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| author | Michael Matz <matz@suse.de> | 2016-06-30 15:47:58 +0200 |
|---|---|---|
| committer | Michael Matz <matz@suse.de> | 2016-12-15 17:47:07 +0100 |
| commit | 1a5eacb445a0116722e88e1a8a3e88e9d4127d2b (patch) | |
| tree | 6330bf403930d823891a10d45020476ad583b085 | |
| parent | ff5561ff7d699eb9e30e95f1e2cfd1e98e5a990d (diff) | |
| download | tinycc-1a5eacb445a0116722e88e1a8a3e88e9d4127d2b.tar.gz tinycc-1a5eacb445a0116722e88e1a8a3e88e9d4127d2b.tar.bz2 | |
tccasm: Implement compare expressions
I.e. implement < > <= >= == !=. Comparisons are signed and result
is -1 if true, 0 if false.
| -rw-r--r-- | tccasm.c | 46 | ||||
| -rw-r--r-- | tests/asmtest.S | 6 |
2 files changed, 51 insertions, 1 deletions
@@ -259,9 +259,51 @@ static inline void asm_expr_sum(TCCState *s1, ExprValue *pe) } } -ST_FUNC void asm_expr(TCCState *s1, ExprValue *pe) +static inline void asm_expr_cmp(TCCState *s1, ExprValue *pe) { + int op; + ExprValue e2; + asm_expr_sum(s1, pe); + for(;;) { + op = tok; + if (op != TOK_EQ && op != TOK_NE + && (op > TOK_GT || op < TOK_ULE)) + break; + next(); + asm_expr_sum(s1, &e2); + if (pe->sym || e2.sym) + tcc_error("invalid operation with label"); + switch(op) { + case TOK_EQ: + pe->v = pe->v == e2.v; + break; + case TOK_NE: + pe->v = pe->v != e2.v; + break; + case TOK_LT: + pe->v = (int64_t)pe->v < (int64_t)e2.v; + break; + case TOK_GE: + pe->v = (int64_t)pe->v >= (int64_t)e2.v; + break; + case TOK_LE: + pe->v = (int64_t)pe->v <= (int64_t)e2.v; + break; + case TOK_GT: + pe->v = (int64_t)pe->v > (int64_t)e2.v; + break; + default: + break; + } + /* GAS compare results are -1/0 not 1/0. */ + pe->v = -(int64_t)pe->v; + } +} + +ST_FUNC void asm_expr(TCCState *s1, ExprValue *pe) +{ + asm_expr_cmp(s1, pe); } ST_FUNC int asm_int_expr(TCCState *s1) @@ -391,6 +433,8 @@ static void asm_parse_directive(TCCState *s1) if (sec->sh_addralign < n) sec->sh_addralign = n; } else { + if (n < 0) + n = 0; size = n; } v = 0; diff --git a/tests/asmtest.S b/tests/asmtest.S index 652e50b..79419b9 100644 --- a/tests/asmtest.S +++ b/tests/asmtest.S @@ -741,6 +741,12 @@ nop .org 2b+32 .quad 1b .popsection +3: mov %eax,%ecx +4: +.pushsection .text.three, "ax" +nop +.skip (-((4b-3b) > 0) * 2) , 0x90 +.popsection movd %esi, %mm1 movd %edi, %xmm2 |