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use truncation, not rounding in float2Int instructions

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This commit is contained in:
Joel Dice 2009-10-20 15:43:24 -06:00
parent 5967246b37
commit 064ad572bc
2 changed files with 6 additions and 2 deletions
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4
src/x86.cpp
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@ -2391,14 +2391,14 @@ float2IntRR(Context* c, unsigned aSize, Assembler::Register* a,
unsigned bSize, Assembler::Register* b) unsigned bSize, Assembler::Register* b)
{ {
assert(c, not floatReg(b)); assert(c, not floatReg(b));
floatRegOp(c, aSize, a, bSize, b, 0x2d); floatRegOp(c, aSize, a, bSize, b, 0x2c);
} }
void void
float2IntMR(Context* c, unsigned aSize, Assembler::Memory* a, float2IntMR(Context* c, unsigned aSize, Assembler::Memory* a,
unsigned bSize, Assembler::Register* b) unsigned bSize, Assembler::Register* b)
{ {
floatMemOp(c, aSize, a, bSize, b, 0x2d); floatMemOp(c, aSize, a, bSize, b, 0x2c);
} }
void void

4
test/Floats.java
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@ -61,5 +61,9 @@ public class Floats {
expect(Math.round(0.5d) == 1); expect(Math.round(0.5d) == 1);
expect(Math.round(1.0d) == 1); expect(Math.round(1.0d) == 1);
expect(Math.round(1.9d) == 2); expect(Math.round(1.9d) == 2);
float b = 1.0f;
int blue = (int)(b * 255 + 0.5);
expect(blue == 255);
} }
} }