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| author | Gabe Black <gblack@eecs.umich.edu> | 2007-09-06 16:20:12 -0700 |
|---|---|---|
| committer | Gabe Black <gblack@eecs.umich.edu> | 2007-09-06 16:20:12 -0700 |
| commit | 832ef7412b7ab35cb50613fb1b53bd32c48d5a1f (patch) | |
| tree | 3a372e58a5b5290d325ee5bdfd59554db95a451f /src | |
| parent | 389abade01f44ce7204776c0d71f89c8d3177d9d (diff) | |
| download | gem5-832ef7412b7ab35cb50613fb1b53bd32c48d5a1f.tar.xz | |
X86: Correct how the hi portion of a product is computed.
--HG--
extra : convert_revision : 1f503e1cae0374e62e6254e8073e903adc29d067
Diffstat (limited to 'src')
| -rw-r--r-- | src/arch/x86/isa/microops/regop.isa | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/arch/x86/isa/microops/regop.isa b/src/arch/x86/isa/microops/regop.isa index 57edbb606..60089085f 100644 --- a/src/arch/x86/isa/microops/regop.isa +++ b/src/arch/x86/isa/microops/regop.isa @@ -463,8 +463,8 @@ let {{ uint64_t psrc2_h = op2 >> halfSize; uint64_t psrc2_l = op2 & mask(halfSize); uint64_t result = - ((psrc1_l * psrc2_h) >> halfSize) + - ((psrc1_h * psrc2_l) >> halfSize) + + ((psrc1_l * psrc2_h + psrc1_h * psrc2_l + + ((psrc1_l * psrc2_l) >> halfSize)) >> halfSize) + psrc1_h * psrc2_h; DestReg = merge(DestReg, result, dataSize); ''' |