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load sign extended bytes (#21004)

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* carith() function in exe1.c tests

* load sign extended bytes
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Walter Bright 2025-03-16 09:33:19 -07:00 • committed by GitHub
parent cf2674f689
commit 726c50e5bd
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2 changed files with 8 additions and 3 deletions
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9
compiler/src/dmd/backend/arm/cod1.d
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@ -56,6 +56,7 @@ nothrow:
*/ */
void loadFromEA(ref code cs, reg_t reg, uint szw, uint szr) void loadFromEA(ref code cs, reg_t reg, uint szw, uint szr)
{ {
//debug printf("loadFromEA() reg: %d, szw: %d, szr: %d\n", reg, szw, szr);
cs.Iop = INSTR.nop; cs.Iop = INSTR.nop;
assert(reg != NOREG); assert(reg != NOREG);
if (mask(reg) & INSTR.FLOATREGS) // if floating point store if (mask(reg) & INSTR.FLOATREGS) // if floating point store
@ -83,6 +84,8 @@ void loadFromEA(ref code cs, reg_t reg, uint szw, uint szr)
return; return;
} }
bool signExtend = (cs.Sextend & 7) == Extend.SXTB;
if (cs.reg != NOREG) if (cs.reg != NOREG)
{ {
if (cs.reg != reg) // do not mov onto itself if (cs.reg != reg) // do not mov onto itself
@ -103,9 +106,11 @@ void loadFromEA(ref code cs, reg_t reg, uint szw, uint szr)
{ {
// LDRB/LDRH/LDR reg,[cs.base, #0] // LDRB/LDRH/LDR reg,[cs.base, #0]
if (szr == 1) if (szr == 1)
cs.Iop = INSTR.ldrb_imm(szw == 8, reg, cs.base, 0); cs.Iop = signExtend ? INSTR.ldrsb_imm(szw == 8, reg, cs.base, 0)
: INSTR.ldrb_imm (szw == 8, reg, cs.base, 0);
else if (szr == 2) else if (szr == 2)
cs.Iop = INSTR.ldrh_imm(szw == 8, reg, cs.base, 0); cs.Iop = signExtend ? INSTR.ldrsh_imm(szw == 8, reg, cs.base, 0)
: INSTR.ldrh_imm (szw == 8, reg, cs.base, 0);
else else
cs.Iop = INSTR.ldr_imm_gen(szw == 8, reg, cs.base, 0); cs.Iop = INSTR.ldr_imm_gen(szw == 8, reg, cs.base, 0);
} }

2
compiler/src/dmd/backend/arm/cod4.d
View file

@ -1728,7 +1728,7 @@ void cdbyteint(ref CGstate cg, ref CodeBuilder cdb,elem* e,ref regm_t pretregs)
{ {
code cs; code cs;
getlvalue(cdb,cs,e1,0,RM.load); getlvalue(cdb,cs,e1,0,RM.load);
Extend extend = OPu8_16 ? Extend.UXTB : Extend.SXTB; Extend extend = (op == OPu8_16) ? Extend.UXTB : Extend.SXTB;
cs.Sextend = cast(ubyte)((cs.Sextend & 0x100) | extend); cs.Sextend = cast(ubyte)((cs.Sextend & 0x100) | extend);
reg_t reg = allocreg(cdb,retregs,TYint); reg_t reg = allocreg(cdb,retregs,TYint);
loadFromEA(cs,reg,4,1); loadFromEA(cs,reg,4,1);