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Remove one more branch from l8ui code path

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Thanks for @foogod for the heads-up on this.
This commit is contained in:
Angus Gratton 2015-09-15 07:37:38 +10:00
parent 26e1ce325e
commit 3911a94cc8
1 changed files with 14 additions and 18 deletions
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32
core/exception_vectors.S
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@ -265,29 +265,16 @@ InnerLoadStoreExceptionHandler:
l32i a4, a2, 4
src a2, a4, a3 // a2 now instruction that failed
/* Check if a2 matches l8ui, l16ui or l16si opcodes */
movi a3, 0x00F00F /* opcode mask */
/* Check if a2 matches l16ui, l16si or l8ui opcode */
movi a3, 0x00700F /* opcode mask */
and a3, a2, a3
beqi a3, 0x000002, .Lcan_fix_8bit /* l8ui opcode after masking */
movi a4, 0x001002 /* l16ui opcode after masking */
movi a4, 0x001002 /* l16si or l16ui opcode after masking */
beq a3, a4, .Lcan_fix_16bit
movi a4, 0x009002 /* l16si opcode after masking */
beq a3, a4, .Lcan_fix_16bit_signed
.Lcant_fix:
/* not an opcode we can try to fix, so bomb out
TODO: the exception dump will have some wrong values in it */
call0 sdk_user_fatal_exception_handler
.Lcan_fix_16bit_signed:
movi a5, 0x7FFF
j .Lcan_fix
.Lcan_fix_16bit:
movi a5, 0xFFFF
j .Lcan_fix
.Lcan_fix_8bit:
bnei a3, 0x000002, .Lcant_fix /* no l8ui opcode, then can't fix */
movi a5, 0xFF
.Lcan_fix:
/* verified an 8- or 16-bit read
a2 holds instruction, a5 holds mask to apply to read value
@ -335,6 +322,15 @@ InnerLoadStoreExceptionHandler:
addi sp, sp, 0x18
rfe
.Lcan_fix_16bit:
movi a5, 0xFFFF
j .Lcan_fix
.Lcant_fix:
/* not an opcode we can try to fix, so bomb out
TODO: the exception dump will have some wrong values in it */
call0 sdk_user_fatal_exception_handler
.Lincrement_PC_intlevel2:
rsr.epc2 a2
addi a3, a2, 0x3