retitle 151196 [fixed in gcc-3.x] gcc-2.95.4-9 ICE in kernel (matroxfb) code
tags 151196 + fixed
thanks
Petr Vandrovec writes:
> Package: gcc-2.95
> Version: 2.95.4-9
>
> Hi,
> I removed debug prints from new matroxfb driver, and ... compiler
> died. Simplest example I was able to invent is below. If you uncomment
> printf(), or if you'll remove (almost) any line from computeRegs() body,
> it will stop ICE.
>
> gcc-3.0 (3.0.4-10) and gcc-3.1 (3.1.1-0pre2) compile code flawlessly.
>
> Best regards,
> Petr Vandrovec
> [EMAIL PROTECTED]
>
>
> $ gcc-2.95 -W -Wall -O2 bug.c
> bug.c: In function `computeRegs':
> bug.c:72: Internal compiler error:
> bug.c:72: internal error--unrecognizable insn:
> (insn 62 61 151 (parallel[
> (set (reg:SI 0 %eax)
> (asm_operands ("") ("=a") 0[
> (reg:DI 1 %edx)
> ]
> [
> (asm_input:DI ("A"))
> ] ("bug.c") 60))
> (set (reg:SI 1 %edx)
> (asm_operands ("") ("=d") 1[
> (reg:DI 1 %edx)
> ]
> [
> (asm_input:DI ("A"))
> ] ("bug.c") 60))
> ] ) -1 (insn_list 57 (nil))
> (nil))
> $
>
> #define do_div(n,base) ({ \
> unsigned long __upper, __low, __high, __mod; \
> asm("":"=a" (__low), "=d" (__high):"A" (n)); \
> __upper = __high; \
> if (__high) { \
> __upper = __high % (base); \
> __high = __high / (base); \
> } \
> asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (base), "0" (__low), "1"
> (__upper)); \
> asm("":"=A" (n):"a" (__low),"d" (__high)); \
> __mod; \
> })
>
> #define u_int32_t unsigned int
>
> struct mavenregs {
> unsigned char regs[256];
> };
>
> struct my_timming {
> u_int32_t HDisplay;
> unsigned int pixclock;
> unsigned int mnp;
> };
>
> struct output_desc {
> unsigned int h_vis;
> unsigned int h_f_porch;
> unsigned int h_sync;
> unsigned int h_b_porch;
> unsigned long long int chromasc;
> unsigned int burst;
> unsigned int v_total;
> };
>
> unsigned int matroxfb_g450_setclk(unsigned int, unsigned int);
> unsigned int g450_mnp2f(unsigned int);
>
> static void computeRegs(struct mavenregs* r, struct my_timming* mt, const
> struct output_desc* outd) {
> u_int32_t chromasc;
> u_int32_t hlen;
> u_int32_t hfp;
> u_int32_t hvis;
> unsigned int pixclock;
> unsigned long long piic;
> int mnp;
>
> hvis = 1;
> piic = 1000000000ULL * hvis;
>
> mnp = matroxfb_g450_setclk(piic, 3);
>
> mt->pixclock = g450_mnp2f(mnp);
> // printf("PX: %u\n", mt->pixclock);
> mt->mnp = mnp;
>
> pixclock = 1000000000U / mt->pixclock;
>
> piic = outd->chromasc;
> do_div(piic, mt->pixclock);
> chromasc = piic;
>
> r->regs[0] = chromasc >> 24;
> r->regs[1] = chromasc >> 16;
>
> hfp = (((outd->h_f_porch + pixclock) / pixclock)) & ~1;
> hlen = hvis + hfp;
>
> if (hlen) {
> hfp -= hlen;
> }
> }
>
>
>
>
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