Use subfic (val - reg) and mulli (reg * val).
In the instruction list, put /* kills xer */ for sraw, srawi, subfic;
and correct the (now unused) "addi." and "lfdu".
Change MACHOPT_F from -m3 to -m2. This changes the code for 15 * i
from
slwi r3,r4,4
subfic r5,r4,0
add r3,r3,r5
to
mulli r3,r4,15
If the sequence "slwi subfic addi" takes 3 cycles and 12 bytes, and
mulli takes 3 cycles and 4 bytes, then mulli is better.
This commit is contained in:
George Koehler
parent
7c9c4f82fd
commit
3dae9e49cc
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@ -170,8 +170,10 @@ TOKENS
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SUM_RL = { GPR reg; ADDR adr; } 4. /* reg + lo16[adr] */
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SUM_RR = { GPR reg1; GPR reg2; } 4. /* reg1 + reg2 */
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SUB_CR = { INT val; GPR reg; } 4. /* val - reg */
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SUB_RR = { GPR reg1; GPR reg2; } 4. /* reg1 - reg2 */
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NEG_R = { GPR reg; } 4. /* -reg */
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MUL_RC = { GPR reg; INT val; } 4. /* reg * val */
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MUL_RR = { GPR reg1; GPR reg2; } 4. /* reg1 * reg2 */
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DIV_RR = { GPR reg1; GPR reg2; } 4. /* reg1 / reg2 signed */
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DIV_RR_U = { GPR reg1; GPR reg2; } 4. /* reg1 / reg2 unsigned */
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@ -280,9 +282,10 @@ SETS
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/* any integer from stack that we can easily move to GPR */
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INT_W = SPFP + REG + CONST_STACK + SEX_B + SEX_H +
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SUM_RIS + SUM_RC + SUM_RL + SUM_RR +
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SUB_RR + NEG_R + MUL_RR + DIV_RR + DIV_RR_U +
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SUB_CR + SUB_RR + NEG_R +
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MUL_RC + MUL_RR + DIV_RR + DIV_RR_U +
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IND_ALL_B + IND_ALL_H + IND_ALL_W +
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FRAME_B + FRAME_H + FRAME_H_S + FRAME_W +
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FRAME_B + FRAME_H + FRAME_H_S + FRAME_W +
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NOT_R + AND_RIS + AND_RC + AND_RR + ANDC_RR +
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OR_RIS + OR_RC + OR_RR + ORC_RR +
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XOR_RIS + XOR_RC + XOR_RR + NAND_RR + NOR_RR + EQV_RR +
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@ -307,7 +310,7 @@ INSTRUCTIONS
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cost(4, 1) /* space, time */
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add GPR:wo, GPR:ro, GPR:ro.
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addX "add." GPR:wo, GPR:ro, GPR:ro.
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addX "add." GPR:wo:cc, GPR:ro, GPR:ro.
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addi GPR:wo, GPR:ro, CONST+LABEL_LO:ro.
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li GPR:wo, CONST:ro.
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addis GPR:wo, GPR:ro, CONST+LABEL_HI+LABEL_HA:ro.
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@ -365,7 +368,7 @@ INSTRUCTIONS
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lbz GPR:wo, SET_RC_B:ro cost(4, 3).
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lbzx GPR:wo, GPR:ro, GPR:ro cost(4, 3).
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lfd FPR+DLOCAL:wo, SET_RC_D:ro cost(4, 5).
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lfdu FPR:wo, IND_RC_D:ro cost(4, 5).
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lfdu FPR:wo, IND_RC_D:rw cost(4, 5).
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lfdx FPR:wo, GPR:ro, GPR:ro cost(4, 5).
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lfs FSREG+LOCAL:wo, SET_RC_W:ro cost(4, 4).
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lfsu FSREG:wo, IND_RC_W:rw cost(4, 4).
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@ -380,6 +383,7 @@ INSTRUCTIONS
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mfcr GPR:wo cost(4,2).
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mfspr GPR:wo, SPR:ro cost(4, 3).
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mtspr SPR:wo, GPR:ro cost(4, 2).
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mulli GPR:wo, GPR:ro, CONST:ro cost(4, 3).
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mullw GPR:wo, GPR:ro, GPR:ro cost(4, 4).
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nand GPR:wo, GPR:ro, GPR:ro.
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neg GPR:wo, GPR:ro.
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@ -401,8 +405,8 @@ INSTRUCTIONS
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rlwnm GPR:wo, GPR:ro, GPR:ro, CONST:ro, CONST:ro.
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rotlw GPR+LOCAL:wo, GPR:ro, GPR:ro.
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slw GPR+LOCAL:wo, GPR:ro, GPR:ro.
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sraw GPR+LOCAL:wo, GPR:ro, GPR:ro cost(4, 2).
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srawi GPR+LOCAL:wo, GPR:ro, CONST:ro cost(4, 2).
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sraw GPR+LOCAL:wo, GPR:ro, GPR:ro /* kills xer */ cost(4, 2).
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srawi GPR+LOCAL:wo, GPR:ro, CONST:ro /* kills xer */ cost(4, 2).
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srw GPR+LOCAL:wo, GPR:ro, GPR:ro.
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stb GPR:ro, SET_RC_B:rw cost(4, 3).
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stbx GPR:ro, GPR:ro, GPR:ro cost(4, 3).
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@ -418,6 +422,7 @@ INSTRUCTIONS
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stwx GPR:ro, GPR:ro, GPR:ro cost(4, 3).
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stwu GPR:ro, IND_RC_W:rw cost(4, 3).
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subf GPR:wo, GPR:ro, GPR:ro.
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subfic GPR:wo, GPR:ro, CONST:ro /* kills xer */.
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xor GPR:wo, GPR:ro, GPR:ro.
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xori GPR:wo, GPR:ro, CONST:ro.
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xoris GPR:wo, GPR:ro, CONST:ro.
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@ -490,6 +495,10 @@ MOVES
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/* Other arithmetic */
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from SUB_CR to GPR
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/* val - reg -> subtract reg from val */
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gen subfic %2, %1.reg, {C, %1.val}
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from SUB_RR to GPR
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/* reg1 - reg2 -> subtract reg2 from reg1 */
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gen subf %2, %1.reg2, %1.reg1
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@ -497,6 +506,9 @@ MOVES
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from NEG_R to GPR
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gen neg %2, %1.reg
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from MUL_RC to GPR
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gen mulli %2, %1.reg, {C, %1.val}
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from MUL_RR to GPR
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gen mullw %2, %1.reg1, %1.reg2
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@ -1471,6 +1483,8 @@ PATTERNS
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yields {SUB_RR, %2, %1}
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with CONST2_WHEN_NEG REG
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yields {SUM_RC, %2, 0-%1.val}
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with REG CONST2
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yields {SUB_CR, %2.val, %1}
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with CONST_HI_ZR REG
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yields {SUM_RIS, %2, his(0-%1.val)}
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with CONST_STACK-CONST2_WHEN_NEG-CONST_HI_ZR REG
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@ -1482,6 +1496,10 @@ PATTERNS
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yields {NEG_R, %1}
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pat mli $1==4 /* Multiply word (second * top) */
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with CONST2 REG
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yields {MUL_RC, %2, %1.val}
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with REG CONST2
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yields {MUL_RC, %1, %2.val}
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with REG REG
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yields {MUL_RR, %2, %1}
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@ -19,7 +19,7 @@ var PLATFORM=linuxppc
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var PLATFORMDIR={EM}/share/ack/{PLATFORM}
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var CPP_F=-D__unix
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var ALIGN=-a0:4 -a1:4 -a2:4 -a3:4 -b0:0x10000054
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var MACHOPT_F=-m3
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var MACHOPT_F=-m2
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var EGO_PLAT_FLAGS=-M{EM}/share/ack/ego/{ARCH}.descr
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# Override the setting in fe so that files compiled for linuxppc can see
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@ -19,7 +19,7 @@ var PLATFORM=osxppc
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var PLATFORMDIR={EM}/share/ack/{PLATFORM}
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var CPP_F=-D__unix
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var ALIGN=-a0:4 -a1:4 -a2:4096 -a3:4 -b0:0x129c
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var MACHOPT_F=-m3
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var MACHOPT_F=-m2
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var EGO_PLAT_FLAGS=-M{EM}/share/ack/ego/{ARCH}.descr
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# Override the setting in fe so that files compiled for osxppc can see
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