liblzma: fix movzw compatibility in range_decoder.h, close tukaani-pr…

…oject#121.

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'

This has been reported by at least 3 different users. Since xz
and liblzma are base system tools and are often required in system
upgrades themselves, compatibility with old systems shall be kept.
This commit changes "movzw" to "movzwl" for compatibility.

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

Suggested-By: Lasse Collin <[email protected]>
Tested-By: Yifeng Li <[email protected]>
Signed-off-by: Yifeng Li <[email protected]>

src/liblzma/rangecoder/range_decoder.h

@@ -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" \
 		\