llvm-6502/test/CodeGen/SystemZ/int-cmp-42.ll
Richard Sandiford 35c93e4e42 [SystemZ] Try reversing comparisons whose first operand is in memory
This allows us to make more use of the many compare reg,mem instructions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189099 91177308-0d34-0410-b5e6-96231b3b80d8
2013-08-23 11:27:19 +00:00

122 lines
2.6 KiB
LLVM

; Test 64-bit comparisons in which the second operand is zero-extended
; from a PC-relative i32.
;
; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
@g = global i32 1
@h = global i32 1, align 2, section "foo"
; Check unsigned comparison.
define i64 @f1(i64 %src1) {
; CHECK-LABEL: f1:
; CHECK: clgfrl %r2, g
; CHECK-NEXT: jl
; CHECK: br %r14
entry:
%val = load i32 *@g
%src2 = zext i32 %val to i64
%cond = icmp ult i64 %src1, %src2
br i1 %cond, label %exit, label %mulb
mulb:
%mul = mul i64 %src1, %src1
br label %exit
exit:
%res = phi i64 [ %src1, %entry ], [ %mul, %mulb ]
ret i64 %res
}
; Check signed comparison.
define i64 @f2(i64 %src1) {
; CHECK-LABEL: f2:
; CHECK-NOT: clgfrl
; CHECK: br %r14
entry:
%val = load i32 *@g
%src2 = zext i32 %val to i64
%cond = icmp slt i64 %src1, %src2
br i1 %cond, label %exit, label %mulb
mulb:
%mul = mul i64 %src1, %src1
br label %exit
exit:
%res = phi i64 [ %src1, %entry ], [ %mul, %mulb ]
ret i64 %res
}
; Check equality.
define i64 @f3(i64 %src1) {
; CHECK-LABEL: f3:
; CHECK: clgfrl %r2, g
; CHECK-NEXT: je
; CHECK: br %r14
entry:
%val = load i32 *@g
%src2 = zext i32 %val to i64
%cond = icmp eq i64 %src1, %src2
br i1 %cond, label %exit, label %mulb
mulb:
%mul = mul i64 %src1, %src1
br label %exit
exit:
%res = phi i64 [ %src1, %entry ], [ %mul, %mulb ]
ret i64 %res
}
; Check inequality.
define i64 @f4(i64 %src1) {
; CHECK-LABEL: f4:
; CHECK: clgfrl %r2, g
; CHECK-NEXT: jlh
; CHECK: br %r14
entry:
%val = load i32 *@g
%src2 = zext i32 %val to i64
%cond = icmp ne i64 %src1, %src2
br i1 %cond, label %exit, label %mulb
mulb:
%mul = mul i64 %src1, %src1
br label %exit
exit:
%res = phi i64 [ %src1, %entry ], [ %mul, %mulb ]
ret i64 %res
}
; Repeat f1 with an unaligned address.
define i64 @f5(i64 %src1) {
; CHECK-LABEL: f5:
; CHECK: larl [[REG:%r[0-5]]], h
; CHECK: clgf %r2, 0([[REG]])
; CHECK-NEXT: jl
; CHECK: br %r14
entry:
%val = load i32 *@h, align 2
%src2 = zext i32 %val to i64
%cond = icmp ult i64 %src1, %src2
br i1 %cond, label %exit, label %mulb
mulb:
%mul = mul i64 %src1, %src1
br label %exit
exit:
%res = phi i64 [ %src1, %entry ], [ %mul, %mulb ]
ret i64 %res
}
; Check the comparison can be reversed if that allows CLGFRL to be used.
define i64 @f6(i64 %src2) {
; CHECK-LABEL: f6:
; CHECK: clgfrl %r2, g
; CHECK-NEXT: jh {{\.L.*}}
; CHECK: br %r14
entry:
%val = load i32 *@g
%src1 = zext i32 %val to i64
%cond = icmp ult i64 %src1, %src2
br i1 %cond, label %exit, label %mulb
mulb:
%mul = mul i64 %src2, %src2
br label %exit
exit:
%res = phi i64 [ %src2, %entry ], [ %mul, %mulb ]
ret i64 %res
}