5ld: stoped generating 64-bit eor

R=rsc
CC=golang-dev
https://golang.org/cl/4182049

diff --git a/src/cmd/5l/asm.c b/src/cmd/5l/asm.c
index de6b89cfe8f61d52bc4e7eb0cae738255a0201d2..7163997c0f5676f10f84f94686d659e3be3f5e2c 100644 (file)
--- a/src/cmd/5l/asm.c
+++ b/src/cmd/5l/asm.c
@@ -1470,15 +1470,24 @@ if(debug['G']) print("%ux: %s: arm %d %d %d\n", (uint32)(p->pc), p->from.sym->na
                o1 |= (p->scond & C_SCOND) << 28;
                break;
        case 80:        /* fmov zfcon,freg */
-               if((p->scond & C_SCOND) != C_SCOND_NONE)
-                       diag("floating point cannot be conditional");   // cant happen
-               o1 = 0xf3000110;        // EOR 64
-
-               // always clears the double float register
+               if(p->as == AMOVD) {
+                       o1 = 0xeeb00b00;        // VMOV imm 64
+                       o2 = oprrr(ASUBD, p->scond);
+               } else {
+                       o1 = 0x0eb00a00;        // VMOV imm 32
+                       o2 = oprrr(ASUBF, p->scond);
+               }
+               v = 0x70;       // 1.0
                r = p->to.reg;
-               o1 |= r << 0;
+
+               // movf $1.0, r
+               o1 |= (p->scond & C_SCOND) << 28;
                o1 |= r << 12;
-               o1 |= r << 16;
+               o1 |= (v&0xf) << 0;
+               o1 |= (v&0xf0) << 12;
+
+               // subf r,r,r
+               o2 |= r | (r<<16) | (r<<12);
                break;
        case 81:        /* fmov sfcon,freg */
                o1 = 0x0eb00a00;                // VMOV imm 32