/
aext-to-sext.ll
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/
aext-to-sext.ll
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -mtriple=riscv64 -verify-machineinstrs < %s \
; RUN: | FileCheck %s -check-prefix=RV64I
; Make sure we don't generate an addi in the loop in
; addition to the addiw. Previously we type legalize the
; setcc use using signext and the phi use using anyext.
; We now detect when it would be beneficial to replace
; anyext with signext.
define void @quux(i32 signext %arg, i32 signext %arg1) nounwind {
; RV64I-LABEL: quux:
; RV64I: # %bb.0: # %bb
; RV64I-NEXT: addi sp, sp, -32
; RV64I-NEXT: sd ra, 24(sp) # 8-byte Folded Spill
; RV64I-NEXT: sd s0, 16(sp) # 8-byte Folded Spill
; RV64I-NEXT: sd s1, 8(sp) # 8-byte Folded Spill
; RV64I-NEXT: beq a0, a1, .LBB0_3
; RV64I-NEXT: # %bb.1: # %bb2.preheader
; RV64I-NEXT: mv s0, a1
; RV64I-NEXT: mv s1, a0
; RV64I-NEXT: .LBB0_2: # %bb2
; RV64I-NEXT: # =>This Inner Loop Header: Depth=1
; RV64I-NEXT: call hoge@plt
; RV64I-NEXT: addiw s1, s1, 1
; RV64I-NEXT: bne s1, s0, .LBB0_2
; RV64I-NEXT: .LBB0_3: # %bb6
; RV64I-NEXT: ld ra, 24(sp) # 8-byte Folded Reload
; RV64I-NEXT: ld s0, 16(sp) # 8-byte Folded Reload
; RV64I-NEXT: ld s1, 8(sp) # 8-byte Folded Reload
; RV64I-NEXT: addi sp, sp, 32
; RV64I-NEXT: ret
bb:
%tmp = icmp eq i32 %arg, %arg1
br i1 %tmp, label %bb6, label %bb2
bb2: ; preds = %bb2, %bb
%tmp3 = phi i32 [ %tmp4, %bb2 ], [ %arg, %bb ]
tail call void @hoge()
%tmp4 = add nsw i32 %tmp3, 1
%tmp5 = icmp eq i32 %tmp4, %arg1
br i1 %tmp5, label %bb6, label %bb2
bb6: ; preds = %bb2, %bb
ret void
}
declare void @hoge()
; This ends up creating a shl with a i64 result type, but an i32 shift amount.
; Because custom type legalization for i32 is enabled, this resulted in
; LowerOperation being called for the amount. This was not expected and
; triggered an assert.
define i32 @crash(i32 %x, i32 %y, i32 %z) {
; RV64I-LABEL: crash:
; RV64I: # %bb.0:
; RV64I-NEXT: sext.w a0, a0
; RV64I-NEXT: seqz a3, a0
; RV64I-NEXT: addw a0, a1, a2
; RV64I-NEXT: slli a1, a3, 3
; RV64I-NEXT: .LBB1_1: # %bb
; RV64I-NEXT: # =>This Inner Loop Header: Depth=1
; RV64I-NEXT: beq a0, a1, .LBB1_1
; RV64I-NEXT: # %bb.2: # %bar
; RV64I-NEXT: ret
br label %bb
bb:
%a = icmp eq i32 %x, 0
%b = add i32 %y, %z
%c = select i1 %a, i32 8, i32 0
%d = icmp eq i32 %b, %c
br i1 %d, label %bb, label %bar
bar:
ret i32 %b
}
; We prefer to sign extend i32 constants for phis. The default behavior in
; SelectionDAGBuilder is zero extend. We have a target hook to override it.
define i64 @sext_phi_constants(i32 signext %c) {
; RV64I-LABEL: sext_phi_constants:
; RV64I: # %bb.0:
; RV64I-NEXT: li a1, -1
; RV64I-NEXT: bnez a0, .LBB2_2
; RV64I-NEXT: # %bb.1: # %iffalse
; RV64I-NEXT: li a1, -2
; RV64I-NEXT: .LBB2_2: # %merge
; RV64I-NEXT: slli a0, a1, 32
; RV64I-NEXT: srli a0, a0, 32
; RV64I-NEXT: ret
%a = icmp ne i32 %c, 0
br i1 %a, label %iftrue, label %iffalse
iftrue:
br label %merge
iffalse:
br label %merge
merge:
%b = phi i32 [-1, %iftrue], [-2, %iffalse]
%d = zext i32 %b to i64
ret i64 %d
}