Rename intel to x86.

x86 is the more accurate name, as there are non-Intel x86 implementations.

Fixes #263.

cranelift/filetests/isa/x86/baseline_clz_ctz_popcount.cton

@@ -0,0 +1,94 @@
+
+test compile
+set is_64bit
+isa x86 baseline
+
+
+; clz/ctz on 64 bit operands
+
+function %i64_clz(i64) -> i64 {
+ebb0(v10: i64):
+  v11 = clz v10
+  ; check: x86_bsr
+  ; check: selectif.i64
+  return v11
+}
+
+function %i64_ctz(i64) -> i64 {
+ebb1(v20: i64):
+  v21 = ctz v20
+  ; check: x86_bsf
+  ; check: selectif.i64
+  return v21
+}
+
+
+; clz/ctz on 32 bit operands
+
+function %i32_clz(i32) -> i32 {
+ebb0(v10: i32):
+  v11 = clz v10
+  ; check: x86_bsr
+  ; check: selectif.i32
+  return v11
+}
+
+function %i32_ctz(i32) -> i32 {
+ebb1(v20: i32):
+  v21 = ctz v20
+  ; check: x86_bsf
+  ; check: selectif.i32
+  return v21
+}
+
+
+; popcount on 64 bit operands
+
+function %i64_popcount(i64) -> i64 {
+ebb0(v30: i64):
+  v31 = popcnt v30;
+  ; check: ushr_imm
+  ; check: iconst.i64
+  ; check: band
+  ; check: isub
+  ; check: ushr_imm
+  ; check: band
+  ; check: isub
+  ; check: ushr_imm
+  ; check: band
+  ; check: isub
+  ; check: ushr_imm
+  ; check: iadd
+  ; check: iconst.i64
+  ; check: band
+  ; check: iconst.i64
+  ; check: imul
+  ; check: ushr_imm
+  return v31;
+}
+
+
+; popcount on 32 bit operands
+
+function %i32_popcount(i32) -> i32 {
+ebb0(v40: i32):
+  v41 = popcnt v40;
+  ; check: ushr_imm
+  ; check: iconst.i32
+  ; check: band
+  ; check: isub
+  ; check: ushr_imm
+  ; check: band
+  ; check: isub
+  ; check: ushr_imm
+  ; check: band
+  ; check: isub
+  ; check: ushr_imm
+  ; check: iadd
+  ; check: iconst.i32
+  ; check: band
+  ; check: iconst.i32
+  ; check: imul
+  ; check: ushr_imm
+  return v41;
+}