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Add splitting coercions for IND_ALL_D.

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Delete my wrong comment (from commits cfbc537, a8f62f4, 5432bd0) which
claimed that such coercions are not possible.
This commit is contained in:
George Koehler 2017-12-18 20:59:04 -05:00
parent 24abaf6a25
commit ad47fa5fe3
1 changed files with 24 additions and 16 deletions
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40
mach/powerpc/ncg/table
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@ -52,11 +52,9 @@ REGISTERS
* r13, r14, ..., r31: GPR, REG regvar(reg_any).
*/
r0, sp, fp : GPR.
r3 : GPR, REG, REG3.
r4, r5, r6, r7, r8, r9, r10, r11, r12
: GPR, REG.
r0, sp, fp, r12 : GPR.
r3 : GPR, REG, REG3.
r4, r5, r6, r7, r8, r9, r10, r11 : GPR, REG.
r13, r14, r15, r16, r17, r18, r19, r20, r21, r22, r23, r24,
r25, r26, r27, r28, r29, r30, r31
@ -88,6 +86,10 @@ REGISTERS
lr, ctr : SPR.
cr0 : CR.
/* The stacking rules and the splitting coercions can't
* allocate registers. We use r12 in the splitting coercions,
* and these scratch registers in the stacking rules.
*/
#define RSCRATCH r0
#define FSCRATCH f0
@ -697,7 +699,6 @@ STACKINGRULES
gen bug {LABEL, "STACKING DLOCAL"}
COERCIONS
from STACK
@ -733,16 +734,6 @@ COERCIONS
uses REG=%1
yields %a
/*
* There is no coercion from IND_ALL_D to REG REG, because
* coercions can't allocate registers for intermediate values.
*
* A coercion to split IND_RC_D into two IND_RC_W, without
* allocating an intermediate register, would yield
* {IND_RC_W, %1.val, %1.off+4}
* but %1.off+4 might overflow a signed 16-bit integer.
*/
from FLOAT_D
uses FREG=%1
yields %a
@ -751,6 +742,23 @@ COERCIONS
uses FSREG=%1
yields %a
/* Splitting coercions can't allocate registers.
* PowerPC can't add r0 + constant. Use r12.
*/
from IND_RC_D %off<=0x7FFA
yields
{IND_RC_W, %1.reg, %1.off+4}
{IND_RC_W, %1.reg, %1.off}
from IND_RC_D
/* Don't move to %1.reg; it might be a regvar. */
gen move {SUM_RC, %1.reg, %1.off}, r12
yields {IND_RC_W, r12, 4} {IND_RC_W, r12, 0}
from IND_RR_D
gen move {SUM_RR, %1.reg1, %1.reg2}, r12
yields {IND_RC_W, r12, 4} {IND_RC_W, r12, 0}
PATTERNS