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[SystemZ] Add comparisons of large immediates using high words

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There are no corresponding patterns for small immediates because they would
prevent the use of fused compare-and-branch instructions.

llvm-svn: 191775
This commit is contained in:
Richard Sandiford 2013-10-01 14:56:23 +00:00
parent 3b7b53e6f4
commit 2ed79fb1d7
7 changed files with 134 additions and 2 deletions
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8
lib/Target/SystemZ/SystemZInstrInfo.cpp
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@ -966,6 +966,14 @@ SystemZInstrInfo::expandPostRAPseudo(MachineBasicBlock::iterator MI) const {
expandRIPseudo(MI, SystemZ::AFI, SystemZ::AIH, false);
return true;
case SystemZ::CFIMux:
expandRIPseudo(MI, SystemZ::CFI, SystemZ::CIH, false);
return true;
case SystemZ::CLFIMux:
expandRIPseudo(MI, SystemZ::CLFI, SystemZ::CLIH, false);
return true;
case SystemZ::RISBMux: {
bool DestIsHigh = isHighReg(MI->getOperand(0).getReg());
bool SrcIsHigh = isHighReg(MI->getOperand(2).getReg());

14
lib/Target/SystemZ/SystemZInstrInfo.td
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@ -1076,8 +1076,13 @@ let Defs = [CC], CCValues = 0xE in {
def CHI : CompareRI<"chi", 0xA7E, z_scmp, GR32, imm32sx16>;
def CGHI : CompareRI<"cghi", 0xA7F, z_scmp, GR64, imm64sx16>;
// Comparison with a signed 32-bit immediate.
// Comparison with a signed 32-bit immediate. CFIMux expands to CFI or CIH,
// depending on the choice of register.
def CFIMux : CompareRIPseudo<z_scmp, GRX32, simm32>,
Requires<[FeatureHighWord]>;
def CFI : CompareRIL<"cfi", 0xC2D, z_scmp, GR32, simm32>;
def CIH : CompareRIL<"cih", 0xCCD, z_scmp, GRH32, simm32>,
Requires<[FeatureHighWord]>;
def CGFI : CompareRIL<"cgfi", 0xC2C, z_scmp, GR64, imm64sx32>;
// Comparison with memory.
@ -1106,8 +1111,13 @@ let Defs = [CC], CCValues = 0xE, IsLogical = 1 in {
def CLGFR : CompareRRE<"clgf", 0xB931, null_frag, GR64, GR32>;
def CLGR : CompareRRE<"clg", 0xB921, z_ucmp, GR64, GR64>;
// Comparison with a signed 32-bit immediate.
// Comparison with an unsigned 32-bit immediate. CLFIMux expands to CLFI
// or CLIH, depending on the choice of register.
def CLFIMux : CompareRIPseudo<z_ucmp, GRX32, uimm32>,
Requires<[FeatureHighWord]>;
def CLFI : CompareRIL<"clfi", 0xC2F, z_ucmp, GR32, uimm32>;
def CLIH : CompareRIL<"clih", 0xCCF, z_ucmp, GR32, uimm32>,
Requires<[FeatureHighWord]>;
def CLGFI : CompareRIL<"clgfi", 0xC2E, z_ucmp, GR64, imm64zx32>;
// Comparison with memory.

34
test/CodeGen/SystemZ/asm-18.ll
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@ -669,3 +669,37 @@ define void @f30() {
call void asm sideeffect "stepd $0", "r"(i32 %add3)
ret void
}
; Test large immediate comparison involving high registers.
define i32 @f31() {
; CHECK-LABEL: f31:
; CHECK: stepa [[REG1:%r[0-5]]]
; CHECK: cih [[REG1]], 1000000000
; CHECK: stepb [[REG2:%r[0-5]]]
; CHECK: clih [[REG2]], 1000000000
; CHECK: br %r14
%res1 = call i32 asm "stepa $0", "=h"()
%cmp1 = icmp sle i32 %res1, 1000000000
%sel1 = select i1 %cmp1, i32 0, i32 1
%res2 = call i32 asm "stepb $0, $1", "=h,r"(i32 %sel1)
%cmp2 = icmp ule i32 %res2, 1000000000
%sel2 = select i1 %cmp2, i32 0, i32 1
ret i32 %sel2
}
; Test large immediate comparison involving low registers.
define i32 @f32() {
; CHECK-LABEL: f32:
; CHECK: stepa [[REG1:%r[0-5]]]
; CHECK: cfi [[REG1]], 1000000000
; CHECK: stepb [[REG2:%r[0-5]]]
; CHECK: clfi [[REG2]], 1000000000
; CHECK: br %r14
%res1 = call i32 asm "stepa $0", "=r"()
%cmp1 = icmp sle i32 %res1, 1000000000
%sel1 = select i1 %cmp1, i32 0, i32 1
%res2 = call i32 asm "stepb $0, $1", "=r,r"(i32 %sel1)
%cmp2 = icmp ule i32 %res2, 1000000000
%sel2 = select i1 %cmp2, i32 0, i32 1
ret i32 %sel2
}

30
test/MC/Disassembler/SystemZ/insns.txt
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@ -1351,6 +1351,24 @@
# CHECK: chy %r15, 0
0xe3 0xf0 0x00 0x00 0x00 0x79
# CHECK: cih %r0, -2147483648
0xcc 0x0d 0x80 0x00 0x00 0x00
# CHECK: cih %r0, -1
0xcc 0x0d 0xff 0xff 0xff 0xff
# CHECK: cih %r0, 0
0xcc 0x0d 0x00 0x00 0x00 0x00
# CHECK: cih %r0, 1
0xcc 0x0d 0x00 0x00 0x00 0x01
# CHECK: cih %r0, 2147483647
0xcc 0x0d 0x7f 0xff 0xff 0xff
# CHECK: cih %r15, 0
0xcc 0xfd 0x00 0x00 0x00 0x00
# CHECK: clc 0(1), 0
0xd5 0x00 0x00 0x00 0x00 0x00
@ -1573,6 +1591,18 @@
# CHECK: cli 4095(%r15), 42
0x95 0x2a 0xff 0xff
# CHECK: clih %r0, 0
0xcc 0x0f 0x00 0x00 0x00 0x00
# CHECK: clih %r0, 1
0xcc 0x0f 0x00 0x00 0x00 0x01
# CHECK: clih %r0, 4294967295
0xcc 0x0f 0xff 0xff 0xff 0xff
# CHECK: clih %r15, 0
0xcc 0xff 0x00 0x00 0x00 0x00
# CHECK: cliy -524288, 0
0xeb 0x00 0x00 0x00 0x80 0x55

16
test/MC/SystemZ/insn-bad-z196.s
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@ -32,6 +32,22 @@
aih %r0, (-1 << 31) - 1
aih %r0, (1 << 31)
#CHECK: error: invalid operand
#CHECK: cih %r0, (-1 << 31) - 1
#CHECK: error: invalid operand
#CHECK: cih %r0, (1 << 31)
cih %r0, (-1 << 31) - 1
cih %r0, (1 << 31)
#CHECK: error: invalid operand
#CHECK: clih %r0, -1
#CHECK: error: invalid operand
#CHECK: clih %r0, (1 << 32)
clih %r0, -1
clih %r0, (1 << 32)
#CHECK: error: invalid operand
#CHECK: fidbra %f0, 0, %f0, -1
#CHECK: error: invalid operand

10
test/MC/SystemZ/insn-bad.s
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@ -679,6 +679,11 @@
chy %r0, -524289
chy %r0, 524288
#CHECK: error: {{(instruction requires: high-word)?}}
#CHECK: cih %r0, 0
cih %r0, 0
#CHECK: error: invalid operand
#CHECK: cij %r0, -129, 0, 0
#CHECK: error: invalid operand
@ -961,6 +966,11 @@
cli 0, -1
cli 0, 256
#CHECK: error: {{(instruction requires: high-word)?}}
#CHECK: clih %r0, 0
clih %r0, 0
#CHECK: error: invalid operand
#CHECK: clij %r0, -1, 0, 0
#CHECK: error: invalid operand

24
test/MC/SystemZ/insn-good-z196.s
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@ -135,6 +135,30 @@
ark %r15,%r0,%r0
ark %r7,%r8,%r9
#CHECK: cih %r0, -2147483648 # encoding: [0xcc,0x0d,0x80,0x00,0x00,0x00]
#CHECK: cih %r0, -1 # encoding: [0xcc,0x0d,0xff,0xff,0xff,0xff]
#CHECK: cih %r0, 0 # encoding: [0xcc,0x0d,0x00,0x00,0x00,0x00]
#CHECK: cih %r0, 1 # encoding: [0xcc,0x0d,0x00,0x00,0x00,0x01]
#CHECK: cih %r0, 2147483647 # encoding: [0xcc,0x0d,0x7f,0xff,0xff,0xff]
#CHECK: cih %r15, 0 # encoding: [0xcc,0xfd,0x00,0x00,0x00,0x00]
cih %r0, -1 << 31
cih %r0, -1
cih %r0, 0
cih %r0, 1
cih %r0, (1 << 31) - 1
cih %r15, 0
#CHECK: clih %r0, 0 # encoding: [0xcc,0x0f,0x00,0x00,0x00,0x00]
#CHECK: clih %r0, 1 # encoding: [0xcc,0x0f,0x00,0x00,0x00,0x01]
#CHECK: clih %r0, 4294967295 # encoding: [0xcc,0x0f,0xff,0xff,0xff,0xff]
#CHECK: clih %r15, 0 # encoding: [0xcc,0xff,0x00,0x00,0x00,0x00]
clih %r0, 0
clih %r0, 1
clih %r0, (1 << 32) - 1
clih %r15, 0
#CHECK: fidbra %f0, 0, %f0, 0 # encoding: [0xb3,0x5f,0x00,0x00]
#CHECK: fidbra %f0, 0, %f0, 15 # encoding: [0xb3,0x5f,0x0f,0x00]
#CHECK: fidbra %f0, 0, %f15, 0 # encoding: [0xb3,0x5f,0x00,0x0f]