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Fix pointer difference issue in aarch64/riscv64
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Browse Source 
When calculating the difference between two pointers (TOK_PDIV), the
AArch64 and RISC-V64 backends used unsigned division
instructions (udiv/divu).

This patch moves TOK_PDIV to use signed division instructions (sdiv/div)
for both backends, ensuring correct behavior as per the C standard.
This commit is contained in:
Dylan Fei 2025-12-23 15:54:35 +08:00
parent 5a370d8a6b
commit 11118be717
2 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arm64-gen.c
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@ -1756,6 +1756,7 @@ static void arm64_gen_opil(int op, uint32_t l)
o(0x4b000000 | l << 31 | x | a << 5 | b << 16); // sub
break;
case '/':
case TOK_PDIV:
o(0x1ac00c00 | l << 31 | x | a << 5 | b << 16); // sdiv
break;
case '^':
@ -1798,7 +1799,6 @@ static void arm64_gen_opil(int op, uint32_t l)
o(0x1ac02400 | l << 31 | x | a << 5 | b << 16); // lsr
break;
case TOK_UDIV:
case TOK_PDIV:
o(0x1ac00800 | l << 31 | x | a << 5 | b << 16); // udiv
break;
case TOK_UGE:

2
riscv64-gen.c
View File

@ -1110,6 +1110,7 @@ static void gen_opil(int op, int ll)
ER(0x33 | ll, 0, d, a, b, 1); // mul d, a, b
break;
case '/':
case TOK_PDIV:
ER(0x33 | ll, 4, d, a, b, 1); // div d, a, b
break;
case '&':
@ -1127,7 +1128,6 @@ static void gen_opil(int op, int ll)
case TOK_UMOD:
ER(0x33 | ll, 7, d, a, b, 1); // remu d, a, b
break;
case TOK_PDIV:
case TOK_UDIV:
ER(0x33 | ll, 5, d, a, b, 1); // divu d, a, b
break;