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Unified Diff: src/arm/assembler-arm.cc

Issue 6142004: ARM: Fix comparison of NaN values.... (Closed) Base URL: http://v8.googlecode.com/svn/branches/bleeding_edge/
Patch Set: '' Created 9 years, 11 months ago
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Index: src/arm/assembler-arm.cc
===================================================================
--- src/arm/assembler-arm.cc (revision 6231)
+++ src/arm/assembler-arm.cc (working copy)
@@ -2340,12 +2340,14 @@
const SBit s,
const Condition cond) {
// vcmp(Dd, Dm) double precision floating point comparison.
+ // We set bit E, as we want any NaN to set the cumulative exception flag
+ // in the FPSCR.
// Instruction details available in ARM DDI 0406A, A8-570.
// cond(31-28) | 11101 (27-23)| D=?(22) | 11 (21-20) | 0100 (19-16) |
- // Vd(15-12) | 101(11-9) | sz(8)=1 | E(7)=? | 1(6) | M(5)=? | 0(4) | Vm(3-0)
+ // Vd(15-12) | 101(11-9) | sz(8)=1 | E(7)=1 | 1(6) | M(5)=? | 0(4) | Vm(3-0)
ASSERT(CpuFeatures::IsEnabled(VFP3));
emit(cond | 0xE*B24 |B23 | 0x3*B20 | B18 |
- src1.code()*B12 | 0x5*B9 | B8 | B6 | src2.code());
+ src1.code()*B12 | 0x5*B9 | B8 | B7 | B6 | src2.code());
}
@@ -2355,12 +2357,14 @@
const Condition cond) {
// vcmp(Dd, Dm) double precision floating point comparison.
// Instruction details available in ARM DDI 0406A, A8-570.
+ // We set bit E, as we want any NaN to set the cumulative exception flag
+ // in the FPSCR.
// cond(31-28) | 11101 (27-23)| D=?(22) | 11 (21-20) | 0101 (19-16) |
- // Vd(15-12) | 101(11-9) | sz(8)=1 | E(7)=? | 1(6) | M(5)=? | 0(4) | 0000(3-0)
+ // Vd(15-12) | 101(11-9) | sz(8)=1 | E(7)=1 | 1(6) | M(5)=? | 0(4) | 0000(3-0)
ASSERT(CpuFeatures::IsEnabled(VFP3));
ASSERT(src2 == 0.0);
emit(cond | 0xE*B24 |B23 | 0x3*B20 | B18 | B16 |
- src1.code()*B12 | 0x5*B9 | B8 | B6);
+ src1.code()*B12 | 0x5*B9 | B8 | B7 | B6);
}
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