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TheRock/compiler/amd-llvm/llvm/test/CodeGen/SystemZ/int-uadd-multiple-carry-users.ll
derek.holloway 7502bf64a4
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2026-09-02 16:34:47 -07:00

24 lines
752 B
LLVM

; RUN: llc < %s -mtriple=s390x-linux-gnu -start-after=codegenprepare | FileCheck %s
;
; Test that compilation succeeds with multiple users of the carry resulting
; in a truncation of the SELECT_CCMASK used by GET_CCMASK.
define void @fun() {
; CHECK-LABEL: fun:
bb:
%0 = call { i64, i1 } @llvm.uadd.with.overflow.i64(i64 poison, i64 poison)
%ov = extractvalue { i64, i1 } %0, 1
%i2 = sext i1 %ov to i64
%i3 = select i1 %ov, i64 9223372036854775807, i64 -1
%i4 = sub nsw i64 %i3, %i2
%i5 = and i64 %i4, %i2
%i6 = icmp slt i64 %i5, 0
%i7 = xor i1 %ov, true
%i8 = select i1 %i6, i1 %i7, i1 false
%i9 = sext i1 %i8 to i16
store i16 %i9, ptr poison, align 2
unreachable
}
declare { i64, i1 } @llvm.uadd.with.overflow.i64(i64, i64)