2015-01-21-thumbv4t-ldstr-opt.ll
1.47 KB
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; RUN: llc -mtriple=thumbv4t-none--eabi < %s | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-V4T
; RUN: llc -mtriple=thumbv6m-none--eabi < %s | FileCheck %s --check-prefix=CHECK --check-prefix=CHECK-V6M
; CHECK-LABEL: test1
define i32 @test1(i32* %p) {
; Offsets less than 8 can be generated in a single add
; CHECK: adds [[NEWBASE:r[0-9]]], r0, #4
%1 = getelementptr inbounds i32, i32* %p, i32 1
%2 = getelementptr inbounds i32, i32* %p, i32 2
%3 = getelementptr inbounds i32, i32* %p, i32 3
%4 = getelementptr inbounds i32, i32* %p, i32 4
; CHECK-NEXT: ldm [[NEWBASE]],
%5 = load i32, i32* %1, align 4
%6 = load i32, i32* %2, align 4
%7 = load i32, i32* %3, align 4
%8 = load i32, i32* %4, align 4
%9 = add nsw i32 %5, %6
%10 = add nsw i32 %9, %7
%11 = add nsw i32 %10, %8
ret i32 %11
}
; CHECK-LABEL: test2
define i32 @test2(i32* %p) {
; Offsets >=8 require a mov and an add
; CHECK-V4T: movs [[NEWBASE:r[0-9]]], r0
; CHECK-V6M: mov [[NEWBASE:r[0-9]]], r0
; CHECK-NEXT: adds [[NEWBASE]], #8
%1 = getelementptr inbounds i32, i32* %p, i32 2
%2 = getelementptr inbounds i32, i32* %p, i32 3
%3 = getelementptr inbounds i32, i32* %p, i32 4
%4 = getelementptr inbounds i32, i32* %p, i32 5
; CHECK-NEXT: ldm [[NEWBASE]],
%5 = load i32, i32* %1, align 4
%6 = load i32, i32* %2, align 4
%7 = load i32, i32* %3, align 4
%8 = load i32, i32* %4, align 4
%9 = add nsw i32 %5, %6
%10 = add nsw i32 %9, %7
%11 = add nsw i32 %10, %8
ret i32 %11
}