forked from OSchip/llvm-project
65 lines
1.7 KiB
LLVM
65 lines
1.7 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
|
|
; RUN: opt < %s -instcombine -S | FileCheck %s
|
|
|
|
define i64 @test1(i32 %x) nounwind {
|
|
; CHECK-LABEL: @test1(
|
|
; CHECK-NEXT: ret i64 0
|
|
;
|
|
%y = lshr i32 %x, 1
|
|
%r = udiv i32 %y, -1
|
|
%z = sext i32 %r to i64
|
|
ret i64 %z
|
|
}
|
|
define i64 @test2(i32 %x) nounwind {
|
|
; CHECK-LABEL: @test2(
|
|
; CHECK-NEXT: ret i64 0
|
|
;
|
|
%y = lshr i32 %x, 31
|
|
%r = udiv i32 %y, 3
|
|
%z = sext i32 %r to i64
|
|
ret i64 %z
|
|
}
|
|
|
|
; The udiv instructions shouldn't be optimized away, and the
|
|
; sext instructions should be optimized to zext.
|
|
|
|
define i64 @test1_PR2274(i32 %x, i32 %g) nounwind {
|
|
; CHECK-LABEL: @test1_PR2274(
|
|
; CHECK-NEXT: [[Y:%.*]] = lshr i32 %x, 30
|
|
; CHECK-NEXT: [[R:%.*]] = udiv i32 [[Y]], %g
|
|
; CHECK-NEXT: [[Z1:%.*]] = zext i32 [[R]] to i64
|
|
; CHECK-NEXT: ret i64 [[Z1]]
|
|
;
|
|
%y = lshr i32 %x, 30
|
|
%r = udiv i32 %y, %g
|
|
%z = sext i32 %r to i64
|
|
ret i64 %z
|
|
}
|
|
define i64 @test2_PR2274(i32 %x, i32 %v) nounwind {
|
|
; CHECK-LABEL: @test2_PR2274(
|
|
; CHECK-NEXT: [[Y:%.*]] = lshr i32 %x, 31
|
|
; CHECK-NEXT: [[R:%.*]] = udiv i32 [[Y]], %v
|
|
; CHECK-NEXT: [[Z1:%.*]] = zext i32 [[R]] to i64
|
|
; CHECK-NEXT: ret i64 [[Z1]]
|
|
;
|
|
%y = lshr i32 %x, 31
|
|
%r = udiv i32 %y, %v
|
|
%z = sext i32 %r to i64
|
|
ret i64 %z
|
|
}
|
|
|
|
; The udiv should be simplified according to the rule:
|
|
; X udiv (C1 << N), where C1 is `1<<C2` --> X >> (N+C2)
|
|
@b = external global [1 x i16]
|
|
|
|
define i32 @PR30366(i1 %a) {
|
|
; CHECK-LABEL: @PR30366(
|
|
; CHECK-NEXT: [[Z:%.*]] = zext i1 %a to i32
|
|
; CHECK-NEXT: [[D:%.*]] = lshr i32 [[Z]], zext (i16 ptrtoint ([1 x i16]* @b to i16) to i32)
|
|
; CHECK-NEXT: ret i32 [[D]]
|
|
;
|
|
%z = zext i1 %a to i32
|
|
%d = udiv i32 %z, zext (i16 shl (i16 1, i16 ptrtoint ([1 x i16]* @b to i16)) to i32)
|
|
ret i32 %d
|
|
}
|