1 files changed, 396 insertions, 0 deletions
diff --git a/test/codegen/bits.go b/test/codegen/bits.go
new file mode 100644
index 0000000..018f5b9
--- /dev/null
+++ b/test/codegen/bits.go
@@ -0,0 +1,396 @@
+// asmcheck
+
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package codegen
+
+import "math/bits"
+
+/************************************
+ * 64-bit instructions
+ ************************************/
+
+func bitcheck64_constleft(a uint64) (n int) {
+	// amd64:"BTQ\t[$]63"
+	if a&(1<<63) != 0 {
+		return 1
+	}
+	// amd64:"BTQ\t[$]60"
+	if a&(1<<60) != 0 {
+		return 1
+	}
+	// amd64:"BTL\t[$]0"
+	if a&(1<<0) != 0 {
+		return 1
+	}
+	return 0
+}
+
+func bitcheck64_constright(a [8]uint64) (n int) {
+	// amd64:"BTQ\t[$]63"
+	if (a[0]>>63)&1 != 0 {
+		return 1
+	}
+	// amd64:"BTQ\t[$]63"
+	if a[1]>>63 != 0 {
+		return 1
+	}
+	// amd64:"BTQ\t[$]63"
+	if a[2]>>63 == 0 {
+		return 1
+	}
+	// amd64:"BTQ\t[$]60"
+	if (a[3]>>60)&1 == 0 {
+		return 1
+	}
+	// amd64:"BTL\t[$]1"
+	if (a[4]>>1)&1 == 0 {
+		return 1
+	}
+	// amd64:"BTL\t[$]0"
+	if (a[5]>>0)&1 == 0 {
+		return 1
+	}
+	// amd64:"BTL\t[$]7"
+	if (a[6]>>5)&4 == 0 {
+		return 1
+	}
+	return 0
+}
+
+func bitcheck64_var(a, b uint64) (n int) {
+	// amd64:"BTQ"
+	if a&(1<<(b&63)) != 0 {
+		return 1
+	}
+	// amd64:"BTQ",-"BT.\t[$]0"
+	if (b>>(a&63))&1 != 0 {
+		return 1
+	}
+	return 0
+}
+
+func bitcheck64_mask(a uint64) (n int) {
+	// amd64:"BTQ\t[$]63"
+	if a&0x8000000000000000 != 0 {
+		return 1
+	}
+	// amd64:"BTQ\t[$]59"
+	if a&0x800000000000000 != 0 {
+		return 1
+	}
+	// amd64:"BTL\t[$]0"
+	if a&0x1 != 0 {
+		return 1
+	}
+	return 0
+}
+
+func biton64(a, b uint64) (n uint64) {
+	// amd64:"BTSQ"
+	n += b | (1 << (a & 63))
+
+	// amd64:"BTSQ\t[$]63"
+	n += a | (1 << 63)
+
+	// amd64:"BTSQ\t[$]60"
+	n += a | (1 << 60)
+
+	// amd64:"ORQ\t[$]1"
+	n += a | (1 << 0)
+
+	return n
+}
+
+func bitoff64(a, b uint64) (n uint64) {
+	// amd64:"BTRQ"
+	n += b &^ (1 << (a & 63))
+
+	// amd64:"BTRQ\t[$]63"
+	n += a &^ (1 << 63)
+
+	// amd64:"BTRQ\t[$]60"
+	n += a &^ (1 << 60)
+
+	// amd64:"ANDQ\t[$]-2"
+	n += a &^ (1 << 0)
+
+	return n
+}
+
+func bitcompl64(a, b uint64) (n uint64) {
+	// amd64:"BTCQ"
+	n += b ^ (1 << (a & 63))
+
+	// amd64:"BTCQ\t[$]63"
+	n += a ^ (1 << 63)
+
+	// amd64:"BTCQ\t[$]60"
+	n += a ^ (1 << 60)
+
+	// amd64:"XORQ\t[$]1"
+	n += a ^ (1 << 0)
+
+	return n
+}
+
+/************************************
+ * 32-bit instructions
+ ************************************/
+
+func bitcheck32_constleft(a uint32) (n int) {
+	// amd64:"BTL\t[$]31"
+	if a&(1<<31) != 0 {
+		return 1
+	}
+	// amd64:"BTL\t[$]28"
+	if a&(1<<28) != 0 {
+		return 1
+	}
+	// amd64:"BTL\t[$]0"
+	if a&(1<<0) != 0 {
+		return 1
+	}
+	return 0
+}
+
+func bitcheck32_constright(a [8]uint32) (n int) {
+	// amd64:"BTL\t[$]31"
+	if (a[0]>>31)&1 != 0 {
+		return 1
+	}
+	// amd64:"BTL\t[$]31"
+	if a[1]>>31 != 0 {
+		return 1
+	}
+	// amd64:"BTL\t[$]31"
+	if a[2]>>31 == 0 {
+		return 1
+	}
+	// amd64:"BTL\t[$]28"
+	if (a[3]>>28)&1 == 0 {
+		return 1
+	}
+	// amd64:"BTL\t[$]1"
+	if (a[4]>>1)&1 == 0 {
+		return 1
+	}
+	// amd64:"BTL\t[$]0"
+	if (a[5]>>0)&1 == 0 {
+		return 1
+	}
+	// amd64:"BTL\t[$]7"
+	if (a[6]>>5)&4 == 0 {
+		return 1
+	}
+	return 0
+}
+
+func bitcheck32_var(a, b uint32) (n int) {
+	// amd64:"BTL"
+	if a&(1<<(b&31)) != 0 {
+		return 1
+	}
+	// amd64:"BTL",-"BT.\t[$]0"
+	if (b>>(a&31))&1 != 0 {
+		return 1
+	}
+	return 0
+}
+
+func bitcheck32_mask(a uint32) (n int) {
+	// amd64:"BTL\t[$]31"
+	if a&0x80000000 != 0 {
+		return 1
+	}
+	// amd64:"BTL\t[$]27"
+	if a&0x8000000 != 0 {
+		return 1
+	}
+	// amd64:"BTL\t[$]0"
+	if a&0x1 != 0 {
+		return 1
+	}
+	return 0
+}
+
+func biton32(a, b uint32) (n uint32) {
+	// amd64:"BTSL"
+	n += b | (1 << (a & 31))
+
+	// amd64:"BTSL\t[$]31"
+	n += a | (1 << 31)
+
+	// amd64:"BTSL\t[$]28"
+	n += a | (1 << 28)
+
+	// amd64:"ORL\t[$]1"
+	n += a | (1 << 0)
+
+	return n
+}
+
+func bitoff32(a, b uint32) (n uint32) {
+	// amd64:"BTRL"
+	n += b &^ (1 << (a & 31))
+
+	// amd64:"BTRL\t[$]31"
+	n += a &^ (1 << 31)
+
+	// amd64:"BTRL\t[$]28"
+	n += a &^ (1 << 28)
+
+	// amd64:"ANDL\t[$]-2"
+	n += a &^ (1 << 0)
+
+	return n
+}
+
+func bitcompl32(a, b uint32) (n uint32) {
+	// amd64:"BTCL"
+	n += b ^ (1 << (a & 31))
+
+	// amd64:"BTCL\t[$]31"
+	n += a ^ (1 << 31)
+
+	// amd64:"BTCL\t[$]28"
+	n += a ^ (1 << 28)
+
+	// amd64:"XORL\t[$]1"
+	n += a ^ (1 << 0)
+
+	return n
+}
+
+// check direct operation on memory with constant and shifted constant sources
+func bitOpOnMem(a []uint32, b, c, d uint32) {
+	// amd64:`ANDL\s[$]200,\s\([A-Z][A-Z0-9]+\)`
+	a[0] &= 200
+	// amd64:`ORL\s[$]220,\s4\([A-Z][A-Z0-9]+\)`
+	a[1] |= 220
+	// amd64:`XORL\s[$]240,\s8\([A-Z][A-Z0-9]+\)`
+	a[2] ^= 240
+}
+
+func bitcheckMostNegative(b uint8) bool {
+	// amd64:"TESTB"
+	return b&0x80 == 0x80
+}
+
+// Check AND masking on arm64 (Issue #19857)
+
+func and_mask_1(a uint64) uint64 {
+	// arm64:`AND\t`
+	return a & ((1 << 63) - 1)
+}
+
+func and_mask_2(a uint64) uint64 {
+	// arm64:`AND\t`
+	return a & (1 << 63)
+}
+
+func and_mask_3(a, b uint32) (uint32, uint32) {
+	// arm/7:`BIC`,-`AND`
+	a &= 0xffffaaaa
+	// arm/7:`BFC`,-`AND`,-`BIC`
+	b &= 0xffc003ff
+	return a, b
+}
+
+// Check generation of arm64 BIC/EON/ORN instructions
+
+func op_bic(x, y uint32) uint32 {
+	// arm64:`BIC\t`,-`AND`
+	return x &^ y
+}
+
+func op_eon(x, y, z uint32, a []uint32, n, m uint64) uint64 {
+	// arm64:`EON\t`,-`EOR`,-`MVN`
+	a[0] = x ^ (y ^ 0xffffffff)
+
+	// arm64:`EON\t`,-`EOR`,-`MVN`
+	a[1] = ^(y ^ z)
+
+	// arm64:`EON\t`,-`XOR`
+	a[2] = x ^ ^z
+
+	// arm64:`EON\t`,-`EOR`,-`MVN`
+	return n ^ (m ^ 0xffffffffffffffff)
+}
+
+func op_orn(x, y uint32) uint32 {
+	// arm64:`ORN\t`,-`ORR`
+	return x | ^y
+}
+
+// check bitsets
+func bitSetPowerOf2Test(x int) bool {
+	// amd64:"BTL\t[$]3"
+	return x&8 == 8
+}
+
+func bitSetTest(x int) bool {
+	// amd64:"ANDL\t[$]9, AX"
+	// amd64:"CMPQ\tAX, [$]9"
+	return x&9 == 9
+}
+
+// mask contiguous one bits
+func cont1Mask64U(x uint64) uint64 {
+	// s390x:"RISBGZ\t[$]16, [$]47, [$]0,"
+	return x & 0x0000ffffffff0000
+}
+
+// mask contiguous zero bits
+func cont0Mask64U(x uint64) uint64 {
+	// s390x:"RISBGZ\t[$]48, [$]15, [$]0,"
+	return x & 0xffff00000000ffff
+}
+
+func issue44228a(a []int64, i int) bool {
+	// amd64: "BTQ", -"SHL"
+	return a[i>>6]&(1<<(i&63)) != 0
+}
+func issue44228b(a []int32, i int) bool {
+	// amd64: "BTL", -"SHL"
+	return a[i>>5]&(1<<(i&31)) != 0
+}
+
+func issue48467(x, y uint64) uint64 {
+	// arm64: -"NEG"
+	d, borrow := bits.Sub64(x, y, 0)
+	return x - d&(-borrow)
+}
+
+func foldConst(x, y uint64) uint64 {
+	// arm64: "ADDS\t[$]7",-"MOVD\t[$]7"
+	d, b := bits.Add64(x, 7, 0)
+	return b & d
+}
+
+func foldConstOutOfRange(a uint64) uint64 {
+	// arm64: "MOVD\t[$]19088744",-"ADD\t[$]19088744"
+	return a + 0x1234568
+}
+
+// Verify sign-extended values are not zero-extended under a bit mask (#61297)
+func signextendAndMask8to64(a int8) (s, z uint64) {
+	// ppc64x: "MOVB", "ANDCC\t[$]1015,"
+	s = uint64(a) & 0x3F7
+	// ppc64x: -"MOVB", "ANDCC\t[$]247,"
+	z = uint64(uint8(a)) & 0x3F7
+	return
+
+}
+
+// Verify zero-extended values are not sign-extended under a bit mask (#61297)
+func zeroextendAndMask8to64(a int8, b int16) (x, y uint64) {
+	// ppc64x: -"MOVB\t", -"ANDCC", "MOVBZ"
+	x = uint64(a) & 0xFF
+	// ppc64x: -"MOVH\t", -"ANDCC", "MOVHZ"
+	y = uint64(b) & 0xFFFF
+	return
+
+}