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[AVR] Lower i128 divisions to runtime library calls

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This patch adds i128 division support by instruction LLVM to lower
128-bit divisions to the __udivmodti4 and __divmodti4 rtlib functions.

This also adds test for 64-bit division and 128-bit division.

Patch by Peter Nimmervoll.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@327814 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dylan McKay
2018-03-19 00:55:50 +00:00
parent 258e9b1964
commit f0c8edc1fc
2 changed files with 55 additions and 0 deletions
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lib/Target/AVR/AVRISelLowering.cpp
+3
View File
@@ -345,6 +345,9 @@ SDValue AVRTargetLowering::LowerDivRem(SDValue Op, SelectionDAG &DAG) const {
case MVT::i64:
LC = IsSigned ? RTLIB::SDIVREM_I64 : RTLIB::UDIVREM_I64;
break;
case MVT::i128:
LC = IsSigned ? RTLIB::SDIVREM_I128 : RTLIB::UDIVREM_I128;
break;
}
SDValue InChain = DAG.getEntryNode();
test/CodeGen/AVR/div.ll
+52
View File
@@ -62,3 +62,55 @@ define i32 @sdiv32(i32 %a, i32 %b) {
ret i32 %quot
}
; Unsigned 64-bit division
define i64 @udiv64(i64 %a, i64 %b) {
; CHECK-LABEL: udiv64:
; CHECK: call __udivmoddi4
; CHECK-NEXT: ldd r18, Y+1
; CHECK-NEXT: ldd r19, Y+2
; CHECK-NEXT: ldd r20, Y+3
; CHECK-NEXT: ldd r21, Y+4
; CHECK-NEXT: ldd r22, Y+5
; CHECK-NEXT: ldd r23, Y+6
; CHECK-NEXT: ldd r24, Y+7
; CHECK-NEXT: ldd r25, Y+8
; CHECK: ret
%quot = udiv i64 %a, %b
ret i64 %quot
}
; Signed 64-bit division
define i64 @sdiv64(i64 %a, i64 %b) {
; CHECK-LABEL: sdiv64:
; CHECK: call __divmoddi4
; CHECK-NEXT: ldd r18, Y+1
; CHECK-NEXT: ldd r19, Y+2
; CHECK-NEXT: ldd r20, Y+3
; CHECK-NEXT: ldd r21, Y+4
; CHECK-NEXT: ldd r22, Y+5
; CHECK-NEXT: ldd r23, Y+6
; CHECK-NEXT: ldd r24, Y+7
; CHECK-NEXT: ldd r25, Y+8
; CHECK: ret
%quot = sdiv i64 %a, %b
ret i64 %quot
}
; Unsigned 128-bit division
define i128 @udiv128(i128 %a, i128 %b) {
; CHECK-LABEL: udiv128:
; CHECK: call __udivmodti4
; CHECK: ret
%quot = udiv i128 %a, %b
ret i128 %quot
}
; Signed 128-bit division
define i128 @sdiv128(i128 %a, i128 %b) {
; CHECK-LABEL: sdiv128:
; CHECK: call __divmodti4
; CHECK: ret
%quot = sdiv i128 %a, %b
ret i128 %quot
}