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llvm-project/llvm/test/MC/ARM/ldr-pseudo-cond-darwin.s

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[ARM] Support and tests for transform of LDR rt, = to MOV 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
2016-05-13 05:22:42 +08:00
@RUN: llvm-mc -triple armv7-base-apple-darwin %s | FileCheck --check-prefix=CHECK-ARM --check-prefix=CHECK %s
@RUN: llvm-mc -triple thumbv7-base-apple-darwin %s | FileCheck --check-prefix=CHECK-THUMB2 --check-prefix=CHECK %s
@
@ Check that ldr to constant pool correctly transfers the condition codes
@
@ simple test
.section __TEXT,a,regular,pure_instructions
@ CHECK-LABEL: f0:
f0:
it eq
ldreq r0, =0x10002
@ CHECK: ldreq r0, Ltmp0
@ loading multiple constants
.section __TEXT,b,regular,pure_instructions
@ CHECK-LABEL: f1:
f1:
ite eq
ldreq r0, =0x10003
@ CHECK: ldreq r0, Ltmp1
ldrne r0, =0x10004
@ CHECK: ldrne r0, Ltmp2
@ transformation to mov
.section __TEXT,d,regular,pure_instructions
@ CHECK-LABEL: f2:
f2:
@ Can use the narrow Thumb mov as it does not set flags in an IT block
it eq
ldreq r1, =0x1
@ CHECK: moveq r1, #1
@ Must use the wide Thumb mov if the constant can't be represented
ite eq
ldreq r2, = 0x1f000000
@ CHECK-ARM moveq r2, #520093696
@ CHECK-THUMB2 moveq.w r2, #520093696
ldrne r3, = 0x00001234
Fix some broken CHECK lines. The colon is important. llvm-svn: 292761
2017-01-23 04:28:56 +08:00
@ CHECK: movwne r3, #4660
[ARM] Support and tests for transform of LDR rt, = to MOV 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
2016-05-13 05:22:42 +08:00
@
@ Constant Pools
@
@ CHECK: .section __TEXT,a,regular,pure_instructions
@ CHECK: .p2align 2
@ CHECK: Ltmp0:
@ CHECK: .long 65538
@ CHECK: .section __TEXT,b,regular,pure_instructions
@ CHECK: .p2align 2
@ CHECK: Ltmp1:
@ CHECK: .long 65539
@ CHECK: Ltmp2:
@ CHECK: .long 65540