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Manualy reduced testcase
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| extern void externCall(float); | |
| extern float sinrotation(); | |
| extern float cosrotation(); | |
| static const float midX = 850.5f; | |
| static const float midY = 1753.5f; | |
| void main() { | |
| const float srcX = midX * cosrotation() - midY * sinrotation(); | |
| externCall(srcX); | |
| } |
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| --- deskew-bdver1-noavx.S 2014-10-27 10:03:19.396965654 -0700 | |
| +++ deskew-bdver1.S 2014-10-27 10:03:19.372966911 -0700 | |
| @@ -25,13 +25,12 @@ | |
| movq -8(%rbp), %rax | |
| xorq %fs:40, %rax | |
| jne .L6 | |
| - vmovss -20(%rbp), %xmm2 | |
| - vmulss .LC1(%rip), %xmm0, %xmm0 | |
| - vmulss .LC0(%rip), %xmm2, %xmm1 | |
| + vmulss .LC1(%rip), %xmm0, %xmm0 | |
| + vmovss -20(%rbp), %xmm1 | |
| + vfmsubss %xmm0, .LC0(%rip), %xmm1, %xmm0 | |
| leave | |
| .cfi_remember_state | |
| .cfi_def_cfa 7, 8 | |
| - vsubss %xmm0, %xmm1, %xmm0 | |
| jmp externCall@PLT | |
| .L6: | |
| .cfi_restore_state |
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Note that if I change the rotation value, the problem can go away.. 0.05f works with both settings the same, 0.06f triggers the bug too.