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With constant-sharing, litpool loads consume 4 + N*2 bytes of code, but movw/movt pairs consume 8*N. This means litpools are better than movw/movt even with just one use. Other materialisation strategies can still be better though, so the logic is a little odd. llvm-svn: 199891
58 lines
1.8 KiB
LLVM
58 lines
1.8 KiB
LLVM
; RUN: llc -mtriple=thumbv7m-macho -o - -show-mc-encoding %s | FileCheck %s
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; RUN: llc -mtriple=thumbv6m-macho -o - -show-mc-encoding %s | FileCheck %s --check-prefix=CHECK-V6M
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; RUN: llc -mtriple=armv6-macho -o - -show-mc-encoding %s | FileCheck %s --check-prefix=CHECK-ARM
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define i32 @test_mov() minsize {
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; CHECK-LABEL: test_mov:
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; CHECK: movs r0, #255 @ encoding: [0xff,0x20]
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ret i32 255
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}
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define i32 @test_mov_mvn() minsize {
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; CHECK-LABEL: test_mov_mvn:
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; CHECK: mvn r0, #203 @ encoding: [0x6f,0xf0,0xcb,0x00]
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; CHECK-V6M-LABEL: test_mov_mvn:
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; CHECK-V6M: movs [[TMP:r[0-7]]], #203 @ encoding: [0xcb,0x20]
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; CHECK-V6M: mvns r0, [[TMP]] @ encoding: [0xc0,0x43]
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; CHECK-ARM-LABEL: test_mov_mvn:
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; CHECK-ARM: mvn r0, #203 @ encoding: [0xcb,0x00,0xe0,0xe3]
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ret i32 4294967092
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}
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define i32 @test_mov_lsl() minsize {
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; CHECK-LABEL: test_mov_lsl:
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; CHECK: mov.w r0, #589824 @ encoding: [0x4f,0xf4,0x10,0x20]
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; CHECK-V6M-LABEL: test_mov_lsl:
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; CHECK-V6M: movs [[TMP:r[0-7]]], #9 @ encoding: [0x09,0x20]
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; CHECK-V6M: lsls r0, [[TMP]], #16 @ encoding: [0x00,0x04]
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; CHECK-ARM-LABEL: test_mov_lsl:
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; CHECK-ARM: mov r0, #589824 @ encoding: [0x09,0x08,0xa0,0xe3]
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ret i32 589824
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}
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define i32 @test_movw() minsize {
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; CHECK-LABEL: test_movw:
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; CHECK: movw r0, #65535
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; CHECK-V6M-LABEL: test_movw:
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; CHECK-V6M: ldr r0, [[CONSTPOOL:LCPI[0-9]+_[0-9]+]] @ encoding: [A,0x48]
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; CHECK-V6M: [[CONSTPOOL]]:
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; CHECK-V6M-NEXT: .long 65535
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; CHECK-ARM-LABEL: test_movw:
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; CHECK-ARM: mov r0, #255 @ encoding: [0xff,0x00,0xa0,0xe3]
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; CHECK-ARM: orr r0, r0, #65280 @ encoding: [0xff,0x0c,0x80,0xe3]
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ret i32 65535
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}
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define i32 @test_regress1() {
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; CHECK-ARM-LABEL: test_regress1:
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; CHECK-ARM: mov r0, #248 @ encoding: [0xf8,0x00,0xa0,0xe3]
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; CHECK-ARM: orr r0, r0, #16252928 @ encoding: [0x3e,0x07,0x80,0xe3]
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ret i32 16253176
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}
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