llvm-project/llvm/test/Transforms/InstCombine/icmp-div-constant.ll

94 lines
2.5 KiB
LLVM

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -S | FileCheck %s
; PR30281 - https://llvm.org/bugs/show_bug.cgi?id=30281
; All of these tests contain foldable division-by-constant instructions, but we
; can't assert that those folds have occurred before we process the later icmp.
define i32 @icmp_div(i16 %a, i16 %c) {
; CHECK-LABEL: @icmp_div(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i16 %a, 0
; CHECK-NEXT: br i1 [[TOBOOL]], label %then, label %exit
; CHECK: then:
; CHECK-NEXT: [[NOT_CMP:%.*]] = icmp eq i16 %c, 0
; CHECK-NEXT: [[PHITMP1:%.*]] = sext i1 [[NOT_CMP]] to i32
; CHECK-NEXT: br label %exit
; CHECK: exit:
; CHECK-NEXT: [[PHI:%.*]] = phi i32 [ -1, %entry ], [ [[PHITMP1]], %then ]
; CHECK-NEXT: ret i32 [[PHI]]
;
entry:
%tobool = icmp eq i16 %a, 0
br i1 %tobool, label %then, label %exit
then:
%div = sdiv i16 %c, -1
%cmp = icmp ne i16 %div, 0
br label %exit
exit:
%phi = phi i1 [ false, %entry ], [ %cmp, %then ]
%zext = zext i1 %phi to i32
%add = add nsw i32 %zext, -1
ret i32 %add
}
define i32 @icmp_div2(i16 %a, i16 %c) {
; CHECK-LABEL: @icmp_div2(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i16 %a, 0
; CHECK-NEXT: br i1 [[TOBOOL]], label %then, label %exit
; CHECK: then:
; CHECK-NEXT: br label %exit
; CHECK: exit:
; CHECK-NEXT: [[PHI:%.*]] = phi i32 [ -1, %entry ], [ 0, %then ]
; CHECK-NEXT: ret i32 [[PHI]]
;
entry:
%tobool = icmp eq i16 %a, 0
br i1 %tobool, label %then, label %exit
then:
%div = sdiv i16 %c, 0
%cmp = icmp ne i16 %div, 0
br label %exit
exit:
%phi = phi i1 [ false, %entry ], [ %cmp, %then ]
%zext = zext i1 %phi to i32
%add = add nsw i32 %zext, -1
ret i32 %add
}
define i32 @icmp_div3(i16 %a, i16 %c) {
; CHECK-LABEL: @icmp_div3(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i16 %a, 0
; CHECK-NEXT: br i1 [[TOBOOL]], label %then, label %exit
; CHECK: then:
; CHECK-NEXT: [[NOT_CMP:%.*]] = icmp eq i16 %c, 0
; CHECK-NEXT: [[PHITMP1:%.*]] = sext i1 [[NOT_CMP]] to i32
; CHECK-NEXT: br label %exit
; CHECK: exit:
; CHECK-NEXT: [[PHI:%.*]] = phi i32 [ -1, %entry ], [ [[PHITMP1]], %then ]
; CHECK-NEXT: ret i32 [[PHI]]
;
entry:
%tobool = icmp eq i16 %a, 0
br i1 %tobool, label %then, label %exit
then:
%div = sdiv i16 %c, 1
%cmp = icmp ne i16 %div, 0
br label %exit
exit:
%phi = phi i1 [ false, %entry ], [ %cmp, %then ]
%zext = zext i1 %phi to i32
%add = add nsw i32 %zext, -1
ret i32 %add
}