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Bug 1205232 - IonMonkey: MIPS32: Fix rounding of big negative float32 values in Ion. r=bbouvier

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---
 js/src/jit/mips32/CodeGenerator-mips32.cpp | 32 ++++++++++++++++++++++--------
 1 file changed, 24 insertions(+), 8 deletions(-)
This commit is contained in:
Heiher 2015-09-30 07:03:10 +08:00
parent 246c121179
commit 9aa36719a4
1 changed files with 24 additions and 8 deletions
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32
js/src/jit/mips32/CodeGenerator-mips32.cpp
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@ -1202,8 +1202,8 @@ CodeGeneratorMIPS::visitRound(LRound* lir)
Label bail, negative, end, skipCheck; Label bail, negative, end, skipCheck;
// Load 0.5 in the temp register. // Load biggest number less than 0.5 in the temp register.
masm.loadConstantDouble(0.5, temp); masm.loadConstantDouble(GetBiggestNumberLessThan(0.5), temp);
// Branch to a slow path for negative inputs. Doesn't catch NaN or -0. // Branch to a slow path for negative inputs. Doesn't catch NaN or -0.
masm.loadConstantDouble(0.0, scratch); masm.loadConstantDouble(0.0, scratch);
@ -1221,8 +1221,7 @@ CodeGeneratorMIPS::visitRound(LRound* lir)
masm.ma_b(&end, ShortJump); masm.ma_b(&end, ShortJump);
masm.bind(&skipCheck); masm.bind(&skipCheck);
masm.loadConstantDouble(0.5, scratch); masm.as_addd(scratch, input, temp);
masm.addDouble(input, scratch);
masm.as_floorwd(scratch, scratch); masm.as_floorwd(scratch, scratch);
masm.moveFromDoubleLo(scratch, output); masm.moveFromDoubleLo(scratch, output);
@ -1234,6 +1233,15 @@ CodeGeneratorMIPS::visitRound(LRound* lir)
// Input is negative, but isn't -0. // Input is negative, but isn't -0.
masm.bind(&negative); masm.bind(&negative);
// Inputs in ]-0.5; 0] need to be added 0.5, other negative inputs need to
// be added the biggest double less than 0.5.
Label loadJoin;
masm.loadConstantDouble(-0.5, scratch);
masm.branchDouble(Assembler::DoubleLessThan, input, scratch, &loadJoin);
masm.loadConstantDouble(0.5, temp);
masm.bind(&loadJoin);
masm.addDouble(input, temp); masm.addDouble(input, temp);
// If input + 0.5 >= 0, input is a negative number >= -0.5 and the // If input + 0.5 >= 0, input is a negative number >= -0.5 and the
@ -1261,8 +1269,8 @@ CodeGeneratorMIPS::visitRoundF(LRoundF* lir)
Label bail, negative, end, skipCheck; Label bail, negative, end, skipCheck;
// Load 0.5 in the temp register. // Load biggest number less than 0.5 in the temp register.
masm.loadConstantFloat32(0.5, temp); masm.loadConstantFloat32(GetBiggestNumberLessThan(0.5f), temp);
// Branch to a slow path for negative inputs. Doesn't catch NaN or -0. // Branch to a slow path for negative inputs. Doesn't catch NaN or -0.
masm.loadConstantFloat32(0.0f, scratch); masm.loadConstantFloat32(0.0f, scratch);
@ -1280,8 +1288,7 @@ CodeGeneratorMIPS::visitRoundF(LRoundF* lir)
masm.ma_b(&end, ShortJump); masm.ma_b(&end, ShortJump);
masm.bind(&skipCheck); masm.bind(&skipCheck);
masm.loadConstantFloat32(0.5, scratch); masm.as_adds(scratch, input, temp);
masm.as_adds(scratch, input, scratch);
masm.as_floorws(scratch, scratch); masm.as_floorws(scratch, scratch);
masm.moveFromFloat32(scratch, output); masm.moveFromFloat32(scratch, output);
@ -1293,6 +1300,15 @@ CodeGeneratorMIPS::visitRoundF(LRoundF* lir)
// Input is negative, but isn't -0. // Input is negative, but isn't -0.
masm.bind(&negative); masm.bind(&negative);
// Inputs in ]-0.5; 0] need to be added 0.5, other negative inputs need to
// be added the biggest double less than 0.5.
Label loadJoin;
masm.loadConstantFloat32(-0.5f, scratch);
masm.branchFloat(Assembler::DoubleLessThan, input, scratch, &loadJoin);
masm.loadConstantFloat32(0.5f, temp);
masm.bind(&loadJoin);
masm.as_adds(temp, input, temp); masm.as_adds(temp, input, temp);
// If input + 0.5 >= 0, input is a negative number >= -0.5 and the // If input + 0.5 >= 0, input is a negative number >= -0.5 and the