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liblzma: Fix x86-64 movzw compatibility in range_decoder.h 

Support for instruction "movzw" without suffix in "GNU as" was
added in commit [1] and stabilized in binutils 2.27, released
in August 2016. Earlier systems don't accept this instruction
without a suffix, making range_decoder.h's inline assembly
unable to build on old systems such as Ubuntu 16.04, creating
error messages like:

    lzma_decoder.c: Assembler messages:
    lzma_decoder.c:371: Error: no such instruction: `movzw 2(%r11),%esi'
    lzma_decoder.c:373: Error: no such instruction: `movzw 4(%r11),%edi'
    lzma_decoder.c:388: Error: no such instruction: `movzw 6(%r11),%edx'
    lzma_decoder.c:398: Error: no such instruction: `movzw (%r11,%r14,4),%esi'

Change "movzw" to "movzwl" for compatibility.

[1] https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=c07315e0c610e0e3317b4c02266f81793df253d2

Suggested-by: Lasse Collin <lasse.collin@tukaani.org>
Tested-by: Yifeng Li <tomli@tomli.me>
Signed-off-by: Yifeng Li <tomli@tomli.me>
Fixes: 3182a330c1
Fixes: https://github.com/tukaani-project/xz/issues/121
Closes: https://github.com/tukaani-project/xz/pull/136
This commit is contained in:
Yifeng Li 2024-08-22 02:18:49 +00:00 committed by Lasse Collin
parent bf901dee5d
commit 6cd7c86078
1 changed files with 12 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
src/liblzma/rangecoder/range_decoder.h
View File

@ -592,13 +592,13 @@ do { \
// *_only = rc_asm_y or _n to include or exclude code marked with them
#define rc_asm_bittree(a, b, first_only, middle_only, last_only) \
first_only( \
"movzw 2(%[probs_base]), %[prob" #a "]\n\t" \
"movzwl 2(%[probs_base]), %[prob" #a "]\n\t" \
"mov $2, %[symbol]\n\t" \
"movzw 4(%[probs_base]), %[prob" #b "]\n\t" \
"movzwl 4(%[probs_base]), %[prob" #b "]\n\t" \
) \
middle_only( \
/* Note the scaling of 4 instead of 2: */ \
"movzw (%[probs_base], %q[symbol], 4), %[prob" #b "]\n\t" \
"movzwl (%[probs_base], %q[symbol], 4), %[prob" #b "]\n\t" \
) \
last_only( \
"add %[symbol], %[symbol]\n\t" \
@ -610,11 +610,11 @@ do { \
"cmovae %[t0], %[range]\n\t" \
\
first_only( \
"movzw 6(%[probs_base]), %[t0]\n\t" \
"movzwl 6(%[probs_base]), %[t0]\n\t" \
"cmovae %[t0], %[prob" #b "]\n\t" \
) \
middle_only( \
"movzw 2(%[probs_base], %q[symbol], 4), %[t0]\n\t" \
"movzwl 2(%[probs_base], %q[symbol], 4), %[t0]\n\t" \
"lea (%q[symbol], %q[symbol]), %[symbol]\n\t" \
"cmovae %[t0], %[prob" #b "]\n\t" \
) \
@ -716,12 +716,12 @@ do { \
#define rc_asm_bittree_rev(a, b, add, dcur, dnext0, dnext1, \
first_only, middle_only, last_only) \
first_only( \
"movzw 2(%[probs_base]), %[prob" #a "]\n\t" \
"movzwl 2(%[probs_base]), %[prob" #a "]\n\t" \
"xor %[symbol], %[symbol]\n\t" \
"movzw 4(%[probs_base]), %[prob" #b "]\n\t" \
"movzwl 4(%[probs_base]), %[prob" #b "]\n\t" \
) \
middle_only( \
"movzw " #dnext0 "(%[probs_base], %q[symbol], 2), " \
"movzwl " #dnext0 "(%[probs_base], %q[symbol], 2), " \
"%[prob" #b "]\n\t" \
) \
\
@ -731,11 +731,11 @@ do { \
"cmovae %[t0], %[range]\n\t" \
\
first_only( \
"movzw 6(%[probs_base]), %[t0]\n\t" \
"movzwl 6(%[probs_base]), %[t0]\n\t" \
"cmovae %[t0], %[prob" #b "]\n\t" \
) \
middle_only( \
"movzw " #dnext1 "(%[probs_base], %q[symbol], 2), %[t0]\n\t" \
"movzwl " #dnext1 "(%[probs_base], %q[symbol], 2), %[t0]\n\t" \
"cmovae %[t0], %[prob" #b "]\n\t" \
) \
\
@ -788,7 +788,7 @@ do { \
uint32_t t_index; \
\
__asm__( \
"movzw (%[probs_base], %q[symbol], 2), %[prob]\n\t" \
"movzwl (%[probs_base], %q[symbol], 2), %[prob]\n\t" \
"mov %[symbol], %[index]\n\t" \
\
"add %[dest], %[t2]\n\t" \
@ -844,7 +844,7 @@ do { \
"and %[offset], %[match_bit]\n\t" \
"add %[match_bit], %[symbol]\n\t" \
\
"movzw (%[probs_base], %q[symbol], 2), %[prob]\n\t" \
"movzwl (%[probs_base], %q[symbol], 2), %[prob]\n\t" \
\
"add %[symbol], %[symbol]\n\t" \
\