MIPS: Coding style cleanups of access of FCSR rounding mode bits

Replaces references to the magic number 0x3 with constants and macros
indicating the real purpose of those bits.  They are the rounding mode
bits of the FCSR register.

Signed-off-by: Shane McDonald <mcdonald.shane@gmail.com>
To: anemo@mba.ocn.ne.jp
To: kevink@paralogos.com
To: linux-mips@linux-mips.org
To: sshtylyov@mvista.com
Patchwork: http://patchwork.linux-mips.org/patch/1206/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c
index f2338d1c0b4889a0bf216f1af9ac9e8adedb3ec1..47842b7d26aef27f4e4d361c41c7484157816cc0 100644 (file)
--- a/arch/mips/math-emu/cp1emu.c
+++ b/arch/mips/math-emu/cp1emu.c
@@ -354,7 +354,8 @@ static int cop1Emulate(struct pt_regs *xcp, struct mips_fpu_struct *ctx)
 
                        if (MIPSInst_RD(ir) == FPCREG_CSR) {
                                value = ctx->fcr31;
-                               value = (value & ~0x3) | mips_rm[value & 0x3];
+                               value = (value & ~FPU_CSR_RM) |
+                                       mips_rm[modeindex(value)];
 #ifdef CSRTRACE
                                printk("%p gpr[%d]<-csr=%08x\n",
                                        (void *) (xcp->cp0_epc),
@@ -907,7 +908,7 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
                        ieee754sp fs;
 
                        SPFROMREG(fs, MIPSInst_FS(ir));
-                       ieee754_csr.rm = ieee_rm[MIPSInst_FUNC(ir) & 0x3];
+                       ieee754_csr.rm = ieee_rm[modeindex(MIPSInst_FUNC(ir))];
                        rv.w = ieee754sp_tint(fs);
                        ieee754_csr.rm = oldrm;
                        rfmt = w_fmt;
@@ -933,7 +934,7 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
                        ieee754sp fs;
 
                        SPFROMREG(fs, MIPSInst_FS(ir));
-                       ieee754_csr.rm = ieee_rm[MIPSInst_FUNC(ir) & 0x3];
+                       ieee754_csr.rm = ieee_rm[modeindex(MIPSInst_FUNC(ir))];
                        rv.l = ieee754sp_tlong(fs);
                        ieee754_csr.rm = oldrm;
                        rfmt = l_fmt;
@@ -1081,7 +1082,7 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
                        ieee754dp fs;
 
                        DPFROMREG(fs, MIPSInst_FS(ir));
-                       ieee754_csr.rm = ieee_rm[MIPSInst_FUNC(ir) & 0x3];
+                       ieee754_csr.rm = ieee_rm[modeindex(MIPSInst_FUNC(ir))];
                        rv.w = ieee754dp_tint(fs);
                        ieee754_csr.rm = oldrm;
                        rfmt = w_fmt;
@@ -1107,7 +1108,7 @@ static int fpu_emu(struct pt_regs *xcp, struct mips_fpu_struct *ctx,
                        ieee754dp fs;
 
                        DPFROMREG(fs, MIPSInst_FS(ir));
-                       ieee754_csr.rm = ieee_rm[MIPSInst_FUNC(ir) & 0x3];
+                       ieee754_csr.rm = ieee_rm[modeindex(MIPSInst_FUNC(ir))];
                        rv.l = ieee754dp_tlong(fs);
                        ieee754_csr.rm = oldrm;
                        rfmt = l_fmt;