77f005f954
Clang complains:
clang -O2 -m64 -mcx16 /home/alex/lsrc/qemu.git/tests/tcg/i386/test-i386-adcox.c -o test-i386-adcox -static
/home/alex/lsrc/qemu.git/tests/tcg/i386/test-i386-adcox.c:32:26: error: invalid input constraint '0' in asm
: "r" ((REG)-1), "0" (flags), "1" (out_adcx), "2" (out_adox));
^
/home/alex/lsrc/qemu.git/tests/tcg/i386/test-i386-adcox.c:57:26: error: invalid input constraint '0' in asm
: "r" ((REG)-1), "0" (flags), "1" (out_adcx), "2" (out_adox));
^
2 errors generated.
Pointing out a numbered input constraint can't point to a read/write
output [1]. Convert to a read-only input constraint to allow this.
[1] https://lists.llvm.org/pipermail/cfe-commits/Week-of-Mon-20101101/036036.html
Suggested-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20250304222439.2035603-16-alex.bennee@linaro.org>
76 lines
2.0 KiB
C
76 lines
2.0 KiB
C
/* See if various BMI2 instructions give expected results */
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#include <assert.h>
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#include <stdint.h>
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#include <stdio.h>
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#define CC_C 1
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#define CC_O (1 << 11)
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#ifdef __x86_64__
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#define REG uint64_t
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#else
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#define REG uint32_t
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#endif
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void test_adox_adcx(uint32_t in_c, uint32_t in_o, REG adcx_operand, REG adox_operand)
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{
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REG flags;
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REG out_adcx, out_adox;
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asm("pushf; pop %0" : "=r"(flags));
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flags &= ~(CC_C | CC_O);
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flags |= (in_c ? CC_C : 0);
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flags |= (in_o ? CC_O : 0);
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out_adcx = adcx_operand;
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out_adox = adox_operand;
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asm("push %0; popf;"
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"adox %3, %2;"
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"adcx %3, %1;"
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"pushf; pop %0"
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: "+r" (flags), "+r" (out_adcx), "+r" (out_adox)
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: "r" ((REG) - 1), "0" (flags), "1" (out_adcx), "2" (out_adox));
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assert(out_adcx == in_c + adcx_operand - 1);
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assert(out_adox == in_o + adox_operand - 1);
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assert(!!(flags & CC_C) == (in_c || adcx_operand));
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assert(!!(flags & CC_O) == (in_o || adox_operand));
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}
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void test_adcx_adox(uint32_t in_c, uint32_t in_o, REG adcx_operand, REG adox_operand)
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{
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REG flags;
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REG out_adcx, out_adox;
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asm("pushf; pop %0" : "=r"(flags));
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flags &= ~(CC_C | CC_O);
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flags |= (in_c ? CC_C : 0);
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flags |= (in_o ? CC_O : 0);
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out_adcx = adcx_operand;
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out_adox = adox_operand;
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asm("push %0; popf;"
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"adcx %3, %1;"
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"adox %3, %2;"
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"pushf; pop %0"
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: "+r"(flags), "+r"(out_adcx), "+r"(out_adox)
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: "r" ((REG)-1));
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assert(out_adcx == in_c + adcx_operand - 1);
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assert(out_adox == in_o + adox_operand - 1);
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assert(!!(flags & CC_C) == (in_c || adcx_operand));
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assert(!!(flags & CC_O) == (in_o || adox_operand));
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}
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int main(int argc, char *argv[]) {
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/* try all combinations of input CF, input OF, CF from op1+op2, OF from op2+op1 */
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int i;
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for (i = 0; i <= 15; i++) {
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printf("%d\n", i);
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test_adcx_adox(!!(i & 1), !!(i & 2), !!(i & 4), !!(i & 8));
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test_adox_adcx(!!(i & 1), !!(i & 2), !!(i & 4), !!(i & 8));
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}
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return 0;
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}
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