[PATCH] D15277: [ARMv8-M] [4/9] Add SDIV/UDIV instructions to ARMv8-M Baseline

[Bradley Smith via llvm-commits]

bsmith updated this revision to Diff 42154.
bsmith added a comment.

Rebase onto changes done in http://reviews.llvm.org/D15275.


Repository:
  rL LLVM

http://reviews.llvm.org/D15277

Files:
  lib/Target/ARM/ARMISelLowering.cpp
  lib/Target/ARM/ARMInstrThumb2.td
  test/MC/ARM/thumbv8m.s

Index: test/MC/ARM/thumbv8m.s
===================================================================
--- test/MC/ARM/thumbv8m.s
+++ test/MC/ARM/thumbv8m.s
@@ -21,6 +21,14 @@
 // CHECK: isb	sy              @ encoding: [0xbf,0xf3,0x6f,0x8f]
 isb sy
 
+// 'Code optimization'
+
+// CHECK: sdiv r1, r2, r3     @ encoding: [0x92,0xfb,0xf3,0xf1]
+sdiv r1, r2, r3
+
+// CHECK: udiv r1, r2, r3     @ encoding: [0xb2,0xfb,0xf3,0xf1]
+udiv r1, r2, r3
+
 // 'XO generation'
 
 // CHECK: movw r1, #65535            @ encoding: [0x4f,0xf6,0xff,0x71]
Index: lib/Target/ARM/ARMInstrThumb2.td
===================================================================
--- lib/Target/ARM/ARMInstrThumb2.td
+++ lib/Target/ARM/ARMInstrThumb2.td
@@ -2926,7 +2926,7 @@
 def t2SDIV : T2ThreeReg<(outs rGPR:$Rd), (ins rGPR:$Rn, rGPR:$Rm), IIC_iDIV,
                  "sdiv", "\t$Rd, $Rn, $Rm",
                  [(set rGPR:$Rd, (sdiv rGPR:$Rn, rGPR:$Rm))]>,
-                 Requires<[HasDivide, IsThumb2]> {
+                 Requires<[HasDivide, IsThumb, HasV8MBaseline]> {
   let Inst{31-27} = 0b11111;
   let Inst{26-21} = 0b011100;
   let Inst{20} = 0b1;
@@ -2937,7 +2937,7 @@
 def t2UDIV : T2ThreeReg<(outs rGPR:$Rd), (ins rGPR:$Rn, rGPR:$Rm), IIC_iDIV,
                  "udiv", "\t$Rd, $Rn, $Rm",
                  [(set rGPR:$Rd, (udiv rGPR:$Rn, rGPR:$Rm))]>,
-                 Requires<[HasDivide, IsThumb2]> {
+                 Requires<[HasDivide, IsThumb, HasV8MBaseline]> {
   let Inst{31-27} = 0b11111;
   let Inst{26-21} = 0b011101;
   let Inst{20} = 0b1;
Index: lib/Target/ARM/ARMISelLowering.cpp
===================================================================
--- lib/Target/ARM/ARMISelLowering.cpp
+++ lib/Target/ARM/ARMISelLowering.cpp
@@ -778,8 +778,9 @@
   if (!Subtarget->hasV6Ops())
     setOperationAction(ISD::BSWAP, MVT::i32, Expand);
 
-  if (!(Subtarget->hasDivide() && Subtarget->isThumb2()) &&
-      !(Subtarget->hasDivideInARMMode() && !Subtarget->isThumb())) {
+  bool hasDivide = Subtarget->isThumb() ? Subtarget->hasDivide()
+                                        : Subtarget->hasDivideInARMMode();
+  if (!hasDivide) {
     // These are expanded into libcalls if the cpu doesn't have HW divider.
     setOperationAction(ISD::SDIV,  MVT::i32, LibCall);
     setOperationAction(ISD::UDIV,  MVT::i32, LibCall);


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