mirror of
https://github.com/cirosantilli/linux-kernel-module-cheat.git
synced 2026-01-26 11:41:35 +01:00
47 lines
1.0 KiB
ArmAsm
47 lines
1.0 KiB
ArmAsm
/* https://github.com/cirosantilli/linux-kernel-module-cheat#vcvtrr */
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#include "common.h"
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ENTRY
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.data
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vcvtr_0: .float 1.25, 2.5, 3.75, 4.0
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vcvtr_expect_zero: .word 1, 2, 3, 4
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vcvtr_expect_plus_infinity: .word 2, 3, 4, 4
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.bss
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vcvtr_result_zero: .skip 0x10
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vcvtr_result_plus_infinity: .skip 0x10
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.text
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ldr r0, =vcvtr_0
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vld1.32 {q0}, [r0]
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/* zero */
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vmrs r0, fpscr
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orr r0, r0, (3 << 22)
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vmsr fpscr, r0
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vcvtr.u32.f32 q1, q0
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ldr r0, =vcvtr_result_zero
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vst1.32 {q1}, [r0]
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ASSERT_MEMCMP(
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vcvtr_result_zero,
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vcvtr_expect_zero,
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0x10
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)
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#if 0
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/* TODO why is this not working? Rounds to zero still. */
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/* plus infinity */
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vmrs r0, fpscr
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mov r1, 1
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bfi r0, r1, 22, 2
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vmsr fpscr, r0
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vcvtr.u32.f32 q1, q0
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ldr r0, =vcvtr_result_plus_infinity
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vst1.32 {q1}, [r0]
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ASSERT_MEMCMP(
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vcvtr_result_plus_infinity,
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vcvtr_expect_plus_infinity,
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0x10
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)
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#endif
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EXIT
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