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Re: [PATCH,i386] fix PR 11001
On Fri, Oct 12, 2007 at 09:40:27AM -0700, H.J. Lu wrote:
> On Fri, Oct 12, 2007 at 09:12:47AM -0700, Nathan Froyd wrote:
> > + /* Can't use this if the user has appropriated eax, ecx, or edi. */
> > + if (global_regs[0] || global_regs[2] || global_regs[5])
> > + return false;
> > +
>
> Can you use/add AX_REG, CX_REG, DI_REG, SI_REG instead using 0, 2,
> 4, 5?
Sure. Patch below. OK to commit if it passes bootstrap/testing?
-Nathan
2007-10-12 Nathan Froyd <froydnj@codesourcery.com>
* config/i386/i386.md (SI_REG, DI_REG): New constants.
(strmov): Use defined constants.
(cmpstrnsi): Likewise.
* config/i386/i386.c (decide_alg): Use defined constants.
(ix86_expand_strlen): Likewise.
Index: i386.c
===================================================================
--- i386.c (revision 129265)
+++ i386.c (working copy)
@@ -15060,8 +15060,8 @@ decide_alg (HOST_WIDE_INT count, HOST_WI
additionally, memset wants eax and memcpy wants esi. Don't
consider such algorithms if the user has appropriated those
registers for their own purposes. */
- bool rep_prefix_usable = !(global_regs[2] || global_regs[5]
- || (memset ? global_regs[0] : global_regs[4]));
+ bool rep_prefix_usable = !(global_regs[CX_REG] || global_regs[DI_REG]
+ || (memset ? global_regs[AX_REG] : global_regs[SI_REG]));
#define ALG_USABLE_P(alg) (rep_prefix_usable \
|| (alg != rep_prefix_1_byte \
@@ -16022,7 +16022,7 @@ ix86_expand_strlen (rtx out, rtx src, rt
rtx unspec;
/* Can't use this if the user has appropriated eax, ecx, or edi. */
- if (global_regs[0] || global_regs[2] || global_regs[5])
+ if (global_regs[AX_REG] || global_regs[CX_REG] || global_regs[DI_REG])
return false;
scratch2 = gen_reg_rtx (Pmode);
Index: i386.md
===================================================================
--- i386.md (revision 129265)
+++ i386.md (working copy)
@@ -222,6 +222,8 @@ (define_constants
[(AX_REG 0)
(DX_REG 1)
(CX_REG 2)
+ (SI_REG 4)
+ (DI_REG 5)
(BP_REG 6)
(SP_REG 7)
(FLAGS_REG 17)
@@ -18704,7 +18706,7 @@ (define_expand "strmov"
/* Can't use this if the user has appropriated esi or edi. */
if ((TARGET_SINGLE_STRINGOP || optimize_size)
- && !(global_regs[4] || global_regs[5]))
+ && !(global_regs[SI_REG] || global_regs[DI_REG]))
{
emit_insn (gen_strmov_singleop (operands[0], operands[1],
operands[2], operands[3],
@@ -19190,7 +19192,7 @@ (define_expand "cmpstrnsi"
rtx addr1, addr2, out, outlow, count, countreg, align;
/* Can't use this if the user has appropriated esi or edi. */
- if (global_regs[4] || global_regs[5])
+ if (global_regs[SI_REG] || global_regs[DI_REG])
FAIL;
out = operands[0];