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fa6e1c461b
This change implements the transformation in processInstruction() for the LDR rt, =expression to MOV rt, expression when the expression can be evaluated and can fit into the immediate field of the MOV or a MVN. Across the ARM and Thumb instruction sets there are several cases to consider, each with a different range of representatble constants. In ARM we have: * Modified immediate (All ARM architectures) * MOVW (v6t2 and above) In Thumb we have: * Modified immediate (v6t2, v7m and v8m.mainline) * MOVW (v6t2, v7m, v8.mainline and v8m.baseline) * Narrow Thumb MOV that can be used in an IT block (non flag-setting) If the immediate fits any of the available alternatives then we make the transformation. Fixes 25722. Patch by Peter Smith. llvm-svn: 269354
56 lines
1.3 KiB
ArmAsm
56 lines
1.3 KiB
ArmAsm
@RUN: llvm-mc -triple armv7-unknown-linux-gnueabi %s | FileCheck --check-prefix=CHECK-ARM --check-prefix=CHECK %s
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@RUN: llvm-mc -triple thumbv7-unknown-linux-gnueabi %s | FileCheck --check-prefix=CHECK-THUMB2 --check-prefix=CHECK %s
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@
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@ Check that ldr to constant pool correctly transfers the condition codes
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@
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@ simple test
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.section a,"ax",%progbits
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@ CHECK-LABEL: f0:
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f0:
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it eq
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ldreq r0, =0x10002
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@ CHECK: ldreq r0, .Ltmp[[TMP0:[0-9]+]]
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@ loading multiple constants
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.section b,"ax",%progbits
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@ CHECK-LABEL: f1:
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f1:
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ite eq
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ldreq r0, =0x10003
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@ CHECK: ldreq r0, .Ltmp[[TMP1:[0-9]+]]
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ldrne r0, =0x10004
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@ CHECK: ldrne r0, .Ltmp[[TMP2:[0-9]+]]
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@ transformation to mov
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.section c, "ax", %progbits
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@ CHECK-LABEL: f2:
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f2:
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@ Can use the narrow Thumb mov as it does not set flags in an IT block
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it eq
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ldreq r1, =0x1
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@ CHECK: moveq r1, #1
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@ Must use the wide Thumb mov if the constant can't be represented
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ite eq
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ldreq r2, = 0x1f000000
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@ CHECK-ARM moveq r2, #520093696
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@ CHECK-THUMB2 moveq.w r2, #520093696
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ldrne r3, = 0x00001234
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@ CHECK movwne r2, #4660
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@
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@ Constant Pools
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@
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@ CHECK: .section a,"ax",%progbits
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@ CHECK: .p2align 2
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@ CHECK: .Ltmp[[TMP0]]
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@ CHECK: .long 65538
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@ CHECK: .section b,"ax",%progbits
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@ CHECK: .p2align 2
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@ CHECK: .Ltmp[[TMP1]]
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@ CHECK: .long 65539
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@ CHECK: .Ltmp[[TMP2]]
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@ CHECK: .long 65540
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