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-rw-r--r--lib/Target/X86/X86InstrInfo.cpp45
-rw-r--r--lib/Target/X86/X86InstrInfo.td7
-rw-r--r--lib/Target/X86/X86InstrSSE.td4
-rw-r--r--lib/Target/X86/X86RegisterInfo.cpp66
-rw-r--r--lib/Target/X86/X86RegisterInfo.td105
-rw-r--r--test/CodeGen/X86/coalesce-esp.ll36
6 files changed, 225 insertions, 38 deletions
diff --git a/lib/Target/X86/X86InstrInfo.cpp b/lib/Target/X86/X86InstrInfo.cpp
index 4b29305086..afdb0f0f77 100644
--- a/lib/Target/X86/X86InstrInfo.cpp
+++ b/lib/Target/X86/X86InstrInfo.cpp
@@ -1695,14 +1695,22 @@ bool X86InstrInfo::copyRegToReg(MachineBasicBlock &MBB,
/* Source and destination have the same register class. */;
else if (CommonRC->hasSuperClass(SrcRC))
CommonRC = SrcRC;
- else if (!DestRC->hasSubClass(SrcRC))
- CommonRC = 0;
+ else if (!DestRC->hasSubClass(SrcRC)) {
+ // Neither of GR64_NOREX or GR64_NOSP is a superclass of the other,
+ // but we want to copy then as GR64.
+ if (SrcRC->hasSuperClass(&X86::GR64RegClass) &&
+ DestRC->hasSuperClass(&X86::GR64RegClass))
+ CommonRC = &X86::GR64RegClass;
+ else
+ CommonRC = 0;
+ }
if (CommonRC) {
unsigned Opc;
- if (CommonRC == &X86::GR64RegClass) {
+ if (CommonRC == &X86::GR64RegClass || CommonRC == &X86::GR64_NOSPRegClass) {
Opc = X86::MOV64rr;
- } else if (CommonRC == &X86::GR32RegClass) {
+ } else if (CommonRC == &X86::GR32RegClass ||
+ CommonRC == &X86::GR32_NOSPRegClass) {
Opc = X86::MOV32rr;
} else if (CommonRC == &X86::GR16RegClass) {
Opc = X86::MOV16rr;
@@ -1727,7 +1735,8 @@ bool X86InstrInfo::copyRegToReg(MachineBasicBlock &MBB,
Opc = X86::MOV8rr_NOREX;
else
Opc = X86::MOV8rr;
- } else if (CommonRC == &X86::GR64_NOREXRegClass) {
+ } else if (CommonRC == &X86::GR64_NOREXRegClass ||
+ CommonRC == &X86::GR64_NOREX_NOSPRegClass) {
Opc = X86::MOV64rr;
} else if (CommonRC == &X86::GR32_NOREXRegClass) {
Opc = X86::MOV32rr;
@@ -1755,16 +1764,17 @@ bool X86InstrInfo::copyRegToReg(MachineBasicBlock &MBB,
BuildMI(MBB, MI, DL, get(Opc), DestReg).addReg(SrcReg);
return true;
}
-
+
// Moving EFLAGS to / from another register requires a push and a pop.
if (SrcRC == &X86::CCRRegClass) {
if (SrcReg != X86::EFLAGS)
return false;
- if (DestRC == &X86::GR64RegClass) {
+ if (DestRC == &X86::GR64RegClass || DestRC == &X86::GR64_NOSPRegClass) {
BuildMI(MBB, MI, DL, get(X86::PUSHFQ));
BuildMI(MBB, MI, DL, get(X86::POP64r), DestReg);
return true;
- } else if (DestRC == &X86::GR32RegClass) {
+ } else if (DestRC == &X86::GR32RegClass ||
+ DestRC == &X86::GR32_NOSPRegClass) {
BuildMI(MBB, MI, DL, get(X86::PUSHFD));
BuildMI(MBB, MI, DL, get(X86::POP32r), DestReg);
return true;
@@ -1772,11 +1782,12 @@ bool X86InstrInfo::copyRegToReg(MachineBasicBlock &MBB,
} else if (DestRC == &X86::CCRRegClass) {
if (DestReg != X86::EFLAGS)
return false;
- if (SrcRC == &X86::GR64RegClass) {
+ if (SrcRC == &X86::GR64RegClass || DestRC == &X86::GR64_NOSPRegClass) {
BuildMI(MBB, MI, DL, get(X86::PUSH64r)).addReg(SrcReg);
BuildMI(MBB, MI, DL, get(X86::POPFQ));
return true;
- } else if (SrcRC == &X86::GR32RegClass) {
+ } else if (SrcRC == &X86::GR32RegClass ||
+ DestRC == &X86::GR32_NOSPRegClass) {
BuildMI(MBB, MI, DL, get(X86::PUSH32r)).addReg(SrcReg);
BuildMI(MBB, MI, DL, get(X86::POPFD));
return true;
@@ -1834,9 +1845,9 @@ static unsigned getStoreRegOpcode(unsigned SrcReg,
bool isStackAligned,
TargetMachine &TM) {
unsigned Opc = 0;
- if (RC == &X86::GR64RegClass) {
+ if (RC == &X86::GR64RegClass || RC == &X86::GR64_NOSPRegClass) {
Opc = X86::MOV64mr;
- } else if (RC == &X86::GR32RegClass) {
+ } else if (RC == &X86::GR32RegClass || RC == &X86::GR32_NOSPRegClass) {
Opc = X86::MOV32mr;
} else if (RC == &X86::GR16RegClass) {
Opc = X86::MOV16mr;
@@ -1861,7 +1872,8 @@ static unsigned getStoreRegOpcode(unsigned SrcReg,
Opc = X86::MOV8mr_NOREX;
else
Opc = X86::MOV8mr;
- } else if (RC == &X86::GR64_NOREXRegClass) {
+ } else if (RC == &X86::GR64_NOREXRegClass ||
+ RC == &X86::GR64_NOREX_NOSPRegClass) {
Opc = X86::MOV64mr;
} else if (RC == &X86::GR32_NOREXRegClass) {
Opc = X86::MOV32mr;
@@ -1926,9 +1938,9 @@ static unsigned getLoadRegOpcode(unsigned DestReg,
bool isStackAligned,
const TargetMachine &TM) {
unsigned Opc = 0;
- if (RC == &X86::GR64RegClass) {
+ if (RC == &X86::GR64RegClass || RC == &X86::GR64_NOSPRegClass) {
Opc = X86::MOV64rm;
- } else if (RC == &X86::GR32RegClass) {
+ } else if (RC == &X86::GR32RegClass || RC == &X86::GR32_NOSPRegClass) {
Opc = X86::MOV32rm;
} else if (RC == &X86::GR16RegClass) {
Opc = X86::MOV16rm;
@@ -1953,7 +1965,8 @@ static unsigned getLoadRegOpcode(unsigned DestReg,
Opc = X86::MOV8rm_NOREX;
else
Opc = X86::MOV8rm;
- } else if (RC == &X86::GR64_NOREXRegClass) {
+ } else if (RC == &X86::GR64_NOREXRegClass ||
+ RC == &X86::GR64_NOREX_NOSPRegClass) {
Opc = X86::MOV64rm;
} else if (RC == &X86::GR32_NOREXRegClass) {
Opc = X86::MOV32rm;
diff --git a/lib/Target/X86/X86InstrInfo.td b/lib/Target/X86/X86InstrInfo.td
index 0e40965a4c..c547c76ec1 100644
--- a/lib/Target/X86/X86InstrInfo.td
+++ b/lib/Target/X86/X86InstrInfo.td
@@ -167,12 +167,15 @@ def i32imm_pcrel : Operand<i32> {
let PrintMethod = "print_pcrel_imm";
}
+// A version of ptr_rc which excludes SP, ESP, and RSP. This is used for
+// the index operand of an address, to conform to x86 encoding restrictions.
+def ptr_rc_nosp : PointerLikeRegClass<1>;
// *mem - Operand definitions for the funky X86 addressing mode operands.
//
class X86MemOperand<string printMethod> : Operand<iPTR> {
let PrintMethod = printMethod;
- let MIOperandInfo = (ops ptr_rc, i8imm, ptr_rc, i32imm, i8imm);
+ let MIOperandInfo = (ops ptr_rc, i8imm, ptr_rc_nosp, i32imm, i8imm);
}
def i8mem : X86MemOperand<"printi8mem">;
@@ -191,7 +194,7 @@ def f256mem : X86MemOperand<"printf256mem">;
// plain GR64, so that it doesn't potentially require a REX prefix.
def i8mem_NOREX : Operand<i64> {
let PrintMethod = "printi8mem";
- let MIOperandInfo = (ops GR64_NOREX, i8imm, GR64_NOREX, i32imm, i8imm);
+ let MIOperandInfo = (ops GR64_NOREX, i8imm, GR64_NOREX_NOSP, i32imm, i8imm);
}
def lea32mem : Operand<i32> {
diff --git a/lib/Target/X86/X86InstrSSE.td b/lib/Target/X86/X86InstrSSE.td
index 853f88ed19..2440aecf5f 100644
--- a/lib/Target/X86/X86InstrSSE.td
+++ b/lib/Target/X86/X86InstrSSE.td
@@ -86,11 +86,11 @@ def sse_load_f64 : ComplexPattern<v2f64, 5, "SelectScalarSSELoad", [],
def ssmem : Operand<v4f32> {
let PrintMethod = "printf32mem";
- let MIOperandInfo = (ops ptr_rc, i8imm, ptr_rc, i32imm, i8imm);
+ let MIOperandInfo = (ops ptr_rc, i8imm, ptr_rc_nosp, i32imm, i8imm);
}
def sdmem : Operand<v2f64> {
let PrintMethod = "printf64mem";
- let MIOperandInfo = (ops ptr_rc, i8imm, ptr_rc, i32imm, i8imm);
+ let MIOperandInfo = (ops ptr_rc, i8imm, ptr_rc_nosp, i32imm, i8imm);
}
//===----------------------------------------------------------------------===//
diff --git a/lib/Target/X86/X86RegisterInfo.cpp b/lib/Target/X86/X86RegisterInfo.cpp
index e5d563c9ad..864e33b224 100644
--- a/lib/Target/X86/X86RegisterInfo.cpp
+++ b/lib/Target/X86/X86RegisterInfo.cpp
@@ -37,10 +37,16 @@
#include "llvm/Target/TargetOptions.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/STLExtras.h"
+#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/ErrorHandling.h"
using namespace llvm;
+static cl::opt<bool>
+StrictIndexRegclass("strict-index-regclass",
+ cl::desc("Use a special register class to avoid letting SP "
+ "be used as an index"));
+
X86RegisterInfo::X86RegisterInfo(X86TargetMachine &tm,
const TargetInstrInfo &tii)
: X86GenRegisterInfo(tm.getSubtarget<X86Subtarget>().is64Bit() ?
@@ -165,20 +171,25 @@ X86RegisterInfo::getMatchingSuperRegClass(const TargetRegisterClass *A,
return A;
} else if (B == &X86::GR8_ABCD_LRegClass || B == &X86::GR8_ABCD_HRegClass) {
if (A == &X86::GR64RegClass || A == &X86::GR64_ABCDRegClass ||
- A == &X86::GR64_NOREXRegClass)
+ A == &X86::GR64_NOREXRegClass ||
+ A == &X86::GR64_NOSPRegClass ||
+ A == &X86::GR64_NOREX_NOSPRegClass)
return &X86::GR64_ABCDRegClass;
else if (A == &X86::GR32RegClass || A == &X86::GR32_ABCDRegClass ||
- A == &X86::GR32_NOREXRegClass)
+ A == &X86::GR32_NOREXRegClass ||
+ A == &X86::GR32_NOSPRegClass)
return &X86::GR32_ABCDRegClass;
else if (A == &X86::GR16RegClass || A == &X86::GR16_ABCDRegClass ||
A == &X86::GR16_NOREXRegClass)
return &X86::GR16_ABCDRegClass;
} else if (B == &X86::GR8_NOREXRegClass) {
- if (A == &X86::GR64RegClass || A == &X86::GR64_NOREXRegClass)
+ if (A == &X86::GR64RegClass || A == &X86::GR64_NOREXRegClass ||
+ A == &X86::GR64_NOSPRegClass || A == &X86::GR64_NOREX_NOSPRegClass)
return &X86::GR64_NOREXRegClass;
else if (A == &X86::GR64_ABCDRegClass)
return &X86::GR64_ABCDRegClass;
- else if (A == &X86::GR32RegClass || A == &X86::GR32_NOREXRegClass)
+ else if (A == &X86::GR32RegClass || A == &X86::GR32_NOREXRegClass ||
+ A == &X86::GR32_NOSPRegClass)
return &X86::GR32_NOREXRegClass;
else if (A == &X86::GR32_ABCDRegClass)
return &X86::GR32_ABCDRegClass;
@@ -192,10 +203,12 @@ X86RegisterInfo::getMatchingSuperRegClass(const TargetRegisterClass *A,
// 8-bit hi
if (B == &X86::GR8_ABCD_HRegClass) {
if (A == &X86::GR64RegClass || A == &X86::GR64_ABCDRegClass ||
- A == &X86::GR64_NOREXRegClass)
+ A == &X86::GR64_NOREXRegClass ||
+ A == &X86::GR64_NOSPRegClass ||
+ A == &X86::GR64_NOREX_NOSPRegClass)
return &X86::GR64_ABCDRegClass;
else if (A == &X86::GR32RegClass || A == &X86::GR32_ABCDRegClass ||
- A == &X86::GR32_NOREXRegClass)
+ A == &X86::GR32_NOREXRegClass || A == &X86::GR32_NOSPRegClass)
return &X86::GR32_ABCDRegClass;
else if (A == &X86::GR16RegClass || A == &X86::GR16_ABCDRegClass ||
A == &X86::GR16_NOREXRegClass)
@@ -209,17 +222,21 @@ X86RegisterInfo::getMatchingSuperRegClass(const TargetRegisterClass *A,
return A;
} else if (B == &X86::GR16_ABCDRegClass) {
if (A == &X86::GR64RegClass || A == &X86::GR64_ABCDRegClass ||
- A == &X86::GR64_NOREXRegClass)
+ A == &X86::GR64_NOREXRegClass ||
+ A == &X86::GR64_NOSPRegClass ||
+ A == &X86::GR64_NOREX_NOSPRegClass)
return &X86::GR64_ABCDRegClass;
else if (A == &X86::GR32RegClass || A == &X86::GR32_ABCDRegClass ||
- A == &X86::GR32_NOREXRegClass)
+ A == &X86::GR32_NOREXRegClass || A == &X86::GR32_NOSPRegClass)
return &X86::GR32_ABCDRegClass;
} else if (B == &X86::GR16_NOREXRegClass) {
- if (A == &X86::GR64RegClass || A == &X86::GR64_NOREXRegClass)
+ if (A == &X86::GR64RegClass || A == &X86::GR64_NOREXRegClass ||
+ A == &X86::GR64_NOSPRegClass || A == &X86::GR64_NOREX_NOSPRegClass)
return &X86::GR64_NOREXRegClass;
else if (A == &X86::GR64_ABCDRegClass)
return &X86::GR64_ABCDRegClass;
- else if (A == &X86::GR32RegClass || A == &X86::GR32_NOREXRegClass)
+ else if (A == &X86::GR32RegClass || A == &X86::GR32_NOREXRegClass ||
+ A == &X86::GR32_NOSPRegClass)
return &X86::GR32_NOREXRegClass;
else if (A == &X86::GR32_ABCDRegClass)
return &X86::GR64_ABCDRegClass;
@@ -227,15 +244,18 @@ X86RegisterInfo::getMatchingSuperRegClass(const TargetRegisterClass *A,
break;
case 4:
// 32-bit
- if (B == &X86::GR32RegClass) {
+ if (B == &X86::GR32RegClass || B == &X86::GR32_NOSPRegClass) {
if (A->getSize() == 8)
return A;
} else if (B == &X86::GR32_ABCDRegClass) {
if (A == &X86::GR64RegClass || A == &X86::GR64_ABCDRegClass ||
- A == &X86::GR64_NOREXRegClass)
+ A == &X86::GR64_NOREXRegClass ||
+ A == &X86::GR64_NOSPRegClass ||
+ A == &X86::GR64_NOREX_NOSPRegClass)
return &X86::GR64_ABCDRegClass;
} else if (B == &X86::GR32_NOREXRegClass) {
- if (A == &X86::GR64RegClass || A == &X86::GR64_NOREXRegClass)
+ if (A == &X86::GR64RegClass || A == &X86::GR64_NOREXRegClass ||
+ A == &X86::GR64_NOSPRegClass || A == &X86::GR64_NOREX_NOSPRegClass)
return &X86::GR64_NOREXRegClass;
else if (A == &X86::GR64_ABCDRegClass)
return &X86::GR64_ABCDRegClass;
@@ -247,9 +267,23 @@ X86RegisterInfo::getMatchingSuperRegClass(const TargetRegisterClass *A,
const TargetRegisterClass *X86RegisterInfo::
getPointerRegClass(unsigned Kind) const {
- if (TM.getSubtarget<X86Subtarget>().is64Bit())
- return &X86::GR64RegClass;
- return &X86::GR32RegClass;
+ switch (Kind) {
+ default: llvm_unreachable("Unexpected Kind in getPointerRegClass!");
+ case 0: // Normal GPRs.
+ if (TM.getSubtarget<X86Subtarget>().is64Bit())
+ return &X86::GR64RegClass;
+ return &X86::GR32RegClass;
+ case 1: // Normal GRPs except the stack pointer (for encoding reasons).
+ if (!StrictIndexRegclass) {
+ if (TM.getSubtarget<X86Subtarget>().is64Bit())
+ return &X86::GR64RegClass;
+ return &X86::GR32RegClass;
+ } else {
+ if (TM.getSubtarget<X86Subtarget>().is64Bit())
+ return &X86::GR64_NOSPRegClass;
+ return &X86::GR32_NOSPRegClass;
+ }
+ }
}
const TargetRegisterClass *
diff --git a/lib/Target/X86/X86RegisterInfo.td b/lib/Target/X86/X86RegisterInfo.td
index bfffee7b72..d2197b2415 100644
--- a/lib/Target/X86/X86RegisterInfo.td
+++ b/lib/Target/X86/X86RegisterInfo.td
@@ -416,7 +416,9 @@ def GR32 : RegisterClass<"X86", [i32], 32,
}];
}
-
+// GR64 - 64-bit GPRs. This oddly includes RIP, which isn't accurate, since
+// RIP isn't really a register and it can't be used anywhere except in an
+// address, but it doesn't cause trouble.
def GR64 : RegisterClass<"X86", [i64], 64,
[RAX, RCX, RDX, RSI, RDI, R8, R9, R10, R11,
RBX, R14, R15, R12, R13, RBP, RSP, RIP]> {
@@ -561,7 +563,7 @@ def GR64_NOREX : RegisterClass<"X86", [i64], 64,
GR64_NOREXClass::allocation_order_end(const MachineFunction &MF) const {
const TargetMachine &TM = MF.getTarget();
const TargetRegisterInfo *RI = TM.getRegisterInfo();
- // Does the function dedicate RBP / EBP to being a frame ptr?
+ // Does the function dedicate RBP to being a frame ptr?
if (RI->hasFP(MF))
// If so, don't allocate RSP or RBP.
return end() - 2;
@@ -572,6 +574,105 @@ def GR64_NOREX : RegisterClass<"X86", [i64], 64,
}];
}
+// GR32_NOSP - GR32 registers except ESP.
+def GR32_NOSP : RegisterClass<"X86", [i32], 32,
+ [EAX, ECX, EDX, ESI, EDI, EBX, EBP,
+ R8D, R9D, R10D, R11D, R14D, R15D, R12D, R13D]> {
+ let SubRegClassList = [GR8, GR8, GR16];
+ let MethodProtos = [{
+ iterator allocation_order_begin(const MachineFunction &MF) const;
+ iterator allocation_order_end(const MachineFunction &MF) const;
+ }];
+ let MethodBodies = [{
+ static const unsigned X86_GR32_NOSP_AO_64[] = {
+ X86::EAX, X86::ECX, X86::EDX, X86::ESI, X86::EDI,
+ X86::R8D, X86::R9D, X86::R10D, X86::R11D,
+ X86::EBX, X86::R14D, X86::R15D, X86::R12D, X86::R13D, X86::EBP
+ };
+
+ GR32_NOSPClass::iterator
+ GR32_NOSPClass::allocation_order_begin(const MachineFunction &MF) const {
+ const TargetMachine &TM = MF.getTarget();
+ const X86Subtarget &Subtarget = TM.getSubtarget<X86Subtarget>();
+ if (Subtarget.is64Bit())
+ return X86_GR32_NOSP_AO_64;
+ else
+ return begin();
+ }
+
+ GR32_NOSPClass::iterator
+ GR32_NOSPClass::allocation_order_end(const MachineFunction &MF) const {
+ const TargetMachine &TM = MF.getTarget();
+ const TargetRegisterInfo *RI = TM.getRegisterInfo();
+ const X86Subtarget &Subtarget = TM.getSubtarget<X86Subtarget>();
+ if (Subtarget.is64Bit()) {
+ // Does the function dedicate RBP to being a frame ptr?
+ if (RI->hasFP(MF))
+ // If so, don't allocate EBP.
+ return array_endof(X86_GR32_NOSP_AO_64) - 1;
+ else
+ // If not, any reg in this class is ok.
+ return array_endof(X86_GR32_NOSP_AO_64);
+ } else {
+ // Does the function dedicate EBP to being a frame ptr?
+ if (RI->hasFP(MF))
+ // If so, don't allocate EBP.
+ return begin() + 6;
+ else
+ // If not, any reg in this class is ok.
+ return begin() + 7;
+ }
+ }
+ }];
+}
+
+// GR64_NOSP - GR64 registers except RSP (and RIP).
+def GR64_NOSP : RegisterClass<"X86", [i64], 64,
+ [RAX, RCX, RDX, RSI, RDI, R8, R9, R10, R11,
+ RBX, R14, R15, R12, R13, RBP]> {
+ let SubRegClassList = [GR8, GR8, GR16, GR32_NOSP];
+ let MethodProtos = [{
+ iterator allocation_order_end(const MachineFunction &MF) const;
+ }];
+ let MethodBodies = [{
+ GR64_NOSPClass::iterator
+ GR64_NOSPClass::allocation_order_end(const MachineFunction &MF) const {
+ const TargetMachine &TM = MF.getTarget();
+ const TargetRegisterInfo *RI = TM.getRegisterInfo();
+ const X86Subtarget &Subtarget = TM.getSubtarget<X86Subtarget>();
+ if (!Subtarget.is64Bit())
+ return begin(); // None of these are allocatable in 32-bit.
+ if (RI->hasFP(MF)) // Does the function dedicate RBP to being a frame ptr?
+ return end()-1; // If so, don't allocate RBP
+ else
+ return end(); // If not, any reg in this class is ok.
+ }
+ }];
+}
+
+// GR64_NOREX_NOSP - GR64_NOREX registers except RSP.
+def GR64_NOREX_NOSP : RegisterClass<"X86", [i64], 64,
+ [RAX, RCX, RDX, RSI, RDI, RBX, RBP]> {
+ let SubRegClassList = [GR8_NOREX, GR8_NOREX, GR16_NOREX, GR32_NOREX];
+ let MethodProtos = [{
+ iterator allocation_order_end(const MachineFunction &MF) const;
+ }];
+ let MethodBodies = [{
+ GR64_NOREX_NOSPClass::iterator
+ GR64_NOREX_NOSPClass::allocation_order_end(const MachineFunction &MF) const {
+ const TargetMachine &TM = MF.getTarget();
+ const TargetRegisterInfo *RI = TM.getRegisterInfo();
+ // Does the function dedicate RBP to being a frame ptr?
+ if (RI->hasFP(MF))
+ // If so, don't allocate RBP.
+ return end() - 1;
+ else
+ // If not, any reg in this class is ok.
+ return end();
+ }
+ }];
+}
+
// A class to support the 'A' assembler constraint: EAX then EDX.
def GRAD : RegisterClass<"X86", [i32], 32, [EAX, EDX]>;
diff --git a/test/CodeGen/X86/coalesce-esp.ll b/test/CodeGen/X86/coalesce-esp.ll
new file mode 100644
index 0000000000..8a1597870d
--- /dev/null
+++ b/test/CodeGen/X86/coalesce-esp.ll
@@ -0,0 +1,36 @@
+; RUN: llvm-as < %s | llc -strict-index-regclass | grep {movl %esp, %eax}
+; PR4572
+
+; Don't coalesce with %esp if it would end up putting %esp in
+; the index position of an address, because that can't be
+; encoded on x86. It would actually be slightly better to
+; swap the address operands though, since there's no scale.
+
+target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:32:32"
+target triple = "i386-pc-mingw32"
+ %"struct.std::valarray<unsigned int>" = type { i32, i32* }
+
+define void @_ZSt17__gslice_to_indexjRKSt8valarrayIjES2_RS0_(i32 %__o, %"struct.std::valarray<unsigned int>"* nocapture %__l, %"struct.std::valarray<unsigned int>"* nocapture %__s, %"struct.std::valarray<unsigned int>"* nocapture %__i) nounwind {
+entry:
+ %0 = alloca i32, i32 undef, align 4 ; <i32*> [#uses=1]
+ br i1 undef, label %return, label %bb4
+
+bb4: ; preds = %bb7.backedge, %entry
+ %indvar = phi i32 [ %indvar.next, %bb7.backedge ], [ 0, %entry ] ; <i32> [#uses=2]
+ %scevgep24.sum = sub i32 undef, %indvar ; <i32> [#uses=2]
+ %scevgep25 = getelementptr i32* %0, i32 %scevgep24.sum ; <i32*> [#uses=1]
+ %scevgep27 = getelementptr i32* undef, i32 %scevgep24.sum ; <i32*> [#uses=1]
+ %1 = load i32* %scevgep27, align 4 ; <i32> [#uses=0]
+ br i1 undef, label %bb7.backedge, label %bb5
+
+bb5: ; preds = %bb4
+ store i32 0, i32* %scevgep25, align 4
+ br label %bb7.backedge
+
+bb7.backedge: ; preds = %bb5, %bb4
+ %indvar.next = add i32 %indvar, 1 ; <i32> [#uses=1]
+ br label %bb4
+
+return: ; preds = %entry
+ ret void
+}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-09-23 23:08:57 +0000