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target/i386: Fix carry flag for BLSI

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BLSI has inverted semantics for C as compared to the other two
BMI1 instructions, BLSMSK and BLSR.  Introduce CC_OP_BLSI* for
this purpose.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2175
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20240801075845.573075-3-richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2024-08-01 17:57:45 +10:00
parent 266d6dddbd
commit 83a3a20e59
7 changed files with 72 additions and 1 deletions
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1
tests/tcg/x86_64/Makefile.target
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@ -16,6 +16,7 @@ X86_64_TESTS += noexec
X86_64_TESTS += cmpxchg
X86_64_TESTS += adox
X86_64_TESTS += test-1648
X86_64_TESTS += test-2175
TESTS=$(MULTIARCH_TESTS) $(X86_64_TESTS) test-x86_64
else
TESTS=$(MULTIARCH_TESTS)

24
tests/tcg/x86_64/test-2175.c Normal file
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@ -0,0 +1,24 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
/* See https://gitlab.com/qemu-project/qemu/-/issues/2185 */
#include <assert.h>
int test_setc(unsigned int x, unsigned int y)
{
asm("blsi %1, %0; setc %b0" : "+r"(x) : "r"(y));
return (unsigned char)x;
}
int test_pushf(unsigned int x, unsigned int y)
{
asm("blsi %1, %0; pushf; pop %q0" : "+r"(x) : "r"(y));
return x & 1;
}
int main()
{
assert(test_setc(1, 0xedbf530a));
assert(test_pushf(1, 0xedbf530a));
return 0;
}