https://bugs.kde.org/show_bug.cgi?id=468575
--- Comment #75 from Mark Wielaard <m...@klomp.org> ---
Trying to figure out:
integer.c: Assembler messages:
integer.c:132: Error: illegal operands `la zero,0'
integer.c:132 is:
TESTINST_0_2_Bxx_COND(4, "beq a0, zero, 1f", 0, 0, a0, zero);
TESTINST_0_2_Bxx_COND defined in testinst.h:
#define TESTINST_0_2_Bxx_COND(length, instruction, rs1_val, rs2_val, rs1, rs2)
\
JMP_COND(length, instruction, #rs1_val, #rs2_val, rs1, rs2)
#define JMP_COND(length, instruction, rs1_val, rs2_val, rs1, rs2)
\
{
\
unsigned long w[3 /*out*/ + 2 /*spill*/] = {0, 0, 0, 0, 0};
\
/* w[0] = flag that the branch was taken
\
w[1] = flag that rs1 is valid
\
w[2] = flag that rs2 is valid
\
w[3] = spill slot for rs1
\
w[4] = spill slot for rs2
\
*/
\
register unsigned long* t1 asm("t1") = w;
\
__asm__ __volatile__(
\
"li t2, 1;"
\
"sd t2, 0(%[w]);" /* Set result to "taken". */
\
".if \"" #rs1 "\" != \"unused\";"
\
"sd " #rs1 ", 24(%[w]);" /* Spill rs1. */
\
"la " #rs1 ", " rs1_val ";" /* Load the first input. */
\
".endif;"
\
".if \"" #rs2 "\" != \"unused\";"
\
"sd " #rs2 ", 32(%[w]);" /* Spill rs2. */
\
"la " #rs2 ", " rs2_val ";" /* Load the second input. */
\
".endif;"
\
ASMINST_##length(instruction) ";"
\
"li t2, 0;"
\
"sd t2, 0(%[w]);" /* Set result to "not taken". */
\
"1:;"
\
".if \"" #rs1 "\" != \"unused\";"
\
"li t2, 1;"
\
"sd t2, 8(%[w]);" /* Flag that rs1 is valid. */
\
".endif;"
\
".if \"" #rs2 "\" != \"unused\";"
\
"li t2, 1;"
\
"sd t2, 16(%[w]);" /* Flag that rs2 is valid. */
\
".endif;"
\
".if \"" #rs1 "\" != \"unused\";"
\
"ld " #rs1 ", 24(%[w]);" /* Reload rs1. */
\
".endif;"
\
".if \"" #rs2 "\" != \"unused\";"
\
"ld " #rs2 ", 32(%[w]);" /* Reload rs2. */
\
".endif;"
\
:
\
: [w] "r"(t1)
\
: "t2", "memory");
\
printf("%s ::\n", instruction);
\
if (w[1] != 0) { /* If rs1 is valid. */
\
printf(" inputs: %s=%s", #rs1, rs1_val);
\
if (w[2] != 0) /* If rs2 is valid. */
\
printf(", %s=%s", #rs2, rs2_val);
\
printf("\n");
\
}
\
printf(" branch: %s\n", w[0] ? "taken" : "not taken");
\
}
So it looks like this line:
"la " #rs2 ", " rs2_val ";" /* Load the second input. */
\
rs2 = zero and rs2_val = 0
Producing
"la zero, 0;"
So that is a write to the zero register of 0.
Which should be legal? The zero register should ignore writes?
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