
34  0: c77de534 -> 00000000 80000000 *
35  0: 46d4c24d -> 00000000 00000000
36  0: f85b0655 -> 00000000 80000000 *
37  0: 67f18b5f -> 00000000 00000000
38  0: c4b69146 -> 00000000 80000000 *
39  0: 6e446a8d -> 00000000 00000000
40  0: 44b0e7f7 -> 00000000 00000000
41  0: ab3f85e5 -> 00000000 80000000 *
42  0: 5ee85774 -> 00000000 00000000
43  0: f88eb353 -> 00000000 80000000 *
44  0: 43fa9c65 -> 00000000 00000000
45  0: 3e9af31a -> 00000000 00000000
46  0: f0fb5c8d -> 00000000 80000000 *
47  0: ef08f15d -> 00000000 80000000 *
48  0: af00a94d -> 00000000 80000000 *
49  0: 8c38879b -> 00000000 80000000 *
50  0: 95968221 -> 00000000 80000000 *
51  0: 1ec9372c -> 00000000 00000000
52  0: 0449511f -> 00000000 00000000
53  0: be12b4c8 -> 00000000 80000000 *
54  0: 29206c7e -> 00000000 00000000
55  0: 10a959ff -> 00000000 00000000
56  0: 7c1d960b -> 00000000 00000000
57  0: c1deaebf -> 00000000 80000000 *
58  0: 45bf7eb3 -> 00000000 00000000
59  0: 0f3ee8d3 -> 00000000 00000000
60  0: 13813cfe -> 00000000 00000000
61  0: 40136760 -> 00000000 00000000
62  0: 455bd98f -> 00000000 00000000
63  0: 27e03868 -> 00000000 00000000
64  0: 843fc6a8 -> 00000000 80000000 *
65  0: a4e79249 -> 00000000 80000000 *
66  0: 459b62a3 -> 00000000 00000000
67  0: 23a55c3e -> 00000000 00000000
68  0: 49db7678 -> 00000000 00000000
69  0: 1a53a3db -> 00000000 00000000

I have pushed this commit to at least have a working volume element. If it turn our hard to get fixed I disable the orc code.

commit e4d33ef53baa5ae1d28743992e7f97635ac5411f
Author: Stefan Kost <ensonic@users.sf.net>
Date:   Thu Aug 26 15:17:20 2010 +0300

    volume: make the orc usage for float conditional again

Found it.

commit 21cc9b3a1c36619644d640f94f375f25a6c715ac
Author: David Schleef <ds@schleef.org>
Date:   Thu Aug 26 17:58:42 2010 -0700

    c: Fix loading of float params
    
    Float params are loaded from orc_union32 pointers into orc_union32
    temporaries, so it's important to not to a float->int conversion
    in there.